2001037
ASH-BASH
wrote
Nov 25, 2010 at 1:14
Nov 25, 2010 at 1:14
The stroke is an upward or downward movement of a piston in a cylinder. In a petrol engine the cycle begins with the induction of a fuel mixture as the piston goes down on its first stroke. On the second stroke (up) the piston compresses the mixture in the top of the cylinder. An electric spark ignites the mixture and the gases produced force the piston down on its third power stroke. On the fourth stroke (up) the piston expels the burned gases from the cylinder into the exhaust.
1747417
kieran223
wrote
May 6, 2010 at 11:53
May 6, 2010 at 11:53
y is the giant still ur profile pic u dont have one any more
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bufers
wrote
Apr 21, 2010 at 23:51
Apr 21, 2010 at 23:51
Plus if u think biking is for 6 year olds why the hell are you on this site, think you need to piss off mate! This is for biking people not pikey people who don't like biking! Ohh and why havnt u got any pics of yourself on here! Calling me a fat f*ck when those no pics of you on here! Too scared to put any pics up! Probably cause ur 12! Or some skinny little runt with out a life!


Totnes, United Kingdom 
WELL over priced















Nov 25, 2010 at 1:19
excessive overlap gives a lousy idle and can cause starting problems.
Large amounts of overlap are usually associated with poorly designed cylinder heads and high revs.
Valve Lead is the amount the valve opens before the piston arrives at Top Dead Center. the valve does not open until after the piston has passed TDC.