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Author Anyone clued up on mx bikes??
Rickavo
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Registered: 2nd Jul 09
Location: Manchester
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6th Apr 12 at 10:29   View User's Profile U2U Member Reply With Quote
Went for a ride yesterday everything was fine running ok, when i was out i cut the bike out for 5-10 minutes messing with my mates bike then when i started back up and set off it was bogging out as soon as you revved.
i can build the revs up all the way slowly but then at full wack it starts revving up and down like a rev limiter

Ive changed the carb, cleaned the plug and then put my mates in and also tried his cdi aswell but still the same
the only other thing I can think of is coil/lead but the is a decent spark there do I don't know
Mark B
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Registered: 15th Mar 07
Location: Galston, East Ayrshire
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6th Apr 12 at 10:39   View User's Profile U2U Member Reply With Quote
is it a 2 stroke? it could have fouled the plug.had the same problem when my ignition timing was out
Rickavo
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Registered: 2nd Jul 09
Location: Manchester
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6th Apr 12 at 10:41   View User's Profile U2U Member Reply With Quote
4 stroke mate, I'm baffled
Mark B
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Registered: 15th Mar 07
Location: Galston, East Ayrshire
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6th Apr 12 at 10:42   View User's Profile U2U Member Reply With Quote
aw fuck knows then i dont know much about them.could it be anything to do with the valve timing?
Corsa_Sport21
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Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
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6th Apr 12 at 10:55   View User's Profile U2U Member Reply With Quote
What kind of bike is it??

Sounds like its drawing in too much air.
j10E W
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Registered: 30th Sep 04
Location: maidstone
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6th Apr 12 at 11:25   View User's Profile U2U Member Reply With Quote
What bike is it?
Wrighty
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Registered: 28th Feb 04
Location: Howden
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6th Apr 12 at 13:33   View User's Profile U2U Member Reply With Quote
has it got a clean air filter on?
XE Col
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Registered: 23rd May 10
Location: Rochdale, AKA:Boissy07
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6th Apr 12 at 17:10   View Garage View User's Profile U2U Member Reply With Quote
Had this problem on my 125 4 stroke, was water in the fuel thus getting into the carb, was leaking in through my filler cap cleaned it all out and away we go
Gaz
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Registered: 24th Aug 03
Location: Widnes, Cheshire
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6th Apr 12 at 18:19   View User's Profile U2U Member Reply With Quote
really not sure if this could be related but a friend had a what I believes was a 4stroke pit bike, he had issues similar and it was due to a fuelling pin that was initially dirty but then when we built it back up we placed it in the wrong way round.
csweatherston
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Registered: 16th Jan 06
Location: Devon
User status: Offline
6th Apr 12 at 18:26   View User's Profile U2U Member Reply With Quote
Had this on mine and my pit bike recently..
Almost definatly the coil/ ignition amp.
Ryan
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Registered: 23rd Jun 08
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6th Apr 12 at 20:10   View User's Profile U2U Member Reply With Quote
Has it got a hot start function/lever on it?
Graeme
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Registered: 26th Jul 04
Location: Northampton
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7th Apr 12 at 00:06   View Garage View User's Profile U2U Member Reply With Quote
Change the plug and look for air leaks.

If plug doesn't do it then start the bike and get it warm. Spray wd40 around the seals and see if the engine note changes.

Need to start with good stuff first though. New fuel. Clean filter and a good plug.

What bike is it btw?
Jonny.N
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Registered: 10th Sep 08
Location: scotland
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7th Apr 12 at 00:14   View User's Profile U2U Member Reply With Quote
burn it
Graeme
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Registered: 26th Jul 04
Location: Northampton
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7th Apr 12 at 00:15   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Jonny.N
burn it


Jonny.N
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Registered: 10th Sep 08
Location: scotland
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7th Apr 12 at 00:18   View User's Profile U2U Member Reply With Quote
sauce+ me = daft sorry
Rickavo
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Registered: 2nd Jul 09
Location: Manchester
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8th Apr 12 at 00:22   View User's Profile U2U Member Reply With Quote
Ended up being the timing had jumped quite a fair bit out
Graeme
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Registered: 26th Jul 04
Location: Northampton
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8th Apr 12 at 16:41   View Garage View User's Profile U2U Member Reply With Quote
Blimey. How? Presume it's on a chAin?

Bent valves? What bike?
jay26
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Registered: 22nd Feb 08
Location: North Lincolnshire
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8th Apr 12 at 16:49   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Rickavo
Ended up being the timing had jumped quite a fair bit out


Had this on a wr450, chain stretched and bent the valves

 
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