1981 Yamaha Maxim 650

[Boost4VR4]

So I got a bug in me to look at motorcycles, so I perused around on Craigslist in my area. I found a very clean bike for the year at a really cheap price. Cheap as in, 100 dollars. Came with full windscreen, back storage box, and of course all of the engine and transmission.

I have already started to tear into it and found the engine is seized up. There was water in half of the engine and no oil in the crankcase. The engine will need a rebuild. The trick to this project is finding the parts for it. Thankfully, most of the parts I need I can get, there are a some that will need to be aftermarket.

I don't have any pictures yet, however, stay tuned.

PS. I am working on the Stealth as well.

[j2k4]

PS. I am working on the Stealth as well.

Oh, sure....

[Boost4VR4]

Made a lot of progress on the bike already. It will probably be running in a few weeks.

[Boost4VR4]

[Boost4VR4]

A little polishing today:






Carburetors cleaned out, bottom left carb jet needs to be replaced:

[Boost4VR4]

Ah more work completed this weekend. Motor came out last weekend and this weekend, motor got disassembled:

The shrapnel is the cylinder wall/sleeve for cylinder 3, remember that mangled piston?

There were pieces everywhere.
So I opened it up:

Cleaned out all of the pieces and checked the transmission gears. The gears were unscathed!


Bad pistons and connecting rods
New pistons and connecting rods installed:

Shot of the top half of the engine:

THe following is coming for the bike:
Caliper rebuild kit
Brake Master Cylinder rebuild kit
Full Engine gasket set from Japan
Carb float needle
Carb float bowl gaskets
Oil Filter
Spark plug set
That's all I have for now!

[j2k4]

I hated working on bikes - glad to be able to watch you do it, Kev.

[Boost4VR4]

Well, I picked up the Engine Gasket set that came from Japan. Can't believe it took only a few days to arrive. So this weekend I will build most of the engine. I need to get the cylinder and head hot tanked, valves lapped and cleaned up.

[MDoe8]

man that engine was nasty!

[Boost4VR4]

Machine shop has head, cylinder, and cams, waiting for all of that, haven't started putting it together, so will be doing that this week. Been trying to get other stuff finished up at the house.