Bad coil? Swap your coils and see if the problem follows or stays.
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Show posts MenuQuote from: Hemi on April 19, 2024, 07:49:19 PMJspooner,
You nailed it!
Disassembled the forks today, and found the top out valve had been reassembled incorrectly by the previous owner.
The oil flow ring that contains the spring was upside down, easy to see how that could happen.
No more clunk at extension, hard to believe that little spring and ring make such a big difference.
Many thanks!
Hemi
Quote from: Hemi on April 15, 2024, 04:43:28 PMThanks Dvsrd,
I've tried more fork oil, thicker oil, less oil.
With more oil, the forks seemed a bit more extended at rest, felt stiffer, less sag, still had the clunk.
I'll check the other things you mentioned.
Hemi
Quote from: 1976RD400C on April 14, 2024, 07:58:54 AMQuote from: Jspooner on April 13, 2024, 02:42:46 PMIt's not the dampening rod. Can't really do anything wrong there. What I'm talking about are actually at the bottom of the tube on the inside. If you pull it all apart and remove the dampening rod and look at the bottom of the tube you'll see s9me stuff held in with come c-clips. That's what I'm talking about. Normally you leave that stuff in tact when working on the forks but when you replace tubes you have to remove then and reinstall them in the new tubes.
I think it's called the top out valve. It causes real strong damping the last 1/4" of topping out. Remove the snap ring on the inside of the fork tube and pull the piston/bushing out and it should be in there, aluminum valve and spring.
<a href="https://ibb.co/BsT7108"><img src="https://i.ibb.co/9YyfMQR/20240414-074827-1.jpg" alt="20240414-074827-1" border="0"></a>
Quote from: rideitfast on March 03, 2024, 12:14:39 PMAnybody want to guess who made these? They came off a 1975 RD350 and they have been on the bike since the late 70's.
Quote from: svgarage on January 06, 2024, 01:05:31 PMQuote from: SoCal250 on January 06, 2024, 11:44:42 AMI would keep the oil pump. They're reliable and it will simplify your life.I second the motion. HVC sells the kits too. It's a good chance to make sure everything is set up correctly, so that your ratio is good.
Rebuild it with new seals if needed. Easy to do and the rebuild kit is available from Economy Cycle.
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