Engine rebuild Parts list

[Johnwebley]

How close are you to Liverpool?

Grampian Motors do a fair job



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[Dolomite_]

Thanks, Laverda Dave, I'll give Nurse Julie/Graham a dm. Not purchased any pistons yet, I'm waiting until I've sorted everything out with the engine. I was just going to go with the Davis Silvers Spares oversized ones so I know they will definitely fit but are there any that might be better?

Are the NOS Honda ones new old stock?

[Athame57]

Are the NOS Honda ones new old stock?

Sounds like an oxymoron dunnit? 

[Dolomite_]

Are the NOS Honda ones new old stock?

Sounds like an oxymoron dunnit? 

FFS I read it completely wrong . I've never seen new old stock abbreviated

[SteveD CB500K0]

It is a shame that NOS seems to be ingrained in the vernacular.

“Unused Old Stock” would have been better.

Too late now.


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[andy120t]

..could be nitrous oxide ?🙂

[Athame57]

..could be nitrous oxide ?🙂

...Not On Shelf?

[Cb750r]

So you’ve bought a full gasket kit and plan on opening the engine, as others have said you might as well measure inspect but plan to replace all the main bearings and con rod bearings.


New cam chain, primary chain, tensioners for chains, Seal kits, dowel pins sometimes they get stuck in the cases, new chain and sprockets, plan on replacing some of the hardware like any countersunk screws if they’re tough coming out and the heads look manky. Fresh clutch, measure clutch springs replace if necessary.
Fresh rubber intakes for the carbs, if yours are old and hard.

Those are some of the things I’ve had to do in the process of my 750 engine builds. I know some are engine adjacent like fresh chain and sprockets but usually when engine is out it’s time to give the bike a solid going over.

Heck I’m down to bare frame on this engine rebuild…

[Athame57]

So you’ve bought a full gasket kit and plan on opening the engine, as others have said you might as well measure inspect but plan to replace all the main bearings and con rod bearings.
New cam chain, primary chain, tensioners for chains, Seal kits, dowel pins sometimes they get stuck in the cases, new chain and sprockets, plan on replacing some of the hardware like any countersunk screws if they’re tough coming out and the heads look manky. Fresh clutch, measure clutch springs replace if necessary.
Fresh rubber intakes for the carbs, if yours are old and hard.

Well, entire cam chain system and seals and also the intake rubbers were supplied along with gaskets from the start. I asked about the primary and got told it wasn't bad. A new piston ring was needed, the pistons were cleaned up too. Also a stripped thread in the cylinder head was dealt with. I've been a bit lucky I think. 

[Bryanj]

Disagree about shells, inspect yes but replace only if wor and make sure you know where they were originaly

[Dolomite_]

Disagree about shells, inspect yes but replace only if wor and make sure you know where they were originaly

I've not looked at the crankshaft bearing just yet but the big end bearings seem ok, still slightly shiny. But I think I may as well replace them.

[Laverda Dave]

Disagree about shells, inspect yes but replace only if wor and make sure you know where they were originaly

I've not looked at the crankshaft bearing just yet but the big end bearings seem ok, still slightly shiny. But I think I may as well replace them.

Before you go and spend a shed load of cash on new shells get yourself some green plastigauge for £10 and measure the shells you have. Take some photos and post them here and do the same for the mains. The experts on here will be able to advise if the shells are scrap or useable (and assuming they are within tolerance after measuring with the plastigauge).
As has been said previously, please make sure you have made a note of where each individual half shall has come from and if it came from the top or bottom crankcase half. Post some photos of the journals as well.
One item not mentioned for your parts list is a tube of Hondabond. You will need this when assembling the crankcase halves. It's not cheap and don't be tempted to use instant gasket, you'll regret it when it blocks up the oilways and wrecks a newly rebuilt engine!

[Bryanj]

If you havent looked at crankcase how are you seeing the ends? And they are supposed to be shiney where they bed in, put up pics for advice before spending a fortune

[Dolomite_]

If you havent looked at crankcase how are you seeing the ends? And they are supposed to be shiney where they bed in, put up pics for advice before spending a fortune

I hadnt taken the con rods off then, but I have now.

[Dolomite_]

Before you go and spend a shed load of cash on new shells get yourself some green plastigauge for £10 and measure the shells you have. Take some photos and post them here and do the same for the mains. The experts on here will be able to advise if the shells are scrap or useable (and assuming they are within tolerance after measuring with the plastigauge).
As has been said previously, please make sure you have made a note of where each individual half shall has come from and if it came from the top or bottom crankcase half. Post some photos of the journals as well.
One item not mentioned for your parts list is a tube of Hondabond. You will need this when assembling the crankcase halves. It's not cheap and don't be tempted to use instant gasket, you'll regret it when it blocks up the oilways and wrecks a newly rebuilt engine!
[/quote]

Ive ordered some plastigauge green, should be here next week.

My nail doesnt catch on any of the crank case bearings but does slightly catch on the con rod bearings. I went to the engineering firm at lunch today, who fixed my tensioner for his opinion, he's been doing engine work for 40 years and has been recommended by a local restorer who uses him who has done work on previous cb400fs he was restoring. He said they dont seem too bad and would just replace them like for like. I'm going to wait until I can test it with the plastigauge before I pull the trigger on anything.

Upper crank case




Lower crank case



Con rod example



Another con rod