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take some pics and post them up would help

i have seen this on some maxed out motocross cylinders...think it was for high compression engines to have easier starting

a cutting edge leading company like xscream...i would surly bet 99.9% it is a setback pump especially since its a newer pump that was built for the oring snap seal

due to being a easy bearing to replace, just replace it. use a bearing splitter and either a press or a puller tool on the splitter

same here

there you go correct info

sm bore 10mm stroke is the best way to achieve big transfers and the 900cc's with the 62t platform

keep looking for another machine shop

pull out the long studs-stud tools works best, but can be successful with jamming up double nuts...depending how tight they are might use some heat if real tight take it to a machine shop and have them bore the upper case in a mill with a boring head simple operation for any machine shop $60-90...

i think those are the old TWIST head domes

as long as you have good hose water pressure you'll be fine yes it will flush both cylinders 550/440 engines have a very open cylinder water jacket their all connected as one

with the diagram you posted put the flush fitting 'T'd in between the rear head outlet and the bottom of the headpipe line

sorry i dont know what LSA is? freestyle skis dont have a load when airborne and throttle is closed then have to hit hard again when the pump is heavily loaded instantly for the next trick also richer low jetting helps engines from over revving when not loaded freestyle engines are set with...

that would be something to look at most already run twin pickups maybe a bladder system is needed

always run identical carbs use 2 carbs with pumps on them round body carbs are very sensitive to pop off settings must be set the same if the carbs wont run rich at 1 1/2 turns out on the high screw you need to drill the high speed jet plug bigger

oh this is with aftermarket big carbs not stock mikunis with strong jet signal

yes that works for race skis not for aggressive freestyle you cant run small low jets when doing multiple combos or more than a few backflips in a row throttle response goes too lean

he might just be ok if he uses the limited chamber and doesn't under prop it stock cdi limiter is about 6900-6950 rpm if he props it about 6700-6750 rpm will be fine for now

higher compression engines like the timing reduced at higher rpms

i think i like the garage setup better than the ski everyone could use their own mill!