Are all year XS/Tx engines similar?

[71xs1]

I have a 1971 XS1 that I am in the process of rebuilding. I have a 74 Tx 650 engine I was going to put in the 71 frame. The 74 engine has a 4 bolt valve adjustment cap instead of the 3 bolt on the 71. Plus it has a electric starter. It looks like everything is the same except the above listed. Will this work with stock wiring? Thanks in advance,and sorry for all the questions..

 

[rebel542]

The 74 engine will bolt in but I think the starter lug will hit the frame. You would have to heat the frame with a torch and dent it in to get clearance. Stock wiring is not set up to deal with electric starter.
If it were mine i'd keep it stock!!!!!

 

[71xs1]

Thanks for the reply!! The only reason I was gonna change engines was 71 has ashifting issue. When you try to downshift it doesnt catch in gear. you have to pull up on shifter a little then it will shift. I guess I will just try to work out the shifting issue! Don"t want to dent the frame. Thanks a lot!

 

[rebel542]

You should be able to address your shifting issues by pulling the clutch cover only. If you don't have a service manual get one. Good luck.

 

[gggGary]

Rebel has it, there is a shift shaft centering adjustment that may be all you need to do. A bit easier than swapping motors.