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Author Topic: Rebuild Question - Do I need to order OEM washer seals ?  (Read 345 times)

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Offline gbutler

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Rebuild Question - Do I need to order OEM washer seals ?
« on: July 31, 2022, 03:16:03 PM »
Hello everyone,

I recently started my first ever motorcycle rebuild on a CB 400f (1975). I ordered a gasket kit and will be replacing the gaskets, o rings, and cylinder rings. One item I cam across are the seal washers (part # 90442-377-000) that go on the bottom of the special nut ( part # 90237-333-000). They appear to be a kind of rubber washer with a copper metal inner. They seem a little rough and I'd like to replace them but I don't really want to wait weeks for the part to ship in to install it. Does any one have any advice on how necessary it is to get the exact same washer? Are there alternatives? Or is it not that critical to have a brand new one in there?

I have essentially the same question in regards to the copper washers and nuts that are used on the head bolts as well.

Any help or advice is appreciated. 
Thanks!
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Online newday777

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Re: Rebuild Question - Do I need to order OEM washer seals ?
« Reply #1 on: July 31, 2022, 05:28:42 PM »
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline bryanj

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Re: Rebuild Question - Do I need to order OEM washer seals ?
« Reply #2 on: August 01, 2022, 12:27:43 AM »
Not replacing them gives a common oil leak and they are still available from honda, just had two for a build i am doing
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!
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