441 needle position

Fast Eddie · Dec 30, 2023

When it comes to serviceable items like needles and needle jets, my mantra is: if in doubt, renew.

The potential time lost in chasing your tail trying to eradicate abnormalities caused by such items being worn is simply not worth it.

If I was a pro working on someone else’s bike with unknown history, I’d be even more strict on this. You’d either pay for the stuff I say or take your POS / P&J (delete as appropriate) and waste your own time f*cking about with it !!

Perhaps that’s why I don’t work in a customer facing role …?!

baz · Dec 30, 2023

Fast Eddie said:
When it comes to serviceable items like needles and needle jets, my mantra is: if in doubt, renew.

The potential time lost in chasing your tail trying to eradicate abnormalities caused by such items being worn is simply not worth it.

If I was a pro working on someone else’s bike with unknown history, I’d be even more strict on this. You’d either pay for the stuff I say or take your POS / P&J (delete as appropriate) and waste your own time f*cking about with it !!

Perhaps that’s why I don’t work in a customer facing role …?!

Apart from the fact this was covered in posts 2 and 3

With the poster replying it's all new stuff

kommando · Dec 30, 2023

baz said:
When you mark the throttle you may find you actually ride at quarter throttle or much less in every day riding

Which is why the needles and the needle jets wear out so much, well the jet well before the needle.

kommando · Dec 30, 2023

seattle##gs said:
How does it get oil on the left side?

The head to barrel joint has two oil drain holes on the left that continue down to the barrel to crankcase joint, they are small holes and can leak from both joints. When it leaks the air flow and turbulence can push it into the oddest places but most likely on the left. First fix is to retorque the head, next is to removed head and barrel and rebuild with new gaskets, reannealed head gasket and better sealant plus some prayers to the gods of Armoury Lane.

Triton Thrasher · Dec 30, 2023

hhh said:
Yes of course, but it's sometimes hard to know when that is. Plug gauges are not adequate since the jet wears oval. A gravity flow test might be the only reliable way, but just a percent can be significant, so it might be hard to get enough resolution.

I’ve never heard of anyone doing a flow test on a needle jet. You would have to do it with the parallel part of the needle in the metering collar of the jet. You would also have to have already done the test on new parts, so you can compare.

concours · Dec 30, 2023

Triton Thrasher said:
I’ve never heard of anyone doing a flow test on a needle jet. You would have to do it with the parallel part of the needle in the metering collar of the jet. You would also have to have already done the test on new parts, so you can compare.

I gage pin, held up to any light source will instantly show any obround profile to the hole. Chuck it over your shoulder, or not.
30 seconds.
Less time than typing about it.

seattle##gs · Dec 30, 2023

kommando said:
The head to barrel joint has two oil drain holes on the left that continue down to the barrel to crankcase joint, they are small holes and can leak from both joints. When it leaks the air flow and turbulence can push it into the oddest places but most likely on the left. First fix is to retorque the head, next is to removed head and barrel and rebuild with new gaskets, reannealed head gasket and better sealant plus some prayers to the gods of Armoury Lane.

GRRRRRRR.

Fast Eddie · Dec 30, 2023

kommando said:
The head to barrel joint has two oil drain holes on the left that continue down to the barrel to crankcase joint, they are small holes and can leak from both joints. When it leaks the air flow and turbulence can push it into the oddest places but most likely on the left. First fix is to retorque the head, next is to removed head and barrel and rebuild with new gaskets, reannealed head gasket and better sealant plus some prayers to the gods of Armoury Lane.

Sounds like a potential application for the .005” copper wire as demonstrated by Jim Schmidt ?

seattle##gs · Jan 7, 2024

Fast Eddie said:
Sounds like a potential application for the .005” copper wire as demonstrated by Jim Schmidt ?

that sounds like a good idea

441 needle position

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