U
helping a friend fix his o1 mc 800 it back fires and dies very loud.electrical?? where would we look??thanks 4 the help.
back firing 800 cat
- Thread starter unclemark
- Start date
A
Does it just do it when it shuts off? if so, no worries. Mine will do it too occasionally. It isn't a big deal. However, if it does it when running, you may want to look at your jets.
U
it runs rough and backfires while idiling give it gas it dies and backfires very loud like a gunshot.after it dies it takes a wile 2 get it started again. ran same jets before with out problem.
Last edited:
C
sounds like timing..., plug wires on backwards maybe? what do the plugs look like?
Check for a broken reed.
D
You can't put the wires on the wrong plug! They both fire at the same time. Air/fuel mix could do it. Idle validation switch (I can't remember if they still had one), CDI, stator, timing key, crank phase, ign. trigger, coil, plug/wires, or tps. That should narrow it right down!
6
have you pulled the carbs and cleaned them? could be that.
U
thanks guys. will check all that out after work....... after greg buys the beer .will post findings
Last edited:
More than likely its ignition, stator/cdi. When idleing flip the choke on and try to rev it up, if it gets better its a lean condtion in the carbs (which usually creates a missfire and sometimes a backfire) Possibly dirty. check the reeds on a BACKFIRE it usually blows back and breaks the reed petals, a missfire is a pop out the exhaust and usually doesnt hurt things but indicates poor/lean burn or timing/ignition out of whack or time.
C
so theres no ignition timing to sleds? seems to me that if the mag fires at tdc and the pto fires (at the same time) while the pto piston is at the bottom of the cylinder.. wouldnt that not work well, hence having the plugs on backwards?
if i am wrong digger lemme know, but i know that on my v8's, the plugs can definatly be put on wrong... but maybe thats 4 stroke compared to 2?
N
I would check your timing key, I have had some of the older sleds where the timing key actually rusts out,and the flywheel floats around a bit and does that!!!Other than that you could also have a bad reed pedal...
Hope that helps....
Hope that helps....
Has it been sitting in the barn all summer? Take your pipe off and see how many mouse nests are in it. Could be a pluged exhaust.
U
1m800 and miko wear right it was the kill switch thanks a lot everyone snowest is the gratest
Happy to help!
D
There is timing to a sled, but both plugs fire at the same time. Look at your coil and tell me how it can seperate spark! You can switch your wires to either side and it does not matter. 4 strokes do have individual spark timing.
C
hmm interesting. okay i see now
Similar threads
