Topic: Re and Re on good 1975 750 engine

[ViniToo]

Is there a recommended list of parts to replace if you are doing a basic overhaul on 750 engine? Mine is 1975 with 28,000 miles. Was running fine but seals and gaskets need to be replaced. Cam chain, adjuster, piston rings etc? I'm sure there must be lots of posts on this. Carbs have been done. Thanks.

[PeWe]

Rings should be OK. 28.000 miles not much.
Unless, bike is ridden very hard, no warm-ups, just WOT most of the time. Cheap oils.
That is a good way to let rings fall out in pieces when lifting the cylinder.
Done that in my early years.

Chains should be OK too, tensioner rubber wheels can be hard due to age. Maybe small black pieces in the oil pan.

Inspect inside pan and see status. Oil strainer must be free from debris.

A long time parked bike can rust inside. Valve seats rusty in need to be re-cut.
Clutch basket can be rusty too in need to be cleaned.

Start a long time parked bike can damage the engine.
Maybe good when parked 20-30 years ago.

Then severe rust that must be cleaned before start. If not, rust can block oil passages and wear bearings.

[newday777]

Is there a recommended list of parts to replace if you are doing a basic overhaul on 750 engine? Mine is 1975 with 28,000 miles. Was running fine but seals and gaskets need to be replaced. Cam chain, adjuster, piston rings etc? I'm sure there must be lots of posts on this. Carbs have been done. Thanks.

Welcome aboard ViniToo
Hondaman's book has that list in it. I don't have the book here at my house as it's at my shop.......
You can find the link for it in the for sale section under site sponsors



How long have you had your bike? History of it? Have you done motor rebuilding?

You should do an introduction of yourself and your bike in the new members section. Pictures of your bike are always welcome.

[ViniToo]

Thanks for the replies.
I had been riding the bike for some years, then 3 years ago was hurt in a motorcycle accident. So it has sat for 3 years. Turned over occasionally. But in the last year I rode it the gaskets were starting to leak. Seals were starting to weep. They are all original I think so definitely needing replacement.
I am ordering gaskets and seals. I just thought that once the motor was open if there are other parts that should just be replaced that I would do that. Actually a friend who is a 40 year veteran bike mechanic ( mostly Yamaha) and classic bike collector and supporter is going to do most of the internal work for me. I just want to have all the needed parts at the ready for when the work commences.
Vince

[newday777]

I'm glad you survived and are back riding again.  I had it happen in 2013. Was back riding 3 months later.

If you have leaks in the fins it's probably the rubber discs under the cam towers covering the cylinder bolt nuts

[scottly]

Unless the bike was abused or stored underwater, it shouldn't need to be overhauled with only 28K miles. Before you tear it down, you should probably do some basic diagnostic tests, like a compression or leak-down test. How is the oil pressure? Where exactly is it leaking?