Hi,
I have bought a set of R1 carbs from DanSt. I have problems with the setup. When the eninge goes up to 2500-3000 rpm i starts banging and won´t rev
up.
The main jets are 1,8 and the needles are as the following picture.
Fuel pressure about 1 psi.
https://www.youtube.com/watch?v=yrZ42uyj_Y8
Anybody who can tell me their setup? Needleheight, how many turns with the pilotscrews, etc etc.
Thanks!
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First thing, Fuel pressure should be about 2.5psi
Hi,
1psi might be a bit low, although unloaded I wouldn't expect this to be an issue. Banging and lack of revs sounds like it is running out of fuel,
or an ignition issue - what ignition set up are you using? Again needle heights should not affect unloaded revving so at this stage I would not spend
too much time playing with this.
On the other hand, 1.8 is quite a large main jet, but again I do not think this is your issue.
It would also be worth removing the float bowls and checking that all four float valves are free to move in their housing/seat. If the carbs have been
stood for some time without fuel these can stick either open (carbs would flood on idle) or shut (which might explain a lack of fuel). We do our best
to prevent this but it is an unfortunate affliction of unused carbs.
quote:
Originally posted by FASTdan
Hi,
1psi might be a bit low, although unloaded I wouldn't expect this to be an issue. Banging and lack of revs sounds like it is running out of fuel, or an ignition issue - what ignition set up are you using? Again needle heights should not affect unloaded revving so at this stage I would not spend too much time playing with this.
On the other hand, 1.8 is quite a large main jet, but again I do not think this is your issue.
It would also be worth removing the float bowls and checking that all four float valves are free to move in their housing/seat. If the carbs have been stood for some time without fuel these can stick either open (carbs would flood on idle) or shut (which might explain a lack of fuel). We do our best to prevent this but it is an unfortunate affliction of unused carbs.
I had the same when setting my cbr carbs up
Spoke to bogg bros who advised me to open the jet up to 1.9 and try it as theyve known zetecs to run on 2+
Ide started at 1.7 and bought some micro drills to take them out bit by bit
This diagram may help you to understand the relationship between jet, needle, clip etc.
http://i750.photobucket.com/albums/xx141/snapperpaul/C2874EA2-CE95-4CF2-A262-FF7C7A034AF8-532-0000009CAB3228F2.jpg
[Edited on 23/3/15 by snapper]
[Edited on 23/3/15 by snapper]
quote:
Originally posted by snapper
This diagram may help you to understand the relationship between jet, needle, clip etc.
http://i750.photobucket.com/albums/xx141/snapperpaul/C2874EA2-CE95-4CF2-A262-FF7C7A034AF8-532-0000009CAB3228F2.jpg
[Edited on 23/3/15 by snapper]
[Edited on 23/3/15 by snapper]
My standard 2 litre Black Top runs R1 carbs on a DanSt manifold, Fitted with Weber dgv 180 mains and air correction @ .075, making 165 on the rollers.
Fuel pressure is set at 2.5 psi. 64 ft, = 2.1 secs.....p.c,just re read your post and you have air at 1.7, sounds like it is running far too weak,
mine is .075. We filled the holes with 2-part filler and started at .5 mm the finished at .75
[Edited on 23/3/15 by redturner]
[Edited on 23/3/15 by redturner]
I would say start with basics are carbs ballanced, what fuel system are you using, pump/regulator/ignition? if getting fuel level/bowls full
doesn't sound like pressure to much a problem as only on light load, and then adjust air screws for a good tickover and old school, check plugs.
Or ideal just a narrow band sensor a start
if all above ok I'm going for option more rich than lean
I have now checked the cams. They are not in sync. Could that be the possible reason => Not correct timing => missing sparks?
Where abouts are you? Can we offer out services?
www.facebook.com/baileyperformance
www.baileyperformance.co.uk
Did you have it running before fitting the carbs? And are the cams standard Or not as could be timed different
quote:
Originally posted by BaileyPerformance
Where abouts are you? Can we offer out services?
www.facebook.com/baileyperformance
www.baileyperformance.co.uk
quote:
Originally posted by will121
Did you have it running before fitting the carbs? And are the cams standard Or not as could be timed different