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You can buy a GS650, don't ruin your 550. The GS650 is only 20 lb. heavier than the 550, but has 73 horsepower!.
You can build your GS550 to a stre$$ful high 60 HP level, but then you could just buy a GS650 with an easy 73 HP.:-\\\
Good idea about not doing a 650 conversion, I read a thread about a basement project doing that, but no long term follow up
, probably didn't work so well.:-kGood idea about not doing a 650 conversion, I read a thread about a basement project doing that, but no long term follow up
Replacement pistons come in 2 incremental oversizes, each just large enough for restoration of power in high mileage engines: 0.5mm, and 1.0mm. The cylinder is rebored to fit them. the pistons are purchased first so the machinist can measure them before he rebores the block. So your engine might be due for the first oversize rebore of 0.5mm, but it would have to be measured to know.
If you like (had money) you could consider: new oversize pistons, performance cams and valve springs with the piston tops cut to stay clear the valves. That would mean rejetting the carbs too, because the whole engine management system is connected like a chain, and all the changes will have to be tuned to work together as a unit. Interesting work if your up to it.
Bill
