1995 Wildcat 700 EFI - one cylinder problem

[daGoat_1]

Hello,
I'm having a problem with this old clunker as it seems to only fire very sporadically on one cylinder. I have checked the compression and its around 110-120 on both which should be very good. Its getting fuel as ive even swapped the injectors and the same. Spark is very strong on both cylinders and when i switch the cables its running the same. the only way i know its sporadic is when she does fire I can see a small puff of smoke from the faulty cylinder.
I'm pretty competant when it comes to 4 strokes but this 2 stroke EFI has got me stumped. I would like to get this sled running again as it only has 2000miles on it and still in decent shape (other than this problem
Any suggestions would be appreciated.
Thanks....

[580440]

Try bypassing the kill switch, unplug the switch and jump the yellow and brown wires.

[Smokeless1]

Does this mean that one cylinder is fine but one only hits once in awhile, or do you mean it only hits once in awhile on one cylinder and the other is dead?

[kevinbender0311]

coil?

[94Wildcat]

Maybe the reeds are bad on that cylinder.

[daGoat_1]

After trying all the options suggested I decided to pull the top end off and take a closer look. Piston and rings are gone as well as one of the pettles on the reeds. I have decided to redo the comp;lete top end and replace the reeds. While im at it ill also replace the crank seals since i have the motor out. Thanks for all your suggestions!
Does anyone know what the bolt torque specs are on these motors?

[zmpy]

Hi
These are Wildcat 650 torque specs but I think those are same with 700?
Smaller two cylider bolts 13-16ft-lb and bigger four 10mm bolts 22-29ft-lb

Tighten in three stages like this:

..5..6
1......4

3......2

And the heads... Insert all headbolts, then thermostat. Tighten the thermostat part to this torque first. 5-7tf-lb
Then tighten the head bolts to 14.5-18 ft-lb like this:
Kuvio:

..1...4
5.......8
7.......6
..3...2

Hope this helps ...sorry don't have crankase torque specs at hand right now.

[daGoat_1]

Thanks ZMPY!
You are the man and this does help me alot!
Thanks again!

[SudburyWolf]

I have the same problem did everything work out after you rebuilt it. Heres what happening with mine.
I just bought my first snowmobile used just like yours. I am having a problem with the engine. When I first got the thing it was running great really fast. Then all of a sudden it was running poorly. Then I shut it off let it sit for awhile 30mins. Then it ran good again for like 30 seconds then back to the same problem. I determined that only one cylinder was firing. Thought maybe spark plug were no good. Bought new ones, same problem. Then I bought new boots and ignition coil,the old one were corroded. Still same problem. Removed the new spark plugs both were wet, but one was black. Checked spark its good. Checked compression on both cylinders the one that's running is at 100 psi. and the one that not working its at 90 psi. It has also has had a new electric fuel pump put in from the previous owner. I don't know if that's enough compression in that cylinder? What else should I check before I take the engine apart? If anyone can help me out that would be great.

[TheUnforgiven_89]

First give your battery a fresh charge and check your fuses (especially the 15 amp battery charge fuse) and try that. The old battery efi sleds need to have a good battery with a full charge or it will run like if it runs at all. If that doesn't work, Its time for a top end anyway since 100psi and 90psi are both really low. It should be closer to 120 and anything below 110 psi is bad. If I were you I would at least do a top end with new pistons, rings, gaskets, and a good hone on the cylinders if they are still good.
My family has a '95 Wildcat 700efi touring so I know from experience that its a good sled until an electrical gremlin comes up!