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piston to bore clearance
Posted: Mon Jan 21, 2013 4:08 pm
by handofdave
would an excessive piston bore clearance of 0.3mm cause my bike not to start from cold?
Re: piston to bore clearance
Posted: Mon Jan 21, 2013 4:26 pm
by bristolmod
I would think so as its twice the max allowable clearance. I assume the ring gap is also excessive as well? Is there rather a lot of piston slap when you get it to run?
Whenever I get a cylinder rebored, I go for 3 thou (in old money)
Chris
Re: piston to bore clearance
Posted: Mon Jan 21, 2013 5:35 pm
by handofdave
new rings but gap is excessive,would the wear stop the engine from sucking the fuel in,when i finally get it running and warmed up it starts first kick when hot,by the way it is a short rod suzuki
Re: piston to bore clearance
Posted: Mon Jan 21, 2013 6:56 pm
by ArmandTanzarian
handofdave wrote:would an excessive piston bore clearance of 0.3mm cause my bike not to start from cold?
You probably know this but I'll mention it anyway because I didn't. If you check the clearance with a feeler gauge, remember to halve the value because the other side of the piston will be touching the cylinder.
Re: piston to bore clearance
Posted: Mon Jan 21, 2013 6:58 pm
by Muppet
so im lookin at 12 thou feeler for 6 thou cleerence?
Re: piston to bore clearance
Posted: Mon Jan 21, 2013 7:17 pm
by handofdave
ArmandTanzarian wrote:handofdave wrote:would an excessive piston bore clearance of 0.3mm cause my bike not to start from cold?
You probably know this but I'll mention it anyway because I didn't. If you check the clearance with a feeler gauge, remember to halve the value because the other side of the piston will be touching the cylinder.
no i didnt know that,thanks for the info,so the clearance is 0.15 would that stop it from starting?
Re: piston to bore clearance
Posted: Mon Jan 21, 2013 8:04 pm
by wack 63
The cold weather certainly wont help.Once the fuel hits the cold engine parts it's likely to condense and introduce water moisture into the cylinder which won't help starting.
Re: piston to bore clearance
Posted: Mon Jan 21, 2013 9:39 pm
by camel
ArmandTanzarian wrote:handofdave wrote:would an excessive piston bore clearance of 0.3mm cause my bike not to start from cold?
You probably know this but I'll mention it anyway because I didn't. If you check the clearance with a feeler gauge, remember to halve the value because the other side of the piston will be touching the cylinder.
Why would you half the value?the clearance is the difference between piston and barrel.not half the difference
Re: piston to bore clearance
Posted: Mon Jan 21, 2013 9:42 pm
by camel
Muppet wrote:so im lookin at 12 thou feeler for 6 thou cleerence?
No a 12 thou feeler gives you 12thou clearance
Re: piston to bore clearance
Posted: Mon Jan 21, 2013 10:04 pm
by Muppet
camel wrote:Muppet wrote:so im lookin at 12 thou feeler for 6 thou cleerence?
No a 12 thou feeler gives you 12thou clearance
are u sure
what if I hold the pot upside down and measure it left handed
