[maduncle]

Sad thing is - so many folk don't know they are hacking up a black bomber until after.

 

[maduncle]

Put a call out on Facebook for some hipster who has hacked the back end off his bomber to weld in a 'tail hoop' and see if you can get the original piece back. That is exactly what I did (mind you I knew a guy who was doing this already) and I got my race frame back to stock.

 

[maduncle]

I have a bomber triple tree if you want to run stock front forks, otherwise if you use the 500T triple and forks you can swap and spin the forks and run the brake calliper at the rear of the disc on the right hand side.

 

[maduncle]

Interesting stuff - I am busy building and learning.

I am running 74mm pistons, having first pulled the stock sleeves out of the barrel, then had the barrel bored out, then had Wiseco big bore sleeves inserted, then had the Wiseco sleeves bored out to take the 74mm pistons - therefore giving me 2mm plus of sleeve wall. I preferred this to boring out the stock sleeves and running with 1.5mm or less of sleeve wall. I also had to bore out the upper crank case to take the ends of the Wiseco sleeves.

My head has been ported, polished and fitted with THR valves, and I am running Megacycle 'mild grind' cams so I can stick with torsion bars.

My cylinder has no base gasket (only threebond gasket cement) and I will be running a copper head gasket from THR (I think it is 1.5mm thick?).

The barrels are torqued down and the edge of each piston finishes dead flush with the top of the barrel on rotation of the crank.

After all of the calculating and allowing for .96mm stretch in the connecting rods at full heat - I have quite a close tolerance, so it will interesting to see what compression I get!

 

[maduncle]

Yes - now you have a longer stroke engine, will you take it out to 73mm or 74mm in bore to square it up again?

 

[maduncle]

But can someone please tell what fenders are?

And where I can find the 'hood' and 'trunk' on a car?

 

[maduncle]

I haven't verified this yet, so it only a theory... Honda moved the wrist pin hole higher on the 500T pistons from the 450 DOHC pistons. The distance would be 1/2 the difference in the stroke. Cb450 stroke = 57.8; CB500 stroke = 64.8. 1/2 the difference is 3.5mm. This is assuming the same deck height. This way they could use the same rods. Back in the day, General Motors would do this. I know Pontiac V8 engines from 326 to 455 ci all had interchangeable rods. The bore and stroke varied. The pistons would not interchange even with the same bore.

You got me going on this. There might be a big engine in my future. Have you though about cooling? There were some big Triumph Twins back in the day. I have heard they would run hot.

What sort of cooling are you looking for JamesPal?

If you are talking oil - have a look at what Cappellini make for just this problem.

 

[maduncle]

Yep - it is starting to look like a nice old sedate bomber, which from the sounds of it will be a real 'wolf in sheeps clothing' if you do go the 600cc route.

 

[maduncle]

Good to see that UPS are consistantly crap at delivering parcels - they did the same thing to me a couple of weeks ago with that steering damper mount I bought off CMSNL.

The ride looked nice though..

 

[maduncle]

I agree with Ray.

Once you own a bomber, you do tend to keep a 'box of bomber bits' particularly the rare find new old stock parts, not so much because you need them but because one day someone else might.

For example - I have a bomber triple tree set hanging on the workshop wall, all polished up and fresh powder coat on the lower triple, just in case...

 

[maduncle]

Nice one Ronny, let me know if you plan to put the original steering damper assembly back in - I still have some new old stock parts to suit.

Do you have a frame number? It looks K0 to me with the tube steel rear pegs/exhaust mount on the frame, but they may have done that to K1 frames too - dunno.