Carb Sync - Megablade RRV (Pilot Screw Adjustment)

[tobytuk]

My first post as I've just bought myself a Megablade still to be SVA'd hopefully over the winter.

I've just  bought a Carbtune Pro balancing kit to try and Sync the carbs myself. Engine is out of a '97 RRV (919cc) with upgraded main jets to 140 and a Foam (westfield ) air filter .  I dismantled the carbs , cleaned everything thoroughly , renewed the rubber gaskets etc and got the car running again , albeit it's a bit rough from idle up to ~3.5k revs, so hopefully the carb sync will cure the rough idling.

However I removed the pilot screws completely during he cleaning process (also to renew the small rubber 'O' ring) but I forgot to note their settings prior to the carbs being dismantled. I cannot see any reference on adjusting these screws in the syncing process - surely their proper adjustment is critical to smooth running at idle in addition to adjusting the vacuum via the carb sync screws ?

Can anyone advise me on how I adjust the settings on the pilot screws ?

Thx          

[tobytuk]

tobytuk wrote:

My first post as I've just bought myself a Megablade still to be SVA'd hopefully over the winter.

I've just  bought a Carbtune Pro balancing kit to try and Sync the carbs myself. Engine is out of a '97 RRV (919cc) with upgraded main jets to 140 and a Foam (westfield ) air filter .  I dismantled the carbs , cleaned everything thoroughly , renewed the rubber gaskets etc and got the car running again , albeit it's a bit rough from idle up to ~3.5k revs, so hopefully the carb sync will cure the rough idling.

However I removed the pilot screws completely during he cleaning process (also to renew the small rubber 'O' ring) but I forgot to note their settings prior to the carbs being dismantled. I cannot see any reference on adjusting these screws in the syncing process - surely their proper adjustment is critical to smooth running at idle in addition to adjusting the vacuum via the carb sync screws ?

Can anyone advise me on how I adjust the settings on the pilot screws ?

Thx          

Well ,  after being inundated with advice , I've  had to try adjust the pilot screw at various settings to find out for myself what the optimum setting is.  For the benefit of any one else trying this for themself , the Carb Tune Pro is a neat piece of kit (~£55) which came with very comprehensive instructions (google it or try eBay).

I first removed the 3 small hex screws from each of the carb intake ports and inserted 3 of the (5mm) plastic adapters that came with the Carb tune kit in their place. You need small fingers for this job since you are working below the carbs in a confined space with all sorts of hoses and wires getting in your way. I had to use a  stubby flat headed screw driver to locate the plastic adapters despite the fact that the instructions say to use your finger pressure only to locate them. Nos 3 intake port already had a brass adapter in place and it was a simple matter to detach the vacum hose already attached here and then attaching the 4 rubber hoses from the Carb Tune manometer to each of the adapters/ intake ports. Port /cylinder Nos 3 is the reference port to which the other 3 vacuum readings on the manometer must equate to.  

I had to remove the foam filter and its mounting plate as it's impossible to get access to the vacuum adjustment screws without doing this .

I started off with each of the pilot screws being wound out by 3 turns at which setting it was  impossible to get the equal vacuum readings on the gauges. I proceeded to turn each pilot screw in by 1/2 turn at a time and tried to adjust the vacuum screws to get equal readings on the gauges. The optimim setting for my engine was eventually found @ 1 3/4 turn out @ 1k revs idle at which all 4 gauges read 22 cmHg....Hey result !!!   FYI - the absolute value of the readings are irrelevant, only that  the readings are all equal.


Overall a fairly easy job if you take you time. It took me about an 1.5 hours including setting up the Carb tune manometer which required cutting hoses to size and fitting restrictor tubes. It would have been a 30 min job if I hadn't had to mess about with the 'suck it an see' pilot screw adjustment in conjunction with the vacuum adjustment screws - and definitely worth it when I hear how sweetly the engine is running now.

