Oval Case Motors

I bought a couple of 360 8 speed bikes and found the frames are SH xxxx and SI xxxx. the number is 1500+, both motors are 67xxxx motors. The SH frame is from 1970, the SI frame from 197. Both motors are from 1971. My question is, why did they make a oval case frame in 1972 if they changed to the large case motors that year? Where they leftovers? The frame is a bolt together with the skinny lower tubes under the motor. I just thought I was unusual to have 2 different 360 motors and frames in the same year. What say you?




1970
360C Enduro 360C
SH 1556
370189
8S

1971
360C enduro
SI-24xx
370347
8S

Sorry got my years messed up from the 450 large case in 72 My bad.
Anyone got tanks that are decent? I've got a Hodaka large chrome tank with the original plastic screw on cap to trade.

Looks to me like a mishmash of frames and motors. According to the chart below the motors are 1967.

You're correct that Husky was getting rid of stock when they sold the 71 360C in 72. The replacement RT series was just around the corner, 73.

Chart is from Vintage Husky Website: http://vintagehusky.com/id.htm

That would be hilarious if they were 67 viking motors. I wonder if there is a way to tell other than the serial number. They also say 8S under the serial number.

Sorry for the typo!!

The S is for Sportsman similar to the M next to the motocross models. So they're not 67XXXX motors they're 36 and 37. That must be the typo you're referring to in your original post? No worries, been there done that.

Sorry for the excitement!!I mean confusion.Chris

I have a 1970 Sportsman C I'm redoing. Love to have somebody help me find that big long ass Muffler. Thanks Gil

Sorry Gil, the bikes I got have short pipes, though one has a short muffler. But I am looking for 1971 frames and tanks, from what I've seen, I'll be looking for a long while. Chris

Did the 1971 cross have an 8 speed trans? Or only the sportsman in 71? Trying to figure out the best way to use the 2 37xxxx motors. Been asking everyone if they have an SI frame, if I can use an MI that would help, but weren't the MI frames welded solid? Any in is welcome. Chris

The 71 400 that I had was only a 4 speed .

I see them advertised online once in a while and you can search it and get images. Would love to ride one for a day.

All 4 speed motors can be bolted into a Sportsman or Cross frame. The Sportsman frame is a bolt together and the Cross is not.

Sorry I screwed up, I'm talking about the 360 c enduro. They used the 37xxxx motors for both the c-enduro and the cross by the identifier above. But the frame numbers are different, cross MI, and c-endure SI. Thanks for the help!!

But can I assume that the 8 speed is common to the cross and the c-endure? I understand that the bolt together frame is for the sportsman only, but the SI and MI prefix to the 71 frames are both bolt together?

Sorry now I understand the cross is not bolted and the c-endure is. But are the cross motors 8 speed? Or are the c-endures the only 8 speeds for the 71 year.

Since I've got the auto about done I'm moving on to one of the 71 enduro c bikes. Trying to get the piston unstuck. It sat up in storage since I got it. I put pb blaster in the cylinder and it was still there when I got it to the shop, so a couple of months and no leak by the ring. Made a plat and put a spacer in the cylinder and used the head nuts to push the piston out. Still have about 2 inches to go but the studs are not long enough, going to make a c type press to put between the frame and the space on the piston. I think that will do. The crank and piston are really clean and the crank bearings feel good and rotate without binding. I might be lucky with the crank and not have to spit the cases. I can only hope.

Unless you plan on selling it, it would be a good idea go through the ordeal of splitting the cases so you can replace the left side crank seal, and if you have $80 include the main bearings too. On most all of the early Husky motors I've opened up that left side seal was leaking.

Hey Crash, get outta my brain!! I DO NOT want to pull the motor but know I should. I'll pressure test it once I get it apart and back together. Then go from there. I want to make it run and get the lights to work and ride it around all crusty. If I pull the motor It'll probably go Full Monty, I'm not looking for that at this time. My wife is not either!

Nothing wrong with just getting it so you can experience the eight speed. The rest can be done some other day.

Heres a pic of a 71 400 I recently took apart. A telltale sign of a leaking left seal, or a leaking center case gasket for that matter, is brown oil on the crank and carbon on the piston.