We are working on a very sad 71 R75/5 that we want to remake as a shop bike and we are considering an engine swap. The engine in the bike needs a lot of work and a replacing it with something newer sounds interesting. Can anyone tell me if something like an R90 will fit into the R75 frame and mate up with the drive line?
Thanks, Doc
If you like our site, please consider joining our club!
By joining you will help ensure that we can continue to provide this service
JOIN HERE!
By joining you will help ensure that we can continue to provide this service
JOIN HERE!
R75/5 Engine Swap
No problem. But, I would use
No problem. But, I would use the later 5 speed at the same time.
Mike
Mike
67 R50/2 w/R100 engine/trans and Ural Sidecar
69 R60/2 76 R90S 78 R100RS
70 Triumph w/Spirit Eagle Sidecar
69 R60/2 76 R90S 78 R100RS
70 Triumph w/Spirit Eagle Sidecar
Engine Swap
The engines will swap straight across, no problem. The thing to consider is the numbers will no longer match. If and when it comes time to sell the bike (and yes, that time will come) prospective new owners will take issue with the numbers not matching.
On the transmission issue, I would stay with the four speed transmission, it is much more stout transmission. The earlier five speed transmissions were rather frail. Plus, having a useable kick start, in my opinion, is valuable. Again, if and when the bike is sold, having the correct transmission for the year may also be an issue.
On the transmission issue, I would stay with the four speed transmission, it is much more stout transmission. The earlier five speed transmissions were rather frail. Plus, having a useable kick start, in my opinion, is valuable. Again, if and when the bike is sold, having the correct transmission for the year may also be an issue.