Topic: Motor Frame swaps

[Hot500]

G'day all.    My first post here. I have a '73 cb500 I've just picked up. Intend to do a cafe project with it.

Ive tried the search function, but no luck with my query. I'd like to know what motors(if any) can be swapped between frames.
Is a 550 a straight fit into a 500 frame. Or even a 650 or 750.

This is my first involvement with sohc Hondas, so on a big learning curve.   

[dave500]

the 550 will go straight in,they are more or less just a bigger bore motor with clutch and gear shift improvments.

[faux fiddy]

If you are looking for the most hp, you get the most poop from the 650 which was produced well up into the eighties as a sohc. It will fit where you want it to.

Maybe I'm wrong...

[Shadowjack]

It will fit, but to get it into the frame you'll have to remove the sump pan and negotiate the primary tensioner over the frame rail, or remove it as well--on the 650, the lower right frame rail unbolts for clearance. This I've done in mockup, but I haven't gone any further. It's pretty tight over the valve covers too--I don't think I could get the head off while it's in the frame any more. Maybe, I haven't tried it.

[Hot500]

Thanks for the feedback guys. My idea was to have a motor on the side to build up into something nicely warmed over while still riding the bike. Think I'll keep my eyes open for a 550. Got a big swap meet next month, so just maybe...

[Triffecpa]

if you are buying a second motor, buy a 650.  They will bolt straight into the 500 frame.

TR

[dave500]

the 650s are rare here,im just around the corner from you hot500.

[faux fiddy]

if you are buying a second motor, buy a 650.  They will bolt straight into the 500 frame.

TR

if you are buying a second motor, buy a 650.  They will bolt straight into the 500 frame.

TR

Seems to be a bazillion of them around here.   Lots of parts on e-bay.

[Hot500]

Hi Dave500. Are you going to Malaney s/meet. Maybe see you there. Any recommendations locally for machine work, porting etc.

[dave500]

what date is the maleny swap meet?ive use gilberts head reconditioners in sth/port for car and bike head work and also precision engine reconditioners also in sth/port,the 650 is a rarer bike here,i subscribe to just bikes and have only seen one for sale,12 grand,engine bits like loose heads/carbs etc would be scarce,stick to 500/550s here,or go 750,we will have to meet up for a ride,your too close not to.

[Hot500]

Maleny swap meet is on Sunday 20th March at the Maleny showgrounds (Bikes only swapmeet) Put on by the Histotic Motorcycle Club of Queensland. If you want a venors site you can get in to set up after 12pm on Saturday. Cost is $5.00.

[dave500]

ok cool,ive never been to the maleny one,have you?mostly english or lots of jap aswell?i used to go to the one at tambourine,it hasnt been there for a couple of years now,last time i went i rode home with a complete 500 carb rack stuffed inside my jacket.