justsmith94 Posted May 20, 2015 Report Share Posted May 20, 2015 Im building a trail bike and am looking to go with a 4 mil stroker crank. The current motor setup is as follows: Hjr dune/play port 65mm bore Stock head milled down Vforce 4 reeds Timing plate set to +4 T5 pipes The motor has about 10hrs on it. With new seals and bearings in bottom end. Top end is the same. Had fresh bore and hone when i got the bike. My qestion is, what parts will i need to swap to a 4 mil? Im probably going to run the spacer plate because i will hopefully be going to a serval motor some day. Any help would be awesome. Quote Link to comment Share on other sites More sharing options...
BANSHEE HP Posted May 20, 2015 Report Share Posted May 20, 2015 You'll need the crank of course, head and domes, pistons, gasket and someone to check out you ported stock cylinder to make sure the port timings are in the ball park. Quote Link to comment Share on other sites More sharing options...
justsmith94 Posted May 20, 2015 Author Report Share Posted May 20, 2015 Thanks bansheehp. Ive never really messed with stroker motors before to know all of the necessitys. So when you say pistons, head, and domes, im guessing this is for the added 4mm of stroke? I thought that the vitos spacer plate was designed to raise the port timing, the dome clearance etc. to be able to run the crank without further modifications? Please correct me if im wrong, the only knowledge im going by is from reading online (havent contacted a builder yet to fully understand the process) Quote Link to comment Share on other sites More sharing options...
SandSlingerOR Posted May 20, 2015 Report Share Posted May 20, 2015 Yeah dont run a spacer plate. Best to go with a aftermarket head & domes cut for your motor. After those mods I'd look into clutch mods to handle the added power. Quote Link to comment Share on other sites More sharing options...
justsmith94 Posted May 21, 2015 Author Report Share Posted May 21, 2015 Ok. So now what type of pistons do i need? I think im just going to get in contact with a builder to see what i need. I would like to build this motor myself since it should be a minor build. Quote Link to comment Share on other sites More sharing options...
SandSlingerOR Posted May 21, 2015 Report Share Posted May 21, 2015 Or just go ahead & get that serval or cub instead of dumping more cash in stock cylinders. Quote Link to comment Share on other sites More sharing options...
justsmith94 Posted May 21, 2015 Author Report Share Posted May 21, 2015 Or just go ahead & get that serval or cub instead of dumping more cash in stock cylinders. I really thought about it haha. But i figured if i put around 1500 in it now, i can finish out this season and by the first of the year my truck will be paid off. So ill be saving 400$ a month that will go towards a serval motor. Quote Link to comment Share on other sites More sharing options...
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