jossey
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| posted on 18/10/10 at 11:47 AM |
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Bike engine running problems zzr1100 c model
Here is my issue.
I have fully installed the bike engine.
but now its all wired up.
it runs awful.
There is a few issues which may not help it run right.
there is a 2cm x 1 cm hole in manifold of exhaust.
i dont have a air filter box to put on the carbs.
the engine hasnt been run for years.
it starts up first time now. but stalls as soon as you let go of the throttle.
if you rev it hard it cuts out after about 3000 rpms i cant get it to run on its own at all.
let go of the throttle cable and it dies.
im going to patch the exhaust for now until i can get a new one built.
where should i start with sorting this issue.
the fuel pump works fine and the fuel is clean and the fuel filter is new.
help if you will please?
Cheers
Dave J
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whitestu
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| posted on 18/10/10 at 11:54 AM |
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If bike carbs are left with fuel in the jets gum up and it won't run properly.
If you haven't done so already strip and thoroughly clean them. Some of the jets are very small and can look like they don't have a hole
in them at all until they have been cleaned.
Stu
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Guinness
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| posted on 18/10/10 at 11:57 AM |
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Pleased it's running, which is a major milestone.
Have you found the idle speed adjuster. Should look like a short section of bicycle brake cable with a black nob on the end. Should be hanging loose
from the bottom middle of the carbs. Hold the cable in one hand and rotate the knob. Should bring the idle speed up.
Are you starting it with the enrichment plunger (choke) in or out?
Mine will rev to around 3000 if I pull that fully out from cold. Sounds like it's not getting fuel past the main jets. Can you operate the
thottle while looking into the throats of the carbs? Are all the butterfly's opening? Are the sliders free in the carbs?
Hope that helps
Mike
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matt_gsxr
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| posted on 18/10/10 at 12:01 PM |
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Sounds like you are getting there.
Can you adjust the throttle stop so that it will idle (at 2krpm is fine)?
Is it running on 2 or 4. (header temperature will give this away).
Once idling you want to balance the carbs (always a problem on bike engines).
Sounds like you are getting there.
At 3k RPM what is happening? too much fuel (black smoke, black plugs), too little fuel (not black plugs), or no sparks (easily detected using the
timing light).
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daviep
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| posted on 18/10/10 at 12:01 PM |
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First thing I would do is get the carbs balanced and an air box fitted.
Mine runs horrendously without the airbox, sprays fuel out the carbs, pops and bangs and won't rev past 4000rpm, put the airbox on and it revs
cleanly and pulls like a train.
Unfortunately the airbox is massive  at the moment mine is sticking out the bonnet, looks very crap.
Davie
“A truly great library contains something in it to offend everyone.”
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jossey
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| posted on 18/10/10 at 12:45 PM |
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guys thank you for the quick replies.
ye im well happy it starts :O)
i havent checked the idle out yet as ive been sorting out the wiring.
i noticed the idle speed adjuster but it seemed to not move but ill look again cos i didnt really know what it did.
when it runs it does spirt out fuel out of the little nossle at the bottle of the carbs.
when i open it up you can see inside th carbs and the little covers on the front open and close ok.
ill have a play around at weekend and see what i can do with it. and try fit a airfilter.
i have the big box for it but no actual filter.
cheers again
ill see what i can do with it tonight.
dave
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jossey
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| posted on 18/10/10 at 01:02 PM |
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how do you balance the carbs..
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NigeEss
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| posted on 18/10/10 at 01:20 PM |
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quote:
Originally posted by jossey
how do you balance the carbs..
Attatch a vacuum gauge to each carb. There's a small pipe sticking out of each
carb with a cap sealing for this job. One may have a pipe which would have gone
to the vacuum side of the fuel tap.
Slacken the clamps on the butterfly shafts and adjust till all readings equal, tighten clamps.
You could make up a set of gauges with some clear pipes, manometer fashion.
Video here
Time is an illusion. Lunchtime doubly so.................Douglas Adams.
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tony-devon
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| posted on 18/10/10 at 02:03 PM |
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pretty much as previously said
first stage sort out the carbs internally, remove float bowls, clean out the jets etc, will probably have got varnished up in there
you can balance the carbs now, but, will need to be again properly once you got airbox and exhausts sorted
set of vacuum guages, carbtune or davida
connect them to the inlet manifolds twixt carbs and head
3 adjusting screws, so you balance carbs 1 and 2, then balance carbs 3 and 4, then using the adjuster in the middle balance 1+2 against 3+4
will probably then need to lower the idle setting.
if any problems then one of the first places to look with bike engines, is for air leaks around the inlet, very common problem, popping farting, revs
not dropping clean and quick, revs hanging etc
a squirt of easy start or similar around the inlets with engine running will tell you.
heavy is good, heavy is reliable, and if it breaks, hit them with it
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jossey
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| posted on 18/10/10 at 02:32 PM |
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thanks again all.
tony ill give it a go and see how i get on.
thank you for takign time to message me :O)
at least it starts :O)
dave j
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twybrow
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| posted on 18/10/10 at 05:31 PM |
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Surely the carbs would have to be very far out of balance to cause this? More likely crud in the carbs I would suspect.... Good luck with the fix!
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