HOLY COW! This baby is running like a bat out of hell now!

I think maybe when I first took the carburetor apart and cleaned it up, I completely forgot about the main jet. As I said, it's been so long since I've worked on anything with a carburetor and points, I'm just relearning things. I easily got up to 65 mph. When I first cracked it to wide open throttle, it was like it suddenly woke up and took off! This is how I remember these running when I was in high school.

I changed the fuel line back to quarter-inch and put on a smaller filter. Quarter inch fits fine over the 5/16" barb on the carburetor.

I also ordered one of those KTM filters as suggested. That's the kind of filter this bike had on it when I started working on it, but of course it had disintegrated. I ordered that metal pod filter because it could show up very fast and I just wanted to have a filter on it while I was working on it. I was a bit worried it might let too much air in.

 

I put on the 17 tooth countershaft PBI sprocket today, and it fit on the new 112 link chain without even breaking the master link. The axle adjusters are almost all the way forward, but I have plenty of free play in the chain. It's a brand new chain, so it's going to stretch over time as well.

It gives me about 4 MPH more at 5500 RPM, however it accentuates the fact that my clutch is slipping a little bit, so that's something I've got to figure out. I'm kind of thinking about getting new springs first, and see what that does. They were about at the minimum spec, and being 50 years old, they've probably lost some of their "oomph". However I definitely like the change with the sprocket, and I think I'll enjoy it a lot more when I get this clutch fixed.


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If ya in there fitting new spring you may as well replace the fibers as well. Also take the rubber/plastic spreader rings out that go under each fiber & hang them on a nail. You won't be disappointed.

I am thinking about changing the fibers as well, but I'm going to wait until after the springs arrive, then open it up and look at them a little better, and measure the thickness. I also have read numerous threads here where it's been mentioned to take the rubber O-rings out, and I'll probably do that as well.

I also backed off the pushrod screw a little bit more today, and it's not slipping nearly as much now. I think it was actually only backed off about 1/8 turn, so I went a little bit over a quarter turn, and have adequate free play on the lever.

Another thing I noticed today... I now have 60 miles on this bike since I replaced the crankshaft seals, and I know I've burned out all the transmission oil that was inside the crankcase. However since cleaning out the main jet the other day, I just noticed today there's very little smoke coming out the tailpipe. In fact almost none after it's warmed up. It was starting to worry me, but then I began to think that's probably because now it's jetted correctly. Before when I had the throttle wide open, it was getting too much 2-stroke oil compared to the amount of gas it was getting.

From everything I've read, if these are tuned correctly they should smoke a little bit when cold, but when warmed up not really much at all.

If you've done 60 miles without problems its now running as it should . It didn't take all those miles to empty the crankcase but what was happening is the inside of the whole exhaust was soaked with oil in the packing along the inner walls & you've now totally dried it out as it should be. That my guess.

Ha, writing style changed above, must be hitting a button. Anyway, clutch fibers within reason i don't think measuring tells you much, but they get glazed up & overheated right through & just loose their gripability [is that a word lol].

So checking Partzilla, the OEM friction plates are about $15 per piece plus shipping, but checking eBay you can get a set of five for about $15 to $20 with free shipping. So now that I've made the decision to get eBay friction plates, does anyone have any suggestions which are the best?

These are what I'm thinking of buying.

but a 17 on the front ! ?!
Chain will hit the case. Happens.
 as for the clutch plates I can say probably  that we all could or would like a new clutch.
I have tried a bunch but not those. Giver a shot. Let us know if they're cool.

They'll be good. Don't have to pay heaps to get good quality. I can't bring them up typing in exactly whats at top of the link si i guess ya bought them

RT325, I hadn't bought them when I posted the picture, but I have since. The seller has already sent me an email saying that they're shipped with a tracking number. They have quite a few sold, with no complaints. Actually I'm going to get the springs and those friction discs, and just hang on to them for a while. I'll put some more miles on the bike, then I'll open it up and put those in, with some fresh oil.

Rick, I've had no issues with the chain hitting the cover with that 17 tooth front sprocket on, and I have about 1.25" of free play in the middle of the chain. I really love it for riding around town. By the way, the original sprocket was a 16 tooth, but it's been misreported in some publications as a 15 tooth. Of course I'll hang on to it, in case I ever want to change it back.