Technical > Project Progress

This winters work

(1/7) > >>

JOOLZ:
The XBR is in for the winter, it has now run a little over 3000 miles with the supercharger and I am giving it a partial strip down to make some changes and to inspect the engine to see how it is coping.
I replaced the cam chain to the original length item, I am raising the compression slightly (I have a little leeway built in) so raising it wont bring about nasty knocking, while replacing the camchain I had to remove the clutch so I examined the plates, no blueing or burning so the uprated clutch is holding out
The bore is a little more worn than I had hoped with no honing marks anywhere (there should still be visable marks in line with the low thrust surfaces in line with the gudgeon pin at this low milage) I suspect the extra heat is closing up the ring gap, I will have to grind the rings to make it a little larger, looks like that part came very close to failure and that would have blown the whole engine :(
I am going to do a bit more porting work on the cylinder head, mainly on the exhaust area to reduce pumping losses
There are a couple of small jobs to do, lower the forks in the yoke a bit, they have already been shortened but I recon I can also drop them 2-3cm and I am also going to raise the fairing by about 2cm

JOOLZ:
Working on the head now, finding another 4cc in the combustion chamber to get the compression where I need it with the added benefit of deshrouding the valves near the cylinder wall

JOOLZ:
The XBR is rebuilt, the head machining turned out well 3mm was removed from the combustion chamber which is now at 64cc as well as a 1.3mm lift on the barrel compression is 8:1 which is perfect for my use. I finally found and bought a belly pan that I liked the look of, its from a Mondial HPS 125 I just need to make some brackets and a few small mods to the pan then a spray

Moto63:
Look forward to seeing the belly pan in place Joolz 👍
Cheers, Michael

JOOLZ:
It shouldnt take long Michael hopefully a week or two

Navigation

[0] Message Index

[#] Next page

Go to full version