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Urgh… two made two sets of slip collars after I fucked the first pair attempting to braze them. I’ve a very mixed history with brazing but I didn’t want to weld. You need to put a lot of heat into steel this thick and it warps a bit too much.
Took the second set to the weldor for a little bead of tig.
Started on the brakes but don’t have the correct banjo union…another one of those days
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Clutch Cush rebuilt - I think the technical term for the old rubbers is wanked. Intake side buttoned up with some bigger jets and new Reed spacers to try and lower the crankcase compression a bit. Speaking of compression, the cylinder compression is somewhere between 145-150psi, on the wobbly old gauge that @BRM kindly donated me many years ago…might be a bit hot. 150 is a generally right at the top of what pump fuel can live on. Hmm.
Waiting on brake parts, which hopefully should land today, after that I should be ready for a start up.
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Not mine but this just popped up on my feed, RD350 footage from 1990. Proper home movie feel about it. I can imagine the gf with one of those massive old VHS cams on her shoulder
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I had a Suzuki GT 250 in 1981, not the X7 but the model before it. Stock pic, again not mine. That thing really shifted. Another home movie that also dropped into my feed:
https://youtu.be/XPJQSugxbec?si=KqjR-uIp3ggxs4CT
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One of my mates had an X7 when I was a kid. Quick little thing - it took a substantial amount of abuse before he eventually seized it.
On the ongoing RD saga - I did one jetting pass but it was showing signs of detonation, which I confirmed by removing the heads. Back on the lathe with them, to remove another CC from the dome. Next pass was inconclusive, I had suspicions it was still unchanged though, so took the heads off again. This time, after some chin scratching, I decided to skim the head and reduce the squish clearance a little more, from 0.95-1mm, down to 0.8-0.85mm - essentially, this should remove any remaining mixture from the boundary area and prevent detonation. I took one small clean up pass on the domes to compensate the for very slightly reduced total CC.
I've also rebuilt the carbs - Yamaha fitted an unusual, air bleed type, needle arrangement for the RD. It basically means air mixes with the fuel in the cavity between the main jet and seat. I drilled out the air jet for this, and converted it to the more common, primary type arrangement. This gives a much stronger signal, so you have to reduce the main jet size considerably. Also helps with the sputtering just before the pipe kicks in.
Anyway, since then, I've been creeping down on the jetting and am getting close enough for another proper jetting pass. Bike seems happier and more tractable everywhere, so fingers crossed. Waiting on a new throttle cable as the old one is knackered and hanging up one of the slides ever so slightly....
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MrBaklava
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MTB-Idle
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About
Yamaha RD350 meanderings.
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And….on the bike. I need to make new slip collars. I was lazy to do it but they have a nasty step. Phew.
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