Cheers, Toby    

[bbird23uk]

Good to hear you cracked it, and of course all the more satisfying for doing it on your own (!) Sorry for not replying earlier but every bike I've ever owned has them set at 1 1/2 to 1 3/4 out (as std) and I doubt the Fireblade would be any different.
Best of luck with the SVA!
Steve H.
  ----- Original Message -----
  From: tobytuk
  To: bike-engined-cars@...
  Sent: Thursday, October 15, 2009 8:43 PM
  Subject: Re: [bike-engined-cars] Carb Sync - Megablade RRV (Pilot Screw Adjustment)


   

  tobytuk wrote:
  >
  > My first post as I've just bought myself a Megablade still to be SVA'd
  > hopefully over the winter.
  >
  > I've just bought a Carbtune Pro balancing kit to try and Sync the carbs
  > myself. Engine is out of a '97 RRV (919cc) with upgraded main jets to 140
  > and a Foam (westfield ) air filter . I dismantled the carbs , cleaned
  > everything thoroughly , renewed the rubber gaskets etc and got the car
  > running again , albeit it's a bit rough from idle up to ~3.5k revs, so
  > hopefully the carb sync will cure the rough idling.
  >
  > However I removed the pilot screws completely during he cleaning process
  > (also to renew the small rubber 'O' ring) but I forgot to note their
  > settings prior to the carbs being dismantled. I cannot see any reference
  > on adjusting these screws in the syncing process - surely their proper
  > adjustment is critical to smooth running at idle in addition to adjusting
  > the vacuum via the carb sync screws ?
  >
  > Can anyone advise me on how I adjust the settings on the pilot screws ?
  >
  > Thx
  >

  Well , after being inundated with advice , I've had to try adjust the
  pilot screw at various settings to find out for myself what the optimum
  setting is. For the benefit of any one else trying this for themself , the
  Carb Tune Pro is a neat piece of kit (~£55) which came with very
  comprehensive instructions (google it or try eBay).

  I first removed the 3 small hex screws from each of the carb intake ports
  and inserted 3 of the (5mm) plastic adapters that came with the Carb tune
  kit in their place. You need small fingers for this job since you are
  working below the carbs in a confined space with all sorts of hoses and
  wires getting in your way. I had to use a stubby flat headed screw driver
  to locate the plastic adapters despite the fact that the instructions say to
  use your finger pressure only to locate them. Nos 3 intake port already had
  a brass adapter in place and it was a simple matter to detach the vacum hose
  already attached here and then attaching the 4 rubber hoses from the Carb
  Tune manometer to each of the adapters/ intake ports. Port /cylinder Nos 3
  is the reference port to which the other 3 vacuum readings on the manometer
  must equate to.

  I had to remove the foam filter and its mounting plate as it's impossible to
  get access to the vacuum adjustment screws without doing this .

  I started off with each of the pilot screws being wound out by 3 turns at
  which setting it was impossible to get the equal vacuum readings on the
  gauges. I proceeded to turn each pilot screw in by 1/2 turn at a time and
  tried to adjust the vacuum screws to get equal readings on the gauges. The
  optimim setting for my engine was eventually found @ 1 3/4 turn out @ 1k
  revs idle at which all 4 gauges read 22 cmHg....Hey result !!! FYI - the
  absolute value of the readings are irrelevant, only that the readings are
  all equal.

  Overall a fairly easy job if you take you time. It took me about an 1.5
  hours including setting up the Carb tune manometer which required cutting
  hoses to size and fitting restrictor tubes. It would have been a 30 min job
  if I hadn't had to mess about with the 'suck it an see' pilot screw
  adjustment in conjunction with the vacuum adjustment screws - and definitely
  worth it when I hear how sweetly the engine is running now.

  Cheers, Toby
  --
  View this message in context: http://www.nabble.com/Carb-Sync---Megablade-RRV-%28Pilot-Screw-Adjustment%29-tp25898905p25914823.html
  Sent from the Yahoo BEC list - Bike Engined Cars mailing list archive at Nabble.com.



 

[Non-text portions of this message have been removed]

[tobytuk]

Hey Steve – thx , but having never owned a bike , I wouldn’t know !!
 
And yes very satisfying to have sussed it out by myself and getting the engine running as sweet as a nut.
 
I now need to sort out an exhaust that will pass post ’95 SVA emission( and noise  ) regs for bike engine... and that job might be a bit tougher and more expensive than sorting out the carbs.  
 
