Six Hundred and Sixty

[Evilchicken0]

Don't the forces cancel each other ?

1 and 4 are tdc while 2 and 3 are bdc - they're opposite so they cancel themselves. The counter weights are also opposite otherwise it vibrates ... or at least I thing that's how it works.

[Alex.]

Sounds good in theory, I can see an engineering shop having a fit!

Alex.

[Evilchicken0]

Why not hold the crank and spin the lathe

[hunter]

So I got to college this evening and took a couple of pics



This is what the fuss is about - Fazer rod



I cleaned up the pistons before they were ballanced



The 3HE (left) and Fazer (right) crank ends. The 3HE is slightly shorter than the later one.



3HE (left) and 4JH (right) - I need to know about the crank end seal. The 4JH looks like it's a wider seal than the 3HE ... I need to know if I can fit the 3HE into the crankcases.

The good news - after measuring the crank and rod journals they are give or take 0.01mm the same so I can use the existing shells.

looks like the seal you need is 24x40x8mm

[Maelstrom]

EC
2 cents worth.
Better not to machine anything on the crankshaft ends. As I understand it, you want to use the flywheel and stator from a different model. You could consider changing the flywheel centre or modifying the original flywheel to match your requirement (if that is possible). No doubt you have seen the stator kits that BDK do and also Electrex
http://www.electrexworld.co.uk there might be something there that is usable.
While you have it apart you might also consider crack test, polishing and shot peening your rods (in that order). It is not expensive and does reduce the possibility of stress fractures. New rod bolts would be nice, but I don't know if they are sold separately. It might be possible to find suitable SPS-Carr or ARP replacements. Ooops I just took a closer look at the rod bolts in your image. You could most likely get nuts but not much chance for the bolts.
cheers
Blair

[Maelstrom]

EC
Another 2 cents.
Might be old news for you but communication being what it is via web forums
With regard to cylinder heads; I used to work with a highly experienced cylinder head specialist. I would give him a standard head and cam lift figures. Then he would test it on his flowbench. When finished we would sit down and talk about what it does, what we would like it to do, and what might be possible. Then we port it and retest on flowbench. From there I could think about camshafts, intake and exhaust systems that could match up with our plan. A large part of my racing successes was due to his excellent work. Of course, like a lot of the best guys in this industry in Australia, he got fed up with dealing with numpties, so he threw in the towel and got a well paying job as a sales rep. Cylinder bores are another topic that I could go on about ad nauseum but maybe when a thread opens up
cheerio

[Evilchicken0]

Cool, thanks for info.

I asked BDK about the crank yesterday, I'm not to sure what to do or what will happen. I remember the Performance Bikes 660 conversion and they ended up welding the crank. I guess I could run it on a 3HE CDI but I'd prefer a 4JH.

I've got a parcel from Fowlers .... costs are mounting and college days are numberred.

[Maelstrom]

When you said electrics I thought you meant the charging system as well, but you only want the ignition system from the 4JH. That means you only need to modify the existing part of the rotor that fires the ignition and adapt a 4JH pickup. Am I on the right track? Is this a possibility?

[Evilchicken0]

It goes back to what Alex saying the 4JH senses the crack position differently to the 3HE ... which would then follow that you wouldn't be able to use the 4JH CDI. I haven't checked the other forums so I'm not sure about this.
Odviously I'd like to jus take the 4JH charging / flywheel / pickup as an assembly and plonk it onto the 3HE crank.

"Hold on lads, I think I've got an idea"

What if - instead of making a spacer and attaching it to the 3HE crank I get a spacer and stick it into the 4JH flywheel ??? (Just like everybodies been saying but different)
I don't think the 3HE flywheel center can be put into the 4JH fly very easily. It might be I need to get a new center turned for the 4JH fly, but that's easier than machining the crank.

[hunter]

You could use the 3he flywheel,grind the trigers off and weld some new ones on,
It's the way i'm going to do it.