piece on the back of the CDM Carb is the anti Diesel valve.
Bike Carbs On Ew Engine, Need Advice.
#31
Posted 13 July 2013 - 10:17 AM
#32
Posted 13 July 2013 - 12:43 PM
Thanks guys! I need all the support now as I'm not entirely sure what I'm doing
Yea air filters are coming off for now. The main problem at the moment is that it doesn't seem to get any fuel through, gauge on the fuel pressure reg stays on 0, there seem to be fuel going into the regulator, not sure about past it, haven't checked... I might just bypass it for now and have the fuel line going from the top so like it would be a bit gravity fed...
#33
Posted 15 July 2013 - 05:48 AM
#34
Posted 15 July 2013 - 09:46 AM
That's a mechanical fuel pump, it only works when the cam is turning... It should be fine for the bike carbs...
And make sure your reg is actually open, sometimes those screws are tricky, like I think screwed in is open, kind of backwards from what one would think.
#35
Posted 15 July 2013 - 09:50 AM
I'll double check the reg anyway, but I'm pretty sure that the screw undone means wide open, at least that's what manual said I think... Also someone suggested that if the fuel pressure gauge shows no pressure it doesn't necessary have to mean that there's no fuel coming through, is that correct? When would it show pressure reading then?
#36
Posted 15 July 2013 - 09:52 AM
In this case, I would also suggest an inline electric pump with aftermarket filter, adjustable pressure regulator, and pressure gauge. You'll want the ability to make as many adjustments as possible. You're going to need to find out what fuel pressure the carbs require (I would guess 3-5psi), and ditch the factory pump altogether.
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#37
Posted 15 July 2013 - 12:01 PM
Stock pump is in the 5 to 7 psi range. I would remove the regulator and make sure the pump is pumping, get it running and check fuel mixture with wide band. Good chance its close to the needed fuel pressure already.
#38
Posted 15 July 2013 - 01:03 PM
the pdf article posted about puting bike carbs on vintage fords seemed to say no more than 3psi for bike carbs.
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#39
Posted 16 July 2013 - 08:48 AM
I thought the stock mech pump was ~3 psi... It should show a pressure reading after the motor has been cranked for a few seconds, so that the pump can get juice in the system. It may take a few tries, as the system has to push some air out, since you had it opened up...
#40
Posted 16 July 2013 - 10:02 AM
I will post a video soon
Thanks for help and I'll keep you posted!
#41
Posted 16 July 2013 - 05:54 PM
#42
Posted 17 July 2013 - 07:31 AM
#43
Posted 20 July 2013 - 01:30 PM
Ok, so I got it to start and idle nicely now, everything except vacuum for brakes is hooked up (that's not a problem). It idles very nice I think, it starts up even better then on stock carb I think. The problem seems to be fuelling now... it cut's out and won't rev past 2000-3000rpm with AFR dropping down to sub 18:1 when I push throttle quickly and especially on WOT. The choke is awesome when the engine is cold but when it's nice and warm it cuts the engine off so no luck there either... When I press throttle gently (up to about 1/4 of entire scale) it will rev up nicely with healthy AFR... Also as you can see, fuel pressure gauge shows nothing all the time and it runs exactly the same if I close it down or open it all the way up.
Has anyone got any clues what could that be? I don't think it's jetting because carbs seem to be capable of getting enough fuel through...
Please help if you can.
#44
Posted 20 July 2013 - 04:27 PM
#45
Posted 20 July 2013 - 09:34 PM
- rollz87civic likes this