qtband
L1 Scorpion - The Great Snowmobile
Posts: 9
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Post by qtband on Feb 10, 2018 14:50:32 GMT -5
I just got this 1978 Scorpion and it won't start. The spark is good, but the compression is only 90psi on each cylinder. Will it start with that low of compression? The sled has been sitting for a few years. The rings may be stuck, I'm not sure. Gave it a shot of starting fluid and barely got a "pop".
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Post by weverat on Feb 11, 2018 10:23:18 GMT -5
Try giving it a shot of stabil through the carb, or a tablespoon of oil in each cylinder.
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scorp80
L1 Scorpion - The Great Snowmobile
Posts: 12
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Post by scorp80 on Feb 17, 2018 8:38:01 GMT -5
You should have no problem running at 90 PSI per cylinder. If it s been sitting for an extended period the carb is probably pretty gummed and varnished up. I would drain the tank, clean the card, replace the plugs, give it some fresh fuel and start pulling... a shot of starting fluid will most likely get it to fire as soon as the carb is cleaned.
Once you get it to run, check the PTO side crank seal to make sure it's not leaking (spray some starter fluid near it and see if you RPMs jump). That seal is notorious for failing if the sled has been sitting and mot run for a long period of time.
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qtband
L1 Scorpion - The Great Snowmobile
Posts: 9
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Post by qtband on Mar 18, 2018 18:02:37 GMT -5
Well, it's a runner! I took off the flywheel to clean the points and I also replaced the coils. It has good spark and it fired up! Thanks for helping out!
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Post by weverat on Mar 20, 2018 14:43:15 GMT -5
Now that is has been run, how much compression do you have ? Be sure to have both plugs out, and hold throttle wide open, give it about 6 pulls, or keep pulling till the gage stops moving.
Another thing is, those compression gages are notorious for being out of calibration. I have 3 gages and they all read different by as much as 10 pounds!
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