I am rebuilding my buddies 94 Storm that lost the middle and mag pistons. He bought the sled used. The sled had 340PTO/350C/380Mag jetting which seems very lean to me. It also has an RPC can on it. The stock jetting calls for 380/390/410 down to -20 F from 0-3000'. It calls for 360/370/390 from 10-40 degrees F. I have to bore it .020 over and I am installing the Wiseco balanced Pro-Lite Kit. Does it really make alot of difference on jetting when boring .020 over? I was thinking of going with the 360/370/390 jetting or should I go with 370/380/400 jetting to be safe because I am boring it .020 over? Thanks in advance!

Any Help?

why did the mag and ctr holes go away.. was it a lean burn down? What happened??

I would not worry so much about the .020 over.. I would be more concerned as to why it happened in the first place..

Right Roger.

I own a 94 Storm. Bought it new. Turbocharged it right away. Have worked on many moded and stock Storms.

The main question is: Where do the carbs bowl vents go? Airbox, handlebars, behind engine just hanging down, no airbox, what type of airfilters? This greatly influences jetting.

These early Storms were very difficult to get jetted right partly because of the larger MAG cyl crankcase volume and a crankcase that's really too large for 800 cc. The factory was having fits with this engine.

These 94s used 1.8 mm float needles/seats and had a tendancy to flood at low rpm. This caused misinterpretation of jetting correctness, often leading to lowering mains too far. Replace with 1.5 mm VITON type.

Once back together, jet it to the rich side, then slowly test run it at various throttle positions, constantly reading spark plugs and piston wash. An EGT gauge is also a valuable tool for this, but due to slow burning combustion characteristics, reads up to 1450 degrees even with correct jetting.

Good luck
Phil

Sorry guys, I forgot to say it was lean burn. I will try jetting richer. Thanks

[quote name='PatrioticInnovations' date='Oct 16 2006, 10:18 AM' post='1959322']


The main question is: Where do the carbs bowl vents go? Airbox, handlebars, behind engine just hanging down, no airbox, what type of airfilters? This greatly influences jetting.

The carbs vent into the stock airbox