Big bore xbr

[JOOLZ]

Still looking for a piston. The 3 hardest bikes to start have been my old sr 500 10:1 compression and no decompressor fitted, my tribsa twin 12:1 and a manual advance retard and my jap 500 15:1 thankfully no kickstart but involved me jumping up and down on the seat as hard as I could while being pushed by a mate, I once made the mistake of wearing some baggy trousers while starting it and as I let my full weight down on the seat my nuts sort of swing under me and that was it, me and bike in snotty heap, bike undamaged but I thought I was

[blew]

If you have the XL piston,I suggest you fit it,unless you are trying to squeeze as much as possible out of the engine.

[JOOLZ]

Im not looking for maximum power but I am looking for an engine with the best mid range torque,and spread of power so I need the piston to compliment the new cam that im getting ground at joy engineering, and the headwork that I have already carried out really looking for a minimum of 10.1 compression ideally 11.1 or there abouts 

[blew]

I have no idea what the cr of my engine is,but I'll be surprised if its less than 10:1 on the XL piston.

[JOOLZ]

I have my piston, I opted for a rebore and oversize piston so now its 601cc, the bike comes off the road today for a full strip down, frame repaint and the engine work. Its been 2 years since the frame was painted and I have noticed a few rust spots which I want to keep on top of,

[JOOLZ]

I have to recommend Eastwood racing they were very helpful, supplied the piston and did the rebore by return of post, so didnt have to wait long at all

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[themoudie]

Aye Joolz,

Pleased that worked out for you. Hope the strip and build goes well.

Remember Vic Eastwood racing on those early XT's with special frames and breathed on motors. Lovely, smooth, quick style and grand bark of the motor.

Cheers, Bill.

[guest564]

With the amount the kickstart swings out from the bike,when I really give it my full weight,the bike tilts sideways.

Mine is an ex-race bike with fixed foot rests so I can put an axle stand under each one to keep it upright. The electric start works OK but it needs a booster when its cold.