exhausts!!?

[pogle]

hi im new on here, i am building up 1971 c50 with a 70 top end large valve head ported ect. my question is what pipe to use? im thinking one from a 90? has anyone done this? or shall i use a pit bike exhaust. hoping to keep it original looking if i can. also has anyone got some good close up picks so i can see the loom route as i got this bike as a 25% compleat pile of junk its like a jigsaw !

[wightegi]

The standard 70 goes prety well as it came so the standard exhaust would seem to work , there are wiring diagrams in the guides section .

[pogle]

hi and thanks the 70 exhaust im told is the same as the 50 i might try the 90 and the 70 and compair the two im trying to improve the flow hence all the porting work. i still have to work out the jetting on the carb as of yet! the wiering diagrams are good and i have a nos loom, my problem is the path the loom takes through the frame/steering it seems long at the front and short at the rear! if i move it the middle is wrong! it is the correct part no for the frame number! all part of the fun...

[Newtsalad]

Worth watching out that you don't pick up a zorst for a 50 thats labelled/stamped up as a 30mph item.

They have a really thick (10-12mm) washer that only has a breathing hole about 10mm diameter, to restrict the speed. I have ground one out, but it took time and is only worth messing about with if you pick one up cheap. Mine was £15.

[Newtsalad]

BTW the M-tek zorsts are nice, stainless header, a tad on the noisy side perhaps, but breathe well!

[pogle]

Worth watching out that you don't pick up a zorst for a 50 thats labelled/stamped up as a 30mph item.

They have a really thick (10-12mm) washer that only has a breathing hole about 10mm diameter, to restrict the speed. I have ground one out, but it took time and is only worth messing about with if you pick one up cheap. Mine was £15.

ahh i picked a c50 lac one up on ebay last year 99p +£10pp...then i read on here thay are no good i will give it a go...thats why i was the only bidder, is that the only restricton ?

[Newtsalad]

I have no idea what's inside them as they are sealed. I removed the washer and put it on a 90. I'm not sure which of my bikes it's on, but they'll all do 50mph + at a push.