Post by: Stusmoke on June 14, 2012, 10:21:11 AM
To eliminate all confusion here, I mean a figurative ocean, theres no water. I heard this come up on another thread but I couldn't find it so I had to start another. Sorry. Whats everyones opinion? Time for a top end?
Post by: msmola2002 on June 14, 2012, 12:40:19 PM
But you said it had 200h on the top end anyway? You are lucky the thing has not had a piston collapse anyways. Yeah 2 strokes have less moving parts but they still need bits replaced from time to time.
Post by: msmola2002 on June 14, 2012, 12:53:24 PM
Quote
I'll have to get some. I'm rubbing engine oil on mine and its pain in the neck. I'll add it to my shopping cart.
Post by: Stusmoke on June 14, 2012, 01:01:34 PM
Post by: 2T Institute on June 14, 2012, 01:02:42 PM
Okay so its been getting worse. You know that sssssshhhhhhh noise you hear when you stick a sea shell to your ear? thats what it sounds like. A bloody ocean in my engine. Its been happening for a while but its been getting louder and louder.
How far from the ocean are you, just eliminating possiblities.
Post by: scotty dog on June 14, 2012, 01:06:47 PM
and if you think it goes now, wait till its all fresh
Post by: Stusmoke on June 14, 2012, 01:32:00 PM
Okay so its been getting worse. You know that sssssshhhhhhh noise you hear when you stick a sea shell to your ear? thats what it sounds like. A bloody ocean in my engine. Its been happening for a while but its been getting louder and louder.
How far from the ocean are you, just eliminating possiblities.
About 4 hours drive... I considered going to sleep to the sound of my bike running, the beautiful crashing waves
Post by: SachsGS on June 14, 2012, 03:03:10 PM
Crank bearings X2.I once worked on a YZ250 where the crank bearings seized and spun in the cases,not fun.
Post by: msmola2002 on June 14, 2012, 10:09:36 PM
Post by: scotty dog on June 14, 2012, 11:58:41 PM
Another possibility - did you have your wash plug in? could be water in the pipe. THat's very aquatic
You will be able to tell visually, at the top of the cylinder where the ring stops there might be a lip a couple of mil down from the very top, and also at the bottom, if the piston has been slopping around, you will see marks where the piston stops, and you will be able to feel that too. obviosly look for scoures and any chrome comin off.
Hope its all good for your sake Stu
Post by: Stusmoke on June 15, 2012, 12:20:00 AM
Nothing like a little "Dry" humour!
A little piece of me just died...
Another possibility - did you have your wash plug in? could be water in the pipe. THat's very aquatic
You guys are jerks
Post by: Stusmoke on June 15, 2012, 04:16:10 AM
Post by: Stusmoke on June 17, 2012, 08:05:00 AM
Also, what steps should I take to ascertain that it is most DEFINITELY in need of this and the shsssshshhhhh noise is a result of a tired engine? Which for the record, based on the condition I found the front forks in, I doubt has been taken care of well. If at all.
I know I'm being annoying and I'm sorry for that but I need to know, need to do it and get back to riding
Post by: scotty dog on June 17, 2012, 11:45:46 AM
If you have a bike shop close, some will remove ya flywheel and split ya case for 10-20 bucks.
Putting back together you might need a crank puller, which pulls the crank through the bearing if you put the bearing in the case first.
I have seen it done here by dogger, i think in his 2001 CR 250 engine build thread or somewhere else, not sure.
Have you googled how to do it? Surely theres a step by step vid or something out there in the www
Post by: Stusmoke on June 17, 2012, 12:02:39 PM
Cheers guys
Post by: msmola2002 on June 17, 2012, 12:25:53 PM
Piece of piss.
Post by: cnrcpla on June 18, 2012, 04:50:06 AM
Lets see some pics once you get it all opened up.
Post by: Stusmoke on June 18, 2012, 07:28:10 AM
Just helped a guy rebuild the engine from my old KX. Had bad crank bearings. Reassembled using an oven and freezer. Pressed the seals in with an appropriately sized socket then placed in oven, crank/bearings in freeze in freezer. Bearings plop into case. Case back in oven. Drop frozen crank into tranny side of case, with a feeler gauge of size I don't recall to keep crank clear of case. let it cool. then freezer. Then, heated a cheap socket with a blowtorch resting on centre of the other crank case's bearing til hot, and then popped onto frozen tranny/crank half.
Piece of piss.
Would I be correct in saying that the theory behind that is the metal contracting and expanding with the different heat? couldn't being heated to both those extremes weaken it?
Post by: msmola2002 on June 18, 2012, 12:01:09 PM
And no.
To anneal the steel in the bearings you would be up at least 600c, process annealing begins at 265ish. You don't crank the oven that hot. About 150c.
The bigger issue is not frying the seals, but they will be ok at 150.
Post by: eprovenzano on June 18, 2012, 01:15:44 PM
Post by: Stusmoke on June 19, 2012, 01:35:09 AM
Yes.
And no.
To anneal the steel in the bearings you would be up at least 600c, process annealing begins at 265ish. You don't crank the oven that hot. About 150c.
The bigger issue is not frying the seals, but they will be ok at 150.
Makes sense. Cheers for that.
Stu I rebuilt my son's Honda 400ex. I had helped a friend replace the crank on his KX125, so I did have some 1st hand knowledge, but it's not as hard as it may seem. My one piece of advice, as you remove things, nuts washers, gears etc., put a plastic wire tie on them to keep them together. Not only does it keep the proper components together, it keeps them in the proper order. Take your time, with some patience, (and a good manual) you can rebuild her. In the end, you will know her inside and out, plus you will have the satisfaction of knowing you did it.
Thanks Eric. I've been watching dozens of videos on it and it doesn't look all that intimidating. Better than a top end on a fooper right? I've got a good manual so thats a big hand and I have a system of writing out the part on a note pad, tearing the page off and putting all related bearings, seals, orings, nuts, washers etc on that piece of paper. I will definitely cable tie the gears and anything else that comes apart together. Thanks mate