Cheers
 
 
From: bike-engined-cars@... [mailto:bike-engined-cars@...] On Behalf Of STEPHEN HANDLEY
Sent: 16 October 2009 18:24
To: bike-engined-cars@...
Subject: Re: [bike-engined-cars] Carb Sync - Megablade RRV (Pilot Screw Adjustment)
 
 
Good to hear you cracked it, and of course all the more satisfying for doing it on your own (!) Sorry for not replying earlier but every bike I've ever owned has them set at 1 1/2 to 1 3/4 out (as std) and I doubt the Fireblade would be any different.
Best of luck with the SVA!
Steve H.
----- Original Message -----
From: tobytuk
To: bike-engined-cars@... <mailto:bike-engined-cars%40yahoogroups.co.uk>  
Sent: Thursday, October 15, 2009 8:43 PM
Subject: Re: [bike-engined-cars] Carb Sync - Megablade RRV (Pilot Screw Adjustment)

tobytuk wrote:

>
> My first post as I've just bought myself a Megablade still to be SVA'd
> hopefully over the winter.
>
> I've just bought a Carbtune Pro balancing kit to try and Sync the carbs
> myself. Engine is out of a '97 RRV (919cc) with upgraded main jets to 140
> and a Foam (westfield ) air filter . I dismantled the carbs , cleaned
> everything thoroughly , renewed the rubber gaskets etc and got the car
> running again , albeit it's a bit rough from idle up to ~3.5k revs, so
> hopefully the carb sync will cure the rough idling.
>
> However I removed the pilot screws completely during he cleaning process
> (also to renew the small rubber 'O' ring) but I forgot to note their
> settings prior to the carbs being dismantled. I cannot see any reference
> on adjusting these screws in the syncing process - surely their proper
> adjustment is critical to smooth running at idle in addition to adjusting
> the vacuum via the carb sync screws ?
>
> Can anyone advise me on how I adjust the settings on the pilot screws ?
>
> Thx
>

Well , after being inundated with advice , I've had to try adjust the
pilot screw at various settings to find out for myself what the optimum
setting is. For the benefit of any one else trying this for themself , the
Carb Tune Pro is a neat piece of kit (~£55) which came with very
comprehensive instructions (google it or try eBay).

I first removed the 3 small hex screws from each of the carb intake ports
and inserted 3 of the (5mm) plastic adapters that came with the Carb tune
kit in their place. You need small fingers for this job since you are
working below the carbs in a confined space with all sorts of hoses and
wires getting in your way. I had to use a stubby flat headed screw driver
to locate the plastic adapters despite the fact that the instructions say to
use your finger pressure only to locate them. Nos 3 intake port already had
a brass adapter in place and it was a simple matter to detach the vacum hose
already attached here and then attaching the 4 rubber hoses from the Carb
Tune manometer to each of the adapters/ intake ports. Port /cylinder Nos 3
is the reference port to which the other 3 vacuum readings on the manometer
must equate to.

I had to remove the foam filter and its mounting plate as it's impossible to
get access to the vacuum adjustment screws without doing this .

I started off with each of the pilot screws being wound out by 3 turns at
which setting it was impossible to get the equal vacuum readings on the
gauges. I proceeded to turn each pilot screw in by 1/2 turn at a time and
tried to adjust the vacuum screws to get equal readings on the gauges. The
optimim setting for my engine was eventually found @ 1 3/4 turn out @ 1k
revs idle at which all 4 gauges read 22 cmHg....Hey result !!! FYI - the
absolute value of the readings are irrelevant, only that the readings are
all equal.

Overall a fairly easy job if you take you time. It took me about an 1.5
hours including setting up the Carb tune manometer which required cutting
hoses to size and fitting restrictor tubes. It would have been a 30 min job
if I hadn't had to mess about with the 'suck it an see' pilot screw
adjustment in conjunction with the vacuum adjustment screws - and definitely
worth it when I hear how sweetly the engine is running now.

Cheers, Toby
--
View this message in context: http://www.nabble.com/Carb-Sync---Megablade-RRV-%28Pilot-Screw-Adjustment%29-tp25898905p25914823.html
Sent from the Yahoo BEC list - Bike Engined Cars mailing list archive at Nabble.com.

