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78rm125 Started a new thread Early YZ125 kickstarter splines
2/11/2019 7:55pm Just wondering about the fitment, 1986 and up are the same according to parts suppliers Is 85 and down yz125 the same spline?
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78rm125 Added a reply to 78 rm 125 clutch slipping
6/20/2015 7:28am I'll check the shaft. As my cover has been welded a couple of times. Could be distorted. Thanks for the reply.
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78rm125 Started a new thread 78 rm 125 clutch slipping
6/20/2015 7:28am My clutch seems to be slipping at wide open ,but only for the first few laps. I was running trans fluid ,now went back to 15-40 shell rotellla, but havnt ridden the bike yet. I have new frictions and steels on order. EBC frictions and Barnett steels. My springs are within spec, but I may replace them. My question is...
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78rm125 Added a reply to Suzuki RM125B 1977 clutch
4/29/2015 2:51pm Correction. I just got a 76 rm 100 basket and its different . Shallower depth for one less friction and steel ,and one more tooth on the drive gear (63 instead of 62) . 21200-41301 should be the basket you and I need. They seem harder to come by. Clutch plates are the same. Unless someone knows how to fit...
78rm125 Added a reply to Suzuki RM125B 1977 clutch
4/27/2015 5:59pm 75-78 rm 125 and 76-78 rm100 are the same . Just broke mine last weekend.
78rm125 Added a reply to Rupp Motocrosser finished
4/3/2015 1:55pm Thanks guys! Ya there was a few hundred manufactures of sleds in those times. Its only a 340 Nitro but it cooks, and I love beating on it,lol. Im actually in Manitoba. Still waiting to take the Rupp Motocrosser out, been a bit chilly lately.
78rm125 Started a new thread Rupp Motocrosser finished
4/3/2015 1:55pm Heres my 75 Rupp RMX125 I picked up before Christmas. Not sure how many were made ,but its a cool bike. Made the rear brakes full floating, added a 32mm mikuni from the bing, reinforced the frame before powdercoating it , and have some larger footpegs on the way for it.
This forum thread has 23 replies.
78rm125 Added a reply to Rupp Motocrosser finished
4/1/2015 9:00pm
That's a cool bike. Here's a pic of the sleds. We put quite a few miles on them.
78rm125 Added a reply to Rupp Motocrosser finished
4/1/2015 8:50pm
78rm125 Added a reply to Rupp Motocrosser finished
4/1/2015 4:33pm Ive heard they were a very decent bike in the day, and when they came out they could beat the Yamaha, Suzuki ,and Honda in a straight line race. Ive got a couple restored Rupp Snowmobiles and they are very reliable. That sales brochure would be neat to see!
78rm125 Added a reply to Rupp Motocrosser finished
3/29/2015 8:29pm Thanks Newman. Ya it rode really well so far on my front street, shifted nice . Spent a lot of time adjusting the trans. as they are very fussy with the adjustment. Sachs 125s were famous for having 6 forward gears and 12 neutrals.
78rm125 Added a reply to Rupp Motocrosser finished
3/29/2015 6:46pm Wow . I wonder how well he does. Looks like he has some long shocks back there. Thanks for posting the pic. Any others you can share?
78rm125 Added a reply to Rupp Motocrosser finished
3/29/2015 6:32pm Thanks guys! Ya it's a 6 speed. I heard most old bikes had weak frames so I added some gussets under the motor added a strap on the headset, and completed all the welds.
78rm125 Added a reply to Rupp Motocrosser finished
3/29/2015 4:44pm Ya ,just locally. Would like to get longer travel 31 mm forks for it, and longer rear shocks.
78rm125 Added a reply to Rupp Motocrosser finished
3/29/2015 3:16pm
78rm125 Added a reply to Rupp Motocrosser finished
3/29/2015 3:06pm
78rm125 Started a new thread Flat slide carb on 78 rm125
3/27/2015 3:34pm Im thinking of getting one for my bike. Trying to decide between a 34mm TM or a TMX. Also read that the factory Yamaha 125 from 98 and up had a half moon slide for better throttle response. Anyone have a recommendation ? My engine is stock, but getting the ports cleaned up before the season starts. Thanks ,Chris
This forum thread has 13 replies.
78rm125 Added a reply to Flat slide carb on 78 rm125
3/27/2015 2:42pm Thanks guys!
78rm125 Added a reply to Flat slide carb on 78 rm125
3/26/2015 7:38pm I ended up with a 1990 rm 125 34mm Mikuni TM . It has stock a 330 jet in it . Im assuming it will be rich on my stock 1978 motor. Even if I change the premix ratio from 32-1 down to 20-1, am I still going to be over rich? I going to run it this weekend ,if...
78rm125 Added a reply to 79 RM125 build
3/5/2015 7:14am It's the "S" on the jersey that throws it off.