boring a compound angle in a block?

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shipto:
Its a Yamaha yz250 engine which I am shoehorning into a cheap chinese ?suzuko? frame and basically I am using what I have to hand as its a favour for a friend who doesnt like spending money :lol:
Although I do need to restart a different way as I worked out tonight that there is no way to bore this hole the correct angle without breaking through the sides so its back to the drawing board even though I managed to figure how to do it :doh:

Manxmodder:
I'm fairly familiar with Yam 2 stroke engines from past ownership.

What is the original Yamaha intake adapter made from? If it's ally then maybe you could cut the inlet part of and turn it 180 deg and re-weld.

If it is the nitrile rubber type inlet then perhaps a new one could be fabricated from tubing and sheet metal,tacked together with a mig and a bit of grinding and fettling to arrive at the desired shape.....OZ.

shipto:

--- Quote from: Manxmodder on October 16, 2015, 07:37:28 AM ---I'm fairly familiar with Yam 2 stroke engines from past ownership.

What is the original Yamaha intake adapter made from? If it's ally then maybe you could cut the inlet part of and turn it 180 deg and re-weld.

If it is the nitrile rubber type inlet then perhaps a new one could be fabricated from tubing and sheet metal,tacked together with a mig and a bit of grinding and fettling to arrive at the desired shape.....OZ.

--- End quote ---
Its the rubber one and funnily enough I have solved it exactly as you said, great minds think alike.. even though mine takes a while to catch up :lol:

Jonny:
I would beef up his frame as well.
Back in 79 was running 49hp with a KX on par with the 490 YZ in late 81.

Arbalist:
I've used this setup in lieu of a tilt and swivel vice.

I'd still like a T&S but they can take up a fair bit of your Z on a mill.

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