bitsilly
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| posted on 2/1/07 at 05:46 PM |
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Carbed R1 engine, cuts out!
We are gradually getting our car sorted but three times now when starting to go up a hill from standing the engine has bogged down and lost all torque
then coughs and stalls. I admit we couldn't give it much welly, as you stop at the end of our road on a steep incline, and turn left on gravel
up the steep hill. When it happens you can slip the clutch but the engine won't recover until it has been stopped and restarted.
Only other info is it starts from cold w/o choke so I guess is running rich (were told this is the best thing for it for track days??).
I admit it is early days re driving it as we have had it off the road almost since buying it but if from the above there sounds like theres an obvious
solution please could you let me know.
Cheers
Ed
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Wadders
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| posted on 2/1/07 at 05:56 PM |
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Running a bit rich at full throttle is a better proposition than running lean, but if its so rich its cutting out during normal driving thats
something else. Are you positive it is running rich? next time it dies whip a plug out and check the colour. could be a fuel starvation problem. are
you sure the chokes not stuck open? Is the motor fully warm when you try driving it?
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bitsilly
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| posted on 2/1/07 at 06:58 PM |
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There is no choke cable on it, last owner said he would hold it open manually while starting it but as I said it starts from cold without doing this.
The choke lever returns when let go.
As it starts w/o choke and I was told it was set up rich I guess it is rich but don't know how much.
Yes engine is warm by then. Forgot to mention that usually once warm the revs jump as if the throttle is stuck open and only sometimes drop down
again.
Sorry once again if all this sounds stupid but its my first foray into bike engines and have no benchmark.
I guess its a visit to to the local bike shop!
Oh yes, plugs look OK, a bit sooty/black but not too bad.
Clear petrol filter in engine bay looks full once ignition is on.
Cheers
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the_fbi
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| posted on 2/1/07 at 07:01 PM |
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What fuel pump/system do you have between the tank and the carbs?
IS it possible that due to the angle of the carbs/filters there could be air trapped in the system and it takes the restart (pump running but engine
not) in order for the fuel to purge the float chambers again?
Depending on the hill, due to the orientation of the engine in a car, going up a hill would be like leaning a bike over on a (very) hard corner,
except there are no g-forces on the carbs/fuel in the car scenario, but there is on a bike.
Just an idea.
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the_fbi
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| posted on 2/1/07 at 07:02 PM |
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quote:
Originally posted by bitsilly
Clear petrol filter in engine bay looks full once ignition is on.
Filter empties when the ignition is off? Hmmm...
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bitsilly
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| posted on 2/1/07 at 07:16 PM |
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Good points. I have been told the car did 135mph at brands hatch so presumed the petrol pump was sufficient but there is no return (ie not high
pressure??) and it looks like a small standard SU pump. Filter does empty but looks higher than tank and so is gravity assisted. Will check next time
before restarting.
Thanks, nice one.
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the_fbi
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| posted on 2/1/07 at 07:25 PM |
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Got a normal carb'd Mitsubishi pump on mine, under the tank, with a filter just before the carbs, mine never empties even after days. May be
nothing...
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esn163
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| posted on 2/1/07 at 07:33 PM |
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Hi
May not be related, but your symptoms sound very similar to our blades when the rectifier was playing up
(here and
here). Ie when under load, revs die but when restarted it was possible to drive
the car a small distance before happening again.
May not be rectifier however as I've not heard of R1s having rectifier problems but may be worth a check of wiring if you are still struggling
to find the problem after checking fueling etc.
Tested ours by watching battery voltage with the engine running in neutral at different revs. Should be charging below 15V IIRC on the blade (ours was
reading 16.8 at tickover).
Anyway may worth a check if fueling seems OK.
HTH
Ed
[Edited on 2/1/07 by esn163]
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bitsilly
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| posted on 2/1/07 at 08:00 PM |
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Cheers Ed
The car runs fine on the flat but I'll keep it in mind.
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