1010cc cafe racer

[TwoManyXS1Bs]

If you haven't considered it already, the hi-ratio primary may reduce load on the kick starter.

Fyi, here's some head cutaways showing the steel combustion chamber insert:

 

[JohnGoodenough]

Thank 2many!
I had no idea.

Seems the steel is pretty thick.
What's your take on my pics?

Thanks again and happy new year!

 

[TwoManyXS1Bs]

I like the pics. Real interesting machine you've got there. Would love to see pics of head and ports after it's been disassembled and cleaned. Ditto on that crank...

 

[JohnGoodenough]

Don't plan on opening the bottom end yet, wasn't even planning on stripping the head.
But I suppose I'm gonna have to.

How will I know if they've ground too far?

From the cutaways you showed there seems to be quite a bit of 'meat' there, or should I just scrap it and start again?

Thanks again

 

[TwoManyXS1Bs]

...How will I know if they've ground too far?
... should I just scrap it and start again?

Don't know the history of the head. Could be some interesting port work in there worth saving. Won't know 'till it's stripped and cleaned. Then seats, guides, and whatever can be evaluated...

 

[JohnGoodenough]

K. Thanks.
Will strip, clean and post pics.
Happy new year all, and thanks for your patience...

 

[JohnGoodenough]

 

[JohnGoodenough]

Damn! No luck posting pics on my ipad, but lots of head pics in the album.

Still got to strip and clean, but there's plenty steel where the grinding was done.

Gonna be fine

 

[JohnGoodenough]

Oh. Probe ignition arrived today.
Looks great!
Also gasket set...

 

[JohnGoodenough]

Wolfie, where are you?
You managed to post my pics for me from my album!

 

[TwoManyXS1Bs]

I've run into this before with the pic insert routine. Changed album.php to picture.php

 

[JohnGoodenough]

New goodies arrived. Pics in my album of the same name

 

[JohnGoodenough]

Lots of new pics in the 'one from the vaults' album!

 

[TwoManyXS1Bs]

Looks like a busy/fun place to hangout. I don't see any serious porting work in the head, may have been cleaned/smoothed though. The intake isn't port matched to the carb holder/spigot. The exhaust valves look to be custom (flat-faced), and oversize.

 

[JohnGoodenough]

I spend way too much time there. And money.
My biggest fear is that my wife sells it for the price I told it's costing

Head still needs to be stripped.

I've never seen another head so I don't have any base to compare it to. Or anything else on the bike.

I'll post pics when the head is stripped.

We certainly plan to match the intake to the carb rubber thingies.

Thanks for all your input Twomany!

 

[JohnGoodenough]

More pics! Frame cut..

 

[JohnGoodenough]

New goodies in album of the same name...

 

[JohnGoodenough]

More new goodies!

 

[goodgollyjosh]

Looks like a busy/fun place to hangout. I don't see any serious porting work in the head, may have been cleaned/smoothed though. The intake isn't port matched to the carb holder/spigot. The exhaust valves look to be custom (flat-faced), and oversize.

Mine are flat-faced, but have the Yamaha logo. Did older models have a dish?

 

[TwoManyXS1Bs]

Mine are flat-faced, but have the Yamaha logo. Did older models have a dish?

Whoops! You're right! Got my engines mixed-up again !