When boring the cylinder what is the clearance between pison and cylinder
SOURCE: where can i get a
i believe it should be the same as a banshee you should be able to get from any yamaha dealer
SOURCE: Can I bore My 2001 yz 125?
It would be best to take it into a shop and have the machinist check it out before buying any parts, he should be able to guesstimate the amount of over bore required if it is at all possible, once you have this information, you can source the nessessary parts.
some of these type of parts are non returnable, best to play it safe.
hope this is of some help.
Ed
SOURCE: engine won't keep running
if it runs on starting fluid then stalls then its not getting gas. try cleaning all of the carb jets.
SOURCE: 87 yz 125t. bored .30'' over need 56.75mm Piston
yea, for most bikes they only come in .020 increments now. if your looking to freshen up the top end, then youll have to go to a 56.00mm piston. there will be almost no change in displacement or jetting from 55 to 56mm. if your replacing the piston, its best to have your cylinder bored anyways. since the worn cylinder walls may have adverse effects on the new piston rings, and they may wear a bit prematurely. a bore only costs about 30-40 bucks most places, and its cheap insurance. plus you will have the peace of mind knowing that your bore is matched specifically for your piston. I would definitely recommend a fresh bore.
SOURCE: Hi I am doing a simpile head & cylinder inspection
The diagram below should work for you. Put the piston on TDC. the OHC cam gear will have a single mark or may have two marks, see below. Be certain the front side of the chain is taut when mounting the gear. The cam chain tensioner keeps the back side taut.
It's a pretty big job. You need to be competent (and confident) with tools as well as diagnosing and repairing gas engines. Without knowing the details of your scooter, the overview is this: 1) Remove the carburetor (if mounted to the cylinder), exhaust pipe, cylinder head, cylinder and piston. 2) Have the cylinder bored out** to provide the correct clearance between the cylinder and the piston (if different from the scooter manufacturer's clearance this information should be provided by kit manufacturer). 3) Modify the head (more machine work to reshape the combustion chamber to work with the larger bore). 3) Reassemble. 4) Modify the fuel system (usually a carburetor) to correctly fuel the now larger displacement engine. 5) Get the new set up running and then tune it to run properly without damaging itself from an incorrect fuel mixture.
** Some cylinders are aluminum with a steel sleeve that forms the bore that piston runs in. Some are aluminum with a thin nikasil coating on the aluminum bore. These will be much more expensive to bore out as they will need to have the coating replaced after being bored out.
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