Question about 2005 Honda CRF 230 F

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It simply sounds like a ticking from the engine, i am not sure wear, i have replaced the cylinder jug, piston, pistion rings, pistion rist pin, and the seals, what could be the ticking??

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  • Honda Master
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The bearing shud be tested or inspect valve system--try using a stethiscope to listen for noises elsewhere

Posted on May 06, 2010

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Motorcycle is losing compression and noisy


if it is a water cooled engine the ring gap at the bottom of the cylinder should be around .010"
rings have to be installed the correct way up or the compression doesn't help push the rings against the cylinder walls for effective seal
piston skirts will touch the cylinder walls as the pressure pushes the piston to one side as it pushes the piston back down the cylinder
I have to ask did you put an old piston back in the new cylinder
was the new cylinder standard size or over size
what was the ring gap before you fitted them to the piston
did you use new rings or the old ones --maximum rin gap is .025"
rings don't wear in , just wear out
why did you replace the cylinder in the first place
was it because of low compression or taper wear
as silly as all this seams it is all very relevant to your question

Mar 11, 2016 | 2011 kawasaki KLX 250

1 Answer

How to change piston on Jonway 50 cc 2012


Air cooled 50cc motors usually have 4 long bolts holding the head on, they go up through the 'jug' and through the head to bolts under a decorative cover or just out inthe open. remove nuts or entire bolts and then use a mallet to whack the 'jug' (cylinder) to break it free of the lower gasket, pull jug up and off piston, remove old piston by circlips or other retention and install new one. pinch rings and work jug back over piston, lower onto case gasket (if you didnt rip it removing it) and button back up. Check cylinder before replacing piston to make sure a new one will work. If the walls are scored, you will have to get it bored and use a +.25mm piston.

Aug 18, 2015 | Jonway Motorcycles

1 Answer

Engine tick


It could be a gudgion pin on the piston that is loose and touching the cylinder wall. It could also be the beginning of a piston and bearing failure. If it is a diesel engine check the injector.

Dec 04, 2013 | 1999 Jeep Wrangler

1 Answer

Engine is ticking took it in they said it maybe a cracked ring ride it and see if it gets louder?if i do have to have it replaced can i grt them to bore it out for more horsepower ?


Yes, you can possibly get them to do that, but normally they will install a big bore kit which consists of new jugs, pistons, pins and rings.

Oct 22, 2012 | 2002 Harley Davidson FXDL Dyna Low Rider

1 Answer

Bad pistions on 94 buick centry 3.1l think engion stamp is g dont know if i have to put just pision in or rod assambly


It's rare that a piston goes bad. So, you need to determine why it failed.
Most times, the cylinder wall is damaged during a piston failure making it impossible to just replace the piston. Check the wall for score marks and out of round condition as well as actual size VS original bore size. (correcting that requires machine work) The new piston must match the cylinder bore as it is now, NOT what it was when manufactured. (same applies to rings).
The old rod can be re-used if it is not bent and providing that the big end (crank end) is still round. Again, the rod needs to be assembled by a machine shop as the wrist-pin is a press-in part.
Most times, you will find that the amount of actual work necessary to replace one piston exceeds what would be necessary to replace the engine in both time, $ and reliability.
If you want to try a replacement though, see if you can get a piston/rod assembly that is still in good condition from a blown junkyard engine, Plasti-gage the bearing and replace if necessary, clean out the ring grooves or replace the rings. Use a hand held cylinder hone and break the glaze on the cylinder walls. If you are careful and everything goes well, it MIGHT work.
Personally I would never replace pistons in an engine without doing all the necessary machine work though.

Aug 22, 2011 | Buick Century Cars & Trucks

1 Answer

Jugs leaking


I assume that the leak is at the bottom of the cylinders. This is a common problem not only on the Evolution Sportster, but on the Big Twin Evolution engine as well. To fix the problem, you'll have to pull the heads and the cylinders off. Replace the cylinder studs in the cases as Harley has come out with a better stud since this engine left the factory. Replace all the gaskets and torque the heads as described in the service manual. There is a special torquing sequence on the heads on the Evolution Sportster engine. While you have the engine down, check the cylinder for wear and either bore the cylinder and install new pistons or if the wear is within service limits, simply break the glaze in the cylinder and install a new set of rings.

Good Luck
Steve

Jul 06, 2011 | 1993 Harley Davidson XLH Sportster 883

2 Answers

My mitsubishi canter 4d32 engine had all its 4 top compression rings broken ie one from each bore what can possibly cause that and what amount of smoke or mist should i expect from the breather after...


As an engine wears the ring lands on the pistons wear also. In addition to ring land wearing on the piston, the bore in the cylinder develops a wear pattern. Has the engine been rebuilt?
If the pistons have worn ring lands and were re-used it may allow the rings (new or old) to twist in the grooves and catch on any ridge in the cylinder, thus breaking them.

When the engine is apart you must check for proper ring land wear. You need to consult the piston manufacturer for proper wear specs, typically around 0.006in.

If you're getting a visible amount of smoke/oil from the breather after the rebuild something is not right. The rings are not seating. I would definitely recommend boring/honing the cylinders and going with a new set of pistons/rings so you don't have to pull it apart again. A little more now can save a lot in the long-run.

May 06, 2011 | Mitsubishi Pickup Cars & Trucks

2 Answers

Im putting my 05 yz 125 top end back together my question was what is the torque specs on the head and on the jug


G'day. The torque specs for the 8mm head bolts is 18ft/lbs.the jug?(cylinder or barrell) is just tightened down even & firm, as there is no acess for a torque wrench.
OK. other things to note.
Clean the cylinder first in solvent(kero or fuel).Then in warm soapy water in a bucket. Dry-(compressed air is best for this-wear eye protection).once dry lubricate all power valves with oil.
Using a clean white rag-soak the end in your 2 stroke oil & wipe the inside of the cylinder surface untill the rag comes back clean(you will need to do it a couple of times-turn the rag over & do it again).Lube the new piston just before assembly-Also pour a little oil down the main bearing oil holes & over the big end too.
Other things to be sure of are-
Piston on the right way round-arrow to the exhaust.
Rings right way up. Some 2stroke dirtbike rings will only go one way up.Look CLOSELY at the ring ends-on the upper or lower surface there may be an etched dot or "T" or "N" or other marking. the mark goes facing up(on both rings unless single ring piston).
rings positioned with end gaps over the locating pins(the ring grooves have a pin in them to stop the ring turning)
Piston pin clips in correctly.
Powervalve moves freely.
Again-watch when you fit the cylinder-it can be tricky to keep the ring end gaps over the locating pins as you feed the cylinder over the piston.
Hope this all helps
Regards(done this a thousand times)Andrew Porrelli

May 04, 2011 | 2003 Yamaha YZ 250

2 Answers

Husqvarna 141 piston ring, what is the required gap for the ring? Also, does it matter which way the piston is positioned in the cylinder, there is no arrow or difference that I can tell by looking at it.


It's been a few years but I've installed piston rings in many small engines. Many rings are beveled or rounded on the top outside to prevent excessive cylinder wear or scaring the cylinder wall. The bevel should be very slight and very hard so see. Some may have a small dot or marking cast into the ring near the end/split. If that is the case the ring should be installed with the marking turned toward the cylinderhead. Hint, lube the piston, rings, and cylinderwall before installing the piston. Gene

Jun 27, 2009 | Husqvarna Chain Saw 20" Bar

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