Engine rebuild: what to buy and where

[Zergman]

Okay, so I thought I'll do an engine rebuild this winter. Sucks, I need it NOW.
Yesterday, after a ~2km stretch of ~140km/h it started knocking a lot louder. It had this noise, but not nearly as loud (still isn't as bad as it might sound from what I tell, but I don't want to ride it like this any more).

I haven't opened the engine up yet, but I am looking at various parts options.

So anyway... What to buy?

Piston. I'd like a higher comp one. Between 10:1 and 11:1. Or maybe just got for it and buy an 11,5:1?
Here's two options (looks really good actually)
Wiseco Yamaha YFM600 YFM 600 Grizzly Piston Kit 98mm 3mm 1998 2001 4607M09800 | eBay
Wiseco Piston 96mm Oversize Yamaha 4596M09600 | eBay
I'm not sure of the diameter yet though. Will know that after the disassembly.

Gaskets. What gaskets to buy and from where?
Oil seals. The same as gaskets...
O-rings. I think I can get them at the local hardware store, if they won't be included in the gasket set.

Bearings. Are there any specific ones? I might not need to change them, but still...

Connecting rod. Well I don't know in what condition it is in now, but still, any options?

And so on... Stuff might get done later on, like a stage 1 or 2 cam, but the original one looks very good, so... Will stay for a while.

I might look like a headless chicken, running around without knowing where to run, but heck, I need your help and experience

[awolxt]

Hi !
I would go for oem head gasket, but try to source one from somewhere other than a main dealer. Mine was £54.00 and i paid it cos i was desperate to get the bike back on the road. Ive since got a couple nos ones off ebay for a lot less to use if and when theyre needed. Cant help you with anything else but good luck with the rebuild and keep us updated


Bill

[Zergman]

Since I'll probably need an oversize, won't the OEM gasket be too "small" for the larger piston?

[awolxt]

Im guessing it will be yes! Missed that bit of your post. Oops

[Zergman]

Since I want to still be able to run regular pump gasoline and I don't want to have a low moto-hour engine, I'll probably stick with the 10:1 comp piston. It's on a "sale" right now, link given in the first post. It's a 98mm piston though...
So, what should I do with the gasket?

[*Touring Ted*]

Originally Posted by Zergman

Since I want to still be able to run regular pump gasoline and I don't want to have a low moto-hour engine, I'll probably stick with the 10:1 comp piston. It's on a "sale" right now, link given in the first post. It's a 98mm piston though...
So, what should I do with the gasket?

If you're staying original piston size, go for either genuine or quality pattern.

I've used loads of Athena head gaskets and gasket sets and never had a problem. Never had one come back.

Like many things in life, it's all about the prep work. Those mating surfaces need to be beautifully clean and smooth and most importantly, FLAT !!

If you're going for an oversize (which I think you will end up doing) then you're best off to get an oversize head gasket. I think you're better off with genuine Yam if you're going oversize too. You don't HAVE to go oversize with a head gasket but why wouldn't you !!

To be honest, when it comes to oversize stuff, I always go genuine as you will know it's been properly measured and tested.

I don't know you're level of experience but if you need to go oversize you need to get your barrel honed out (usually 0.25 or 0.50mm bigger) Eg, if you go 0.25mm bigger.

You need an oversize piston 0.25
Oversize rings to fit 0.25
Oversize head gasket 0.25

Same deal if you need to go 0.50mm over.

If you're barrel and piston are totally goosed then you might need a new cylinder sleeve putting in. Then you're back to standard sizes usually.

Hope that helps.

Ted