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how do i set the timing on a 91 formula plus 521cc oversized .020? i know a little about how to set it but not sure which timing mark to use on the MAG side and what the correct angle is or do i just use the arrow on the case? what shoud this sled have for jets it has 330 & 340 now

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there should be a timing mark by the pull starter and and a ticker on the stater cup in the mag housing you can see throught he hole, just get that lined up and the mag piston will be at tds. and you can put the valve on so that that it is open on the mag and the pto side intake will be closed
 

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and to find the jet size go to www.hlsm.com and go into the skidoo microficke and look up you model and under the carbs you will find the size
 
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