squishio
Spanner Monkey
Joined: 07 Jul 2007
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 Posted: 20:11 - 20 Aug 2009  Post subject: Pit bike troubles - just won't run :( |
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video of me trying to start it....
https://www.youtube.com/watch?v=Pj2shM_v4qQ
On every couple of kicks it will backfire and shoot the kick start back into my leg which is fun, then after a couple more kicks it'll start run disgustingly then stop and pop backwards.
pretty much the sequence in the video.
I have just fitted a new Molkt 26mm carb but think the problem lies elsewhere as it was the same with the old mikuni 22mm carb.
A passer by who noticed my frustration suggested that the problem was the coil without any doubt. could it be? makes sense to me as maybe the spark is sparking at the wrong times?
I have had the spark plug out and there is definitely a good spark.
cheers!
Rich
Engine - Demon 140cc
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Current - Hornet 600, Transalp 650, X140 Pit, GPZ400R
Past - SY125, GT250, GT650, CX400, CBF600, Bandit 600, SL1000, GT250 |
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Dr. DaveJPS
World Chat Champion
Joined: 24 May 2008
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| Posted: 20:32 - 20 Aug 2009 Post subject: |
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it sounds like ignition timing, possibly the spark is firing on the exhaust stroke.
not sure how you adjust it on coil ignition though.... (sorry i can't be more useful) 
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"intelligent inattention is preferable to unintelligent tinkering"
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Billing
World Chat Champion
Joined: 12 Mar 2009
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| Posted: 20:35 - 20 Aug 2009 Post subject: |
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My TZR did something similar, the plug looked fine, but was failing in the cylinder, try a new plug, it fixed my problem straight away 
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'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
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spitfire123
Could Be A Chat Bot
Joined: 06 Nov 2008
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| Posted: 17:37 - 21 Aug 2009 Post subject: Re: Pit bike troubles - just won't run :( |
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| squishio wrote: | video of me trying to start it....
https://www.youtube.com/watch?v=Pj2shM_v4qQ
On every couple of kicks it will backfire and shoot the kick start back into my leg which is fun, then after a couple more kicks it'll start run disgustingly then stop and pop backwards.
pretty much the sequence in the video.
I have just fitted a new Molkt 26mm carb but think the problem lies elsewhere as it was the same with the old mikuni 22mm carb.
A passer by who noticed my frustration suggested that the problem was the coil without any doubt. could it be? makes sense to me as maybe the spark is sparking at the wrong times?
I have had the spark plug out and there is definitely a good spark.
cheers!
Rich
Engine - Demon 140cc |
hi mate,
i had the 140 version....you shoudl fion that the magnito is ajustable....1st check that.
if not your tappets are horribly out.
as with the carbs that youve changed the mikini carb is much better quaklity than thecheapo molkt carb...so id stick with that.
good luck mate,
need any more help contat me!
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You won't be able to eat my dust......As it'll settle before you get there. |
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