Filling the hole

[lingeringstin...]

So here's something that's been annoying me.

I want alter the guts of an engine. It's two stroke so should be easy enough to do.

For reasons too complicated to go into here I want to find an alternate source of con rods and pistons to fit on an existing crank.

Altering the barrel to suit a different con rod or piston is actually pretty easy within like 10mm either way. I've successfully used a taller piston before by making a spacer to fit under the barrel and it worked fine. Shortening a barrel to accommodate a shorter con rod and piston is easy enough too at the local back street old school bike shop or engineerinmg place and not expensive to have done.

Pistons between about 70mm to 77mm can be used in my application, so that should give scope for some possibilities.

So for instance fitting something like a snowmobile piston to some alternate con rod that just happens to fit the crank pin diameter I'm using shouldn't be that hard to do in theory.

I need to locate information so I can look up dimensions and measurements and see if there's something out there I can use.

The problem is that it's very hard to find or cross reference the actual measurements of con rods, crank pins and pistons. Most of the time you just get generalities like a certain con rod, part number blah-blah, fits years 78 to 92 Suzuki (European market exclusively) but only if it's painted red or something equally vague. I need specifics!

There's some limited info on the Wiseco sites and that sort of thing but I'm still finding it difficult to get just plain and simple measurements of readily available con rods and two stroke pistons.

Anybody know where to look for such info?

[stinkwheel]

You ought to be able to find out what size bearing they take in the big end. That'll give you the crank-pin and big end dimensions.

Has stinkybob been breaking conrods?
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Mysteriass]

Sounds fascinating...thought those days of engineering engines were gone. Knock us up a video on youtube if you do some of this work, perhaps?

Was looking for parts for my own bike a couple months back, was wondering if I could bodge it with something else if at some point it became impossible to obtain the "correct" parts.

Bit of info here:

https://www.mitaka.co.uk

There's other sites too, jap manufacturer sites if I remember correctly, I'll see if I've bookmarked any of it and post them here if I've still got the links.

[lingeringstin...]