hrvespa
ETS
1981 50 special, 1977 primavera, 1964 GL 150, 1975 125 TS (early P200 engine)
Posts: 161
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Post by hrvespa on Apr 13, 2019 14:19:05 GMT
Doing some 3 to 4 speed gear conversions, I know I have to change the 4 legged gear selector, I know there are differences, square edge/rounded edge, height differences (50.2 & 50.8).
First engine is from a pk50n 3 speed, has square edge not rounded.
Second is a late v90, have also seen that layshaft has to be changed on these but pk ones dont?
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Post by tzsteve on Apr 13, 2019 16:55:23 GMT
you want to keep as much pk stuff as you can as it tends to be stronger
other than that i cant help you
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Post by jonnysnatchsniffer on May 6, 2019 12:13:21 GMT
you only need to change the layshaft to suit the backplate and hubs you are using, im sure a v90 layshaft is the same as a primmy one and 4 gears fit on no problem, the small door 50/90 is different as it only has a 2 legged selector which is not compatible for 4 gears, it may also be slighly shorter.
use the round end selector with pk gears and the square with v range gears
the 50.2 is for v ranges but you can use the 50.8 or 51 version on v range gears but you have to shorten the lugs on all 4 legs so not worth it really.
beware of any ape boxes as the ratios are total shit
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