Bottom End Rebuild... How hard?

[Lunatuck]

I purchased a kit to install on a bike, then I found an already assembled bike for a price that was too good to be true. Skip ahead 2 weeks, and the "too good to be true" part became more obvious. The engine is leaking from the bottom. Somewhere along the bottom of where the case splits. If I'm lucky, it's just a gasket.

So I put my other engine (from the kit) in the bike and it's running well, but now I have basically a whole kit, but no engine. Unless I can rebuild this one. I know I need to pull everything, but I don't have the tools for it. If I spend on tools, it's basically the same price as buying a new motor. What do I do with this motor? Fix or junk?

 

[gary55]

Buy the tools and fix it. You will never regret having to many tools, while not having the tools you need is always full of regurts. You also gain the knowledge of this engine and with the tools other problems that arise become your bitches.

 

[Frogslayer]

And keep all your 10mm sockets, they'll be more valuable than gold one day.

 

[Lunatuck]

I think I have everything beside a clutch and gear puller.

 

[GreasyChris]

The clutch and gear puller is about 5 bucks

 

[Lunatuck]

The clutch and gear puller is about 5 bucks

Ok. That convinced me. Didn’t even look an amazon. Just assumed guy on video was right. He has some weird spider looking contraption.

 

[mrbg]

Spider thing is a puller,go to YouTube and check out motorized bike repair videos,Fred chmelski . motor tear down is good

 

[Lunatuck]

Spider thing is a puller,go to YouTube and check out motorized bike repair videos,Fred chmelski . motor tear down is good

That's one of the videos I've been falling asleep to. I'm gonna buy the cheap ($5) puller and see if I can get it apart.

 

[Greg58]

It’s not very hard or complicated if you take your time, other than replacing the rod big end bearing. It doesn’t take a master mechanic just pay attention to detail.

 

[Greg58]

Look through the new kit parts, I have several pullers that came with kits. Here’s everything you’ll need.

Clutch Gear Puller , Gasket Set Fits 66cc 80cc 2 Stroke Engine Motorized Bicycle | eBay

Find many great new & used options and get the best deals for Clutch Gear Puller , Gasket Set Fits 66cc 80cc 2 Stroke Engine Motorized Bicycle at the best online prices at eBay! Free shipping for many products!

rover.ebay.com