1977 Suzuki RM80B and a 1978 Suzuki RM80C resto/mod builds

Thanks
The case set on the 77B is totally different than the 78/79 set
5 speed engine
4 plate clutch basket
space by countershaft for a oil injection pump
crankshaft length on ignition side extension CDI spacer plate

Gusseted frames, skid pans, mounts in progress
copied all the stampings from the C and added to B

The frame engine mount holes on all the 76-78 RM's are way oversize vs the bolt/ case mount holes so fabricated these 17-4 ss bushings that press into the frames and have the correct i.d. for the bolts

The 78C countershaft spacer's are NLA so i made 17-4 ss replica's to replace the corroded stock left spacer

Relocated the CDI mounts from the 77 to the 78 location
Will be using triples on the 77 from the 78C
need the clearance
Using 79N on the 78 -30mm vs 28 78

Lots of work ahead! Cylinders are bored(.02 over. .04 over) ported

A few of the pipes
some are missing from pic

Cool, I see your number 12, one of 78C's I have here has the same #12 on it also from 78 ( rough shape, on side panels, broken front plate from D23 in 78

The 77 frame had 2 hairline cracks in lower frame cradle in same spot both sides, copied gussets from 78 and added to 77 per pic

Both frames had cracks
you have to enjoy the casting quality
the tiny S on the cylinder base
the 77 here has the boss for oil injection
and a area on the cdi side for the oil pump drive off of the drive shaft

78 C jug casting, lots of mislabeled parts on the internet
The 78C, 79N castings no boss for oil port
10 mm holes for rear studs
80-81 8 mm holes

They share the same case set/ parts, even with the JR80, but the cylinder is 77 RM80 only
case is from a street bike

pipes cleaned

Purchased more parts this past weekend, drove to
Green Bay area for some nice used parts

Custom machined bushings for the engine mounts
really tighten up the fit to the frame , single stage enamel on the frames.

A little progress on the 77B
painting frame on the other 78C

Found some new CDI boxes, mounted up with billet aluminum washers

heat shields- fresh paint

I will be replacing most of the steel hardware with aluminum/ ti handmade bits
billet aluminum drain plug/ aluminum crush washer

And we have ignition on the 77B!

More progress on the B, new carb, pipe is ready to bolt on
Will get the engine in one of the 78C , and similar progress , 28 mm carbs on the C where in great shape , just carb kits

Thanks
worked on the C final engine assembly, silencer paint

1977 B with pipe mounted-it was a rust free pipe
to start with!