Superjet 701 62t running on one cylinder periodically

zac181

zac181

Location
atascadero
I need help diagnosing why my all stock twin carb 701 is randomly firing on one cylinder (front cylinder). Started out only on cold starts then would run on both after it warmed up but now it is far more often. Im getting strong spark on both wires with new plugs and just went through the carbs. Seems to be getting fuel through both sides. Although it is running rich, i would imagine that wouldn't be a huge concern. Just checked compression, both cylinders are reading at 125psi which i know is low. Stock should be around 150. Any ideas???? Much appreciated!
 
Balduccimoto

Balduccimoto

Location
NYC/Long Island
zac181 said:
That simple huh? Ill get a set and give it a shot! Thanks man
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Yes the wire could be bad near the crimp. Cut it back until you see clean wire. That is the first check I would do.

I wouldn’t be concerned about 125 psi compression because both cylinders read 125. It could be an inaccurate gauge. You should be concerned if one is 125 and the other is 160.
 
zac181

zac181

Location
atascadero
Balduccimoto said:
Yes the wire could be bad near the crimp. Cut it back until you see clean wire. That is the first check I would do.

I wouldn’t be concerned about 125 psi compression because both cylinders read 125. It could be an inaccurate gauge. You should be concerned if one is 125 and the other is 160.
Click to expand...

I figured that if both read the same pressure that my gage might be off. I ordered some new msd boots, hopefully that is the problem! Thanks!
 
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