62t, ignition issue... help!

hi guys, ill tell the whole story

i bought a RN Superjet about 6 months ago, the butcher before me had put a 6m6 in it bored to 701, the cdi on this failed, so i replaced it. this has been fine since about october 2009

next in the time line , i bought a SN Superjet with a 62t in it, which i have swapped over into the RN.

with the 62, i have kept my old CDI, as it had a increased limiter, and kept the coil and regulator etc from the 62t with the 62t.


on my first test run it seemed to go ok,

2nd test run, after about 15 mins it started missing under load- i thought this may be a fueling issue,

replaced spark plugs

3rd test run (yesterday)- ran fine for about 10 minutes- then the same problem. i went back to the trailer and have now ruled out fuel issues by running the ski on the trailer in the water whilst having the fuel return line disconnected from the tank- fuel is running out of here, even at full throttle and full load,

today i swapped over the coil, to the coil i know is good, which was running my old engine.

so 3rd run, same fault occured, but after about 5 minutes.

i now know it is not:
the coil
fuel
spark plugs



i tested the ohms and voltage of the stator whilst cold during the day today, which was all within spec.



things that can still be wrong by my guess-

faulty CDI - again!
faulty Stator




has anyone else experienced anything similar to save me wasting any further time?
 

munki63

Epoxy is my duct tape
Location
Canada
check your fuel filter in your carbs, could be plugged i had a simular prob and thats what it was, if it is your CDI i have one outta my 04 that was pulled out after 15 hours for an MSD
 

AtomicPunk

Lifetime bans are AWESOME
Site Supporter
Location
Largo, Fl
sounds exactly like my ski...
I'll be working on it tonight or tomorrow, trying CDI swap and Stator test.
 
Location
baldwin ny
sounds like a stator going bad. they will test good when cold but start to miss fire when the get some heat in them. close your plugs gap up tight and see how it runs. (like almost touching) if it runs then its the stator. cdi,s work or dont. or get an msd and it will work. (msd is triggers different long storie)
 
cheers ryan. its definately not the cdi, as i tested it with my other one today.

so its pretty much come down to the stator... which is what i thought initially - its just the hardest part to switch.



can someone confirm if i can use a 6m6 flywheel and stator on a 62t?
 

munki63

Epoxy is my duct tape
Location
Canada
Another thought, take it for a rip with out your hood on, you could have an exaust leak, if you run %100 with your hood off you have found your problem, last year I had the exact problem
 

easyrhino

needs more cowbell.
Location
The river
I had a CDI do that. Thats how capacitors and other electronics fails. I just replaced mine. However, if it was a TV, I'd do the freon freeze test.

height.250;width.150;modified.1259832994.3271.PTR-7400.jpg

"Used as a troubleshooting aid for intermittently faulting capacitors, resistors, semi-conductors, and other defective components. It also detects cold solder joints, cracks in printed circuit boards, and oxidized junctions."
 
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