Thanks a lot guys !

Rizingson's stunning YASC-1
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Show posts MenuQuote from: m in sc on November 01, 2025, 08:03:43 AMget a hotter set of coils.
Quote from: SoCal250 on August 04, 2025, 02:00:09 PMQuote from: Pravin on August 04, 2025, 05:21:46 AMThis information is very helpful , do you mind extending the source ? I mean is it from any top shot Yamaha specification sheets ? Or any manual ? At least it's not there in service manuals :)I've added the source info to the original post
I've added the source info to the original post
Quote from: m in sc on July 18, 2025, 07:37:29 AMyou looking for a stock dyno run?
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Ideally stock duno tub if anybody has done that also will do
Quote from: m in sc on July 02, 2025, 02:45:18 PMit will. imho it would be cheaper to retrofit a modern motocross rear hub but only if you had access to a good fabricator or could do it yourself, if you were going disc rear. I can dobthat kind of work and it literally wasn't worth my time when I did it, and went w the rd hub. I've never wanted to add a disc since to projects after it really was no functional benefit, to me. 0.02
Quote from: SoCal250 on July 01, 2025, 08:56:40 PMDue to the worne out drum the balw shoes also wear out fast and before bottoming out brakes stop working cas the drm is outQuote from: Pravin on July 01, 2025, 10:32:46 AMBrake shoes every 5k runThat's a lot of brake shoe wear!Are you sure you're not resting your foot on the pedal while cruising?
Quote from: m in sc on July 01, 2025, 10:38:41 AMvery expensive. I've done it, not worth it aside from looks. get a fresh drum hub and ride the rear brake less?
Quote from: 1976RD400C on June 07, 2025, 07:39:51 AMRan the micrometer on the new cylinders and pistons.
Cylinders were within .0005" of taper and each other. Pistons were exactly the same size. Ring end gap was .009" and 3 of them and .000 on 1 of them. Piston clearance is about .003". Not really any port chamfering done. This is very odd, look at how the small transfer port is lower than the larger one. It's so low it is not open all the way when piston is at BDC. The larger tranfer is at the right stock height but the little ones are too low. The exhaust port seems a bit small, and the top is 31.5mm down, stock is 29.5mm. The wall thickness of the sleeve that sticks out the bottom is 2.75mm, an oem cylinder is 4.50mm. I think you would have trouble if you installed these without checking and adjusting a few things.
I have got the exact set in India , Indian HT models were having 31mm Exhaust and 46~47mm Transfer and Yes the Aux Transfer port opens at 48 : ( same like this kit ...
I spend 2 days with Pencil files and 300 400 grit papers and did the chamfer and the ports came out smooth ...I used DYKE ART STD Pistons .
Bike ran reasonably well but am planning to match up the aux port to 46 and see how she performs when I get some time .
USA 29.5 Kits also have this xfer port mismatch issue ?
Cheers,
Pravin
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