Help with the poor mans 750/850 big bore

[slow_heavy_750]

Ok, so reading around and searching it seems that the cylinders and pistons will bolt up to my 78 750. (Or at least I believe so, correct me if im wrong).



Now my big question is, Ive read that any year 850 cylinders will work, then ive also read that only the cylinders from a 79 will work...can someone verify? Im not real familiar with the 850s so im not sure of what the differences are, so any help would be greatly appreciated.


I can get an 850 motor for real cheap, but its an 81 so id like to be sure im not wasting my money. Thanks guys.

[TheCafeKid]

ANY will work, but only the 79 850 will be a DIRECT FIT. The later models you will have to do some grinding to the 750 cases to get the jugs to fit properly. I am not possitive but you ALSO MAY have to use the 80 and up 850 HEAD since they're different from the 79 (the 77-79 750 and 79 850 shared heads, but in 80 the 850 heads changed to ones that used CV type carbs) I am not exactly POSITIVE where the grinding needs to be done, so you will have to ask someone that has dont THAT particular mod to be sure.

[slow_heavy_750]

Thank you very much for the quick response.


If thats the case ill most likely pass on it, im not hell bent on getting it done, just considering it if i do come across a set of cheap cylinders/pistons.


Thanks again for the quick response

[TheCafeKid]

Thank you very much for the quick response.


If thats the case ill most likely pass on it, im not hell bent on getting it done, just considering it if i do come across a set of cheap cylinders/pistons.


Thanks again for the quick response

No problem. If you're serious about doing it, TKent has a set of the 79 stuff ready to go, You might ask him if he still has it. I was going to buy it from him for my Cafe, but money constraints put the kybosh on that, and then this 1100 Bandit/Gixxer project took precidence.