Question about Motorcycles
Was told not to hone cylinder when rebuilding because the cylinder is nickel plated.cylinder is not scored
Posted by Anonymous on
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Posted on Jan 02, 2017
Several possibilities, one or all could have happened. Low oil level, not changing the oil filter and oil when needed, wrong type of oil, Spark plugs with the wrong heat range, not using premium gas, oil pump problems, air leak in the intake leaning the fuel mix, poor seal on the head gasket, bad exhaust valve(s), timing is off and a few other things. What is listed are the usual things causing an engine to overheat. If fuel injected, get that checked too. It could be a lean mix there. In any event, overheating is the cause. Now just find out what caused the overheating.
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Posted on Jun 06, 2009
What is the compression on your scoot?
Honing is for small imperfections.If you can run your finger nail over Imperfection and it clicks or hangs up you need a BORE job..Honing is for very small issues. Seconhand parts also must be inspected and checked for wear.Mic the cylinder for proper specs. Please get back at me and Ill try to be of further service.
Posted on Jul 07, 2009
Most late modle MX & enduro (from about 1990 on plus some even earlier)
have what is called an electrofusion bore.
This is a very thin plating on the alloy cylinder. They use this so as to allow heat to dissipate quicker & can run tighter piston cylinder tolerances for improved performance.
To answer your questions,
No, they can't be re-bored(like the older style steel sleeved bore bikes could)
Yes, they can be honed but it requires a special type of hone(finger type bottle brush style hone).
Pistons are available increasing in size by much smaller incriments than the old style & are usually marked A,B,C,D(as the coating is much thinner than steel sleeve).
If it is scored very badly & you can see alluminum spots/scores anywhere on the cylinder surface there are several ways to deal with this.
Here in Australia there is a company(electrocill) that can re-cote the cylinder which is much cheaper(plus thicker & stronger) than replacing the barrel
If you have a cylinder re-coated It has to have all studs, seals & power valve assemblys removed.
You would also need to supply(or have them supply) a new piston in order for them to set the correct clearance.
Also here in Australia you can have most of the common models fitted with a sleeve & this gives you the abillity to rebore in the future.
In the U.S this company is known as Wisco(serco in Aust.)
It is worthy of noting that the piston rings are not interchangable between an electrofusion & steel type cylinder.(so if you opt for a re-sleeveing any spare rings from your spares kit ar of no use).
If you need a lead on how & if these services are available in your country(if your not in Australia) I suggest taking a look in the classified section of your local dirt bike magazine.
The trick is to undertake regular srevicing of your air filter(this is A MUST),oiling it properly with propper foam filter oil, useing a top quality 2stroke oil(motul,syn-lube for eg)
& regularly inspect & replace rings/piston as needed to get the best life from electrofusion or steel type bores
Hope this explains it all for you
Regards Andrew Porrelli
Posted on Dec 07, 2009
You mean cylinder jug? You don't hone the heads, but they do have special tools for polishing the valve seats. Usually they just spin the valves with a drill motor and some grinding compound to get them to seat tight, water tight. The jugs are honed out with a big brush that looks like something a chimney sweep would use. It has polishing stones on the ends of the bristles. but, they do that after the jugs are bored, they have honing stones for crosshatching the bores, kinda smooths them out. If you don't bore out the cylinders, use one of them. Check it out.
Posted on Jun 17, 2010
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