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Discussion Starter · #1 ·
I have an 87 125 trx that was running great and has great compression, I am looking for some help on cam timing and is there a bench test for ignition module. She ran great until she sucked a choke flap screw, so we had to tear her down. No scars to cylinder or valves. Still has great compression but very little to no spark
 

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I have an 87 125 trx that was running great and has great compression, I am looking for some help on cam timing and is there a bench test for ignition module. She ran great until she sucked a choke flap screw, so we had to tear her down. No scars to cylinder or valves. Still has great compression but very little to no spark
the timming is simple on those..you put your cam lobes facing down..piston on TDC on the compression stroke..your timming chain cam sprocket has either punch marks or lines on it...if i remember..those bikes has a punch mark on the cam sprocket ?..doesn't matter to much..what matters is having the cam lobes facing down..piston on TDC on the compression stroke..then put the timming chain on the cam sprocket. just make sure you piston is on TDC !!. as for the spark issue..pull the top left c.d.i cover off..there are two screws that you loosen to adjust the gap on this...you can adjust this while the motor is running..< this is if your motor is in fact running > ?..either way..adjust it to get more spark. also try another spark plug..and check your coil..coil ground..and worst case..your stator could be going out.
 

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Discussion Starter · #3 · (Edited)
thanks, i did my timing correct, now I will try to get my spark thanks again,,,,.....

I looked at my machine and the cdi is a solid state. There is a fuse box with plugs..

any way can you tell me how to test my stator and is behind the pull start or on the right side
 

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thanks, i did my timing correct, now I will try to get my spark thanks again,,,,.....

I looked at my machine and the cdi is a solid state. There is a fuse box with plugs..

any way can you tell me how to test my stator and is behind the pull start or on the right side
There is no test for the CDI other than to replace it with a known good one.

I'm not too familiar with the 125, but most other ATVs have the stator on the left side, behind the pull start.
 
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