Hi all
Has anyone had the crankshaft lighten and balanced like Chris Applebee and did it make any difference
Thanks
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Crankshaft
- Alan H
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Re: Crankshaft
Chris Applebee balanced my 750 crank and it made no difference at all. Waste of time & money.
Proof that four strokes are over complicated
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- Location: Chicago
Re: Crankshaft
I would expect the pork chop effect would potentially improve performance if the motor was fitted with reed valves and a really good exhaust system, but on a stock motor, I would be very surprised if it made much difference.
The idea behind a light crank is that there's less inertia and that allows the crank to accelerate faster, but when the rest of the bike weighs as much as a pocket battleship, the difference will be tiny. IIRC, Barry Sheene tried lighter cranks in his XR11 (TR750) and went back to the heavy crank on fast tracks like Daytona.
The idea behind a light crank is that there's less inertia and that allows the crank to accelerate faster, but when the rest of the bike weighs as much as a pocket battleship, the difference will be tiny. IIRC, Barry Sheene tried lighter cranks in his XR11 (TR750) and went back to the heavy crank on fast tracks like Daytona.
- canaletto5
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- Location: Derbyshire
- pin
- Posts: 254
- Joined: Sun Oct 16, 2011 3:43 pm
- Location: greenford middx
Re: Crankshaft
That made me laugh
Think I will go with Barry Sheene it worked for him
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Think I will go with Barry Sheene it worked for him
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- pin
- Posts: 254
- Joined: Sun Oct 16, 2011 3:43 pm
- Location: greenford middx
Re: Crankshaft
Hi
The bike I have is a 750a does all the cranks fit all years
I’m thinking of buying one to get it rebuilt to swop over later
Thanks
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The bike I have is a 750a does all the cranks fit all years
I’m thinking of buying one to get it rebuilt to swop over later
Thanks
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Pin
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- Posts: 1620
- Joined: Thu May 03, 2012 12:58 am
- Location: Sunny Wales
Re: Crankshaft
Anything from L on will work.
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- Joined: Mon Mar 07, 2011 8:10 pm
- Location: Chicago
Re: Crankshaft
That's a great plan. And if there's rust or other damage that needs to be treated, the bike isn't spread all over the shop.
You could use a J or K crank and leave out the thrust washers inside the later style pistons, but L on cranks are better.
When the design changed, rods and crankwheels changed as well as the center seal. I have seen a couple of cranks with a mix of early and late parts and they came from bikes that didn't make it, so I'd stick with a 74 on crank.
You could use a J or K crank and leave out the thrust washers inside the later style pistons, but L on cranks are better.
When the design changed, rods and crankwheels changed as well as the center seal. I have seen a couple of cranks with a mix of early and late parts and they came from bikes that didn't make it, so I'd stick with a 74 on crank.
- pin
- Posts: 254
- Joined: Sun Oct 16, 2011 3:43 pm
- Location: greenford middx
Re: Crankshaft
Hi
Has anyone got a crankshaft I can buy
Thanks
Has anyone got a crankshaft I can buy
Thanks
- pin
- Posts: 254
- Joined: Sun Oct 16, 2011 3:43 pm
- Location: greenford middx
Re: Crankshaft
Don’t know if this could be the problem with the vibration I’m getting at about 3500 rpm,
Only look at one side but the exhaust hanger is in a sorry state,
Are they a easy job to do,
Thanks
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Only look at one side but the exhaust hanger is in a sorry state,
Are they a easy job to do,
Thanks
Pin