Matt21
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| posted on 13/5/14 at 06:18 PM |
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engine 'bawking'
I went for a drive earlier, an hour in with no hicups and then suddenly its making a bawking sound on full throttle, theres a lack of power and its
struggling above 4500rpm
the engine is a 98 cbr900
i got home and checked for a spark, all present
took bottoms off the carbs and cleaned out
tried with and without air filter
new inline fuel filter
still has the same problem
any ideas?
getting rather sick of this car now  track day on saturday too!
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loggyboy
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| posted on 13/5/14 at 06:21 PM |
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What's bawking?
Mistral Motorsport
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Matt21
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| posted on 13/5/14 at 06:26 PM |
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stuttering
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SteveWalker
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| posted on 13/5/14 at 06:41 PM |
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Baulking?
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gaz_gaz
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| posted on 13/5/14 at 06:46 PM |
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quote:
Originally posted by SteveWalker
Baulking?
Oxfordshire isn't it??
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gaz_gaz
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| posted on 13/5/14 at 06:49 PM |
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quote:
Originally posted by Matt21
I went for a drive earlier, an hour in with no hicups and then suddenly its making a bawking sound on full throttle, theres a lack of power and its
struggling above 4500rpm
the engine is a 98 cbr900
i got home and checked for a spark, all present
took bottoms off the carbs and cleaned out
tried with and without air filter
new inline fuel filter
still has the same problem
any ideas?
getting rather sick of this car now track day on saturday too!
Coilpacks failing under load? Had a similar issue!
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Matt21
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| posted on 13/5/14 at 06:52 PM |
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could be a good shout
is it possible to replace with a coil pack off any bike? or would it have to be a cbr900 one? chances of me getting a spare to try before the weekend
is slim
or is there a way i can test it? or rig up my multimeter to see what its doing whilst driving?
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ReMan
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| posted on 13/5/14 at 07:03 PM |
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Assuming it was OK when you last used it, fuel etc good and no changes, then outside the box….
Reg-Rec failing
www.plusnine.co.uk
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Matt21
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| posted on 13/5/14 at 07:07 PM |
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iv just replaced the reg/rec for a brand new one 2 days a go, it better not be that!!!
was running fine when i set off and hadnt had this problem before.
could you explain how the reg failing would cause the stuttering?
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maccmike
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| posted on 13/5/14 at 07:16 PM |
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Fuel pump relay?-if fitted
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Matt21
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| posted on 13/5/14 at 07:19 PM |
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no relay for the fuel pump, it seems to be ticking away just fine
something i had noticed though is the fuel filter (inline one) only has a dribble of fuel in it, though i guess the pump has filled up the chambers in
the carbs?
its been running fine like this before anyway
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ReMan
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| posted on 13/5/14 at 07:48 PM |
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quote:
Originally posted by Matt21
iv just replaced the reg/rec for a brand new one 2 days a go, it better not be that!!!
was running fine when i set off and hadnt had this problem before.
could you explain how the reg failing would cause the stuttering?
Oh yes, sorry didn't twig that was you!
How's the charging voltage now?
Its a known issue, no I can't explain it, but it can cause poor running when failing,. Bust as you say it won't be that!!!
www.plusnine.co.uk
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Matt21
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| posted on 13/5/14 at 07:53 PM |
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it better not be that!!
voltage sits at..... 14.8 i think it was, seemed high to me, but its very constant! it never changes no matter how high the revs go.
with it being a new one etc i assume that its all ok
i think il double check it tomorrow just for peace of mind/rule it out
im quite tempted just to buy a spare engine and throw it in as this ones giving me nothing but trouble lately
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Matt21
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| posted on 16/5/14 at 05:47 AM |
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fixed.....
though i think il keep the problem to myself for now 
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gaz_gaz
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| posted on 16/5/14 at 07:39 AM |
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did you put fuel in it?
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ReMan
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| posted on 16/5/14 at 07:53 AM |
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quote:
Originally posted by Matt21
fixed.....
though i think il keep the problem to myself for now
Reported. Against forum rules 
Spill....
www.plusnine.co.uk
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Matt21
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| posted on 16/5/14 at 08:26 AM |
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yes it had fuel in though it had crossed my mind on the first day of trying to find the problem....
In my defence.... I know bugger all about carbs....
when i took them apart to clean, I didn't want to tinker too much in case I made things worse, so i just took caps off and cleaned with carb
cleaner and cotton buds and put the caps back on, three times i did this!!!!
and I didn't once notice that one of the four main jets was completely unscrewed while the others were nipped up tight.
how I didn't notice I'm not sure, too busy looking for dirt than looking for loose bits i guess
at least now I know my fuel filter is new, fuel lines have no blockages, carbs are clean inside (and the jets are tight ) my coils work, ht leads
and plugs are fine, reg/rec is fine and nothing else is causing issues
bloody muppet
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gaz_gaz
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| posted on 16/5/14 at 08:30 AM |
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So all that's left to do is enjoy your trackday!!
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Matt21
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| posted on 17/5/14 at 08:28 PM |
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Trackday thoroughly enjoyed
I even won a medal for the sprints! Most consistent times!
For six timed runs they were all within 0.13 seconds I think he said!!
It's no rocket ship, 1:16.01 was my best, got a 1:16.08 with a passenger too
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daniel mason
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| posted on 17/5/14 at 08:48 PM |
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That's not bad from a standing start! That Westfield that did a 64 at last years wscc blyton sprint must have been trying pretty hard
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