- 91595463_10219162494485111_6934323075617914880_o.jpg (200.74 KiB) Viewed 2107 times
Talk about anything you feel like
6 posts • Page 1 of 1
am looking at using 250 mz 5 speed gear box parts when i carry on making my four cylinder engine,was put on hold whilst i wated for operation on my neck at christmas,nearly wound up not walking anduse of y left arm and hands due to disc squashing spinal cord,but a lot better now, but about 75 per cent ok.
this is taken from the ex rex caunt 18.1bhp "at the rear wheel" rumi engine that I have owned for many years, it proved too be a bit radical for road use in its original shorter stroke / very revvy format, with a very clever engineering friend it is being re-worked to use standard stroke crankshaft and milder porting , this requires modifying a new crankcase to accept rex,s "Yamaha close ratio 5 speed yas1" gear box and all its cleverly worked out fitting and selection modifications, as there where just too many mods on rex,s crankcase to accept a normal "caged big and little end" crankshaft. hopefully the end result will make for a very usable road engine.
one of he reasons i was looking at the MZ 5 speed box is that it uses a selector drum the same as a moto rumi does and also I can make shafts to suit as the gear sets are a touch narrower than moto rumis.also the 4 cylinder will be 250 cc the same as the mz.