So I’ve just finished building my first engine and have my eyes set on the next. I’m hoping to get most of the CAD work done over the winter and maybe start manufacturing next summer. So at the moment I’m just trying to source a suitable crankcase, gearbox and clutch so I can get the ball rolling when I run out of things to do on other projects.
The plan is to use 4x Chinese YZ85 barrels and crankshafts with a custom lay shaft joining it all together. Hopefully it’ll make 100+hp
So what kind of gearboxes do you think would be a good or bad idea?
-I keep seeing cheap Hyosung GT650 motors which are rated at about 55nm and have 6 gears
(Cheap but unsure about the quality)
-I’ve also been looking for some 600cc bottom ends but everyone wants the earth for them
(Too expensive and most have oil fed through the centre of the shafts, I’m unsure if I can delete this feature without sacrificing reliability)
-I could use a 450 MX gearbox
(Probably too fragile, plentiful and light weight, may need a bigger clutch, probably only 5 speeds)
Here’s some pictures of the last engine.
Bookmarks