[Non-text portions of this message have been removed]

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.421 / Virus Database: 270.14.20/2440 - Release Date: 10/16/09 06:32:00


[Non-text portions of this message have been removed]

[Simon Hargrave-55]

Wont you have to iva it now not sva?  Not sure if emissions are different but as you are referring to sva not iva i wonder if youve considered reverse gear rules etc?

-----Original Message-----
From: Dave Todd <davey.todd@...>
Sent: Saturday, October 17, 2009 8:35
To: bike-engined-cars@...
Subject: RE: [bike-engined-cars] Carb Sync - Megablade RRV (Pilot Screw Adjustment)

 
Hey Steve – thx , but having never owned a bike , I wouldn’t know !!

 And yes very satisfying to have sussed it out by myself and getting the engine running as sweet as a nut.

 I now need to sort out an exhaust that will pass post ’95 SVA emission( and noise ) regs for bike engine... and that job might be a bit tougher and more expensive than sorting out the carbs.

 Cheers


 From: bike-engined-cars@... [mailto:bike-engined-cars@...] On Behalf Of STEPHEN HANDLEY
 Sent: 16 October 2009 18:24
 To: bike-engined-cars@...
 Subject: Re: [bike-engined-cars] Carb Sync - Megablade RRV (Pilot Screw Adjustment)


 Good to hear you cracked it, and of course all the more satisfying for doing it on your own (!) Sorry for not replying earlier but every bike I've ever owned has them set at 1 1/2 to 1 3/4 out (as std) and I doubt the Fireblade would be any different.
 Best of luck with the SVA!
 Steve H.
 ----- Original Message -----
 From: tobytuk
 To: bike-engined-cars@... <mailto:bike-engined-cars%40y

[The entire original message is not included]

[Non-text portions of this message have been removed]

[tobytuk]

Hi- Yes , Sorry I meant IVA.
I not sure, but I don’t think the emissions regs have changed . I do have a WF reverse box with a warning lamp when reverse is engaged , so hopefully ok on this
 
Cheers
 
From: bike-engined-cars@... [mailto:bike-engined-cars@...] On Behalf Of Simon Hargrave
Sent: 17 October 2009 09:32
To: bike-engined-cars@...
Subject: RE: [bike-engined-cars] Carb Sync - Megablade RRV (Pilot Screw Adjustment)
 
 
Wont you have to iva it now not sva? Not sure if emissions are different but as you are referring to sva not iva i wonder if youve considered reverse gear rules etc?

-----Original Message-----
From: Dave Todd <davey.todd@... <mailto:davey.todd%40yahoo.co.uk> >
Sent: Saturday, October 17, 2009 8:35
To: bike-engined-cars@... <mailto:bike-engined-cars%40yahoogroups.co.uk>
Subject: RE: [bike-engined-cars] Carb Sync - Megablade RRV (Pilot Screw Adjustment)

Hey Steve – thx , but having never owned a bike , I wouldn’t know !!

And yes very satisfying to have sussed it out by myself and getting the engine running as sweet as a nut.

I now need to sort out an exhaust that will pass post ’95 SVA emission( and noise ) regs for bike engine... and that job might be a bit tougher and more expensive than sorting out the carbs.

Cheers

From: bike-engined-cars@... <mailto:bike-engined-cars%40yahoogroups.co.uk>  [mailto:bike-engined-cars@... <mailto:bike-engined-cars%40yahoogroups.co.uk> ] On Behalf Of STEPHEN HANDLEY
Sent: 16 October 2009 18:24
To: bike-engined-cars@... <mailto:bike-engined-cars%40yahoogroups.co.uk>
Subject: Re: [bike-engined-cars] Carb Sync - Megablade RRV (Pilot Screw Adjustment)

Good to hear you cracked it, and of course all the more satisfying for doing it on your own (!) Sorry for not replying earlier but every bike I've ever owned has them set at 1 1/2 to 1 3/4 out (as std) and I doubt the Fireblade would be any different.
Best of luck with the SVA!
Steve H.
----- Original Message -----
From: tobytuk
To: bike-engined-cars@... <mailto:bike-engined-cars%40yahoogroups.co.uk>  <mailto:bike-engined-cars%40y

[The entire original message is not included]

[Non-text portions of this message have been removed]

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.422 / Virus Database: 270.14.20/2441 - Release Date: 10/16/09 18:39:00


[Non-text portions of this message have been removed]