KX Riders
Maintenance & Technical => KX100 / KX85 / KX80 / KX65 / KX60 => Topic started by: Saner on December 03, 2005, 08:47:01 AM
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So I think I may have blown my motor.. Was topped out in 6th gear when the engine went dead. I did a compression test and it had 115psi. How much am I supposed to have? I also checked ignition to make sure I have spark, and it did.
Thanks,
Matt
KX100
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You may have fouled a plug. I did the same thing on my 125. My bike was in desperate need of a new top in too. I thought I would just throw that out there since that is what happened to me.
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I tried changing the plug to a brand new one also, but it still didn't fire up. Thanks for the suggestion though. The search continues.
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It definitely could be in need of some new rings. Had a friends seriously punched out big-wheel KX80 do the same to me quite a few years back. It just felt like it ran out of gas, then it would just kick and kick and kick without even a sputter of life. Top end is very easy work, so if nothing else turns up then dont hesitate to pull the jug off. If you are the least bit mechanically inclined then you shouldnt have any problems. Thats the main reason I have stayed with a 2-stroke instead of getting the YZ426F I was considering about the same time these guys here got me sold on the KX500.
Oh yeah... one more thing... wide open throttle for too long is a really easy way to blow a top end. When doing long wide open runs, hold the kill switch for a few seconds every so often to let some fuel and oil cool the cylinder and lube things up real good. Then release the kill switch and get back on it and you should be good to go.
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GDubb, that's exactly what happened to mine. Went from screaming to instand dead. No sputter. I've rebuilt the top end of my jet skis, so this shouldn't be hard to do.
Good idea about the kill switch. Never thought about that. Guess I have a lot to learn.
Thanks for the help, GDubb. I'll let you know what I find. By the way, do you know what stock compression is supposed to be?
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Saner, now is the perfect time to install the kx500 motor, you will love the power.
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LOL 500 in a KX100 frame WAHOO
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That would be insane!! Believe me, if there was a way, I would do it in a second! The only reason I bought the 100 is because I can't touch the ground on 125's and up. I wish I could have at least the 125 motor in mine. Hmmm wonder if it would fit?
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There was one a 500 in a 80 or 100 frame on E-bay a while ago.
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Insane is ok ! Why do you think so many have KX500's ? There is no reason any sane person needs that much power. But then we look for ways to add power. What is wrong with us?
Actually a 125 should perk up your 100 quite nicely. I dont know if it will fit . Do the engines external shape look alike?
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That would be insane!! Believe me, if there was a way, I would do it in a second! The only reason I bought the 100 is because I can't touch the ground on 125's and up. I wish I could have at least the 125 motor in mine. Hmmm wonder if it would fit?
Here's your answer.
http://www.servicehonda.com/junior.html
Danger
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Here's your answer.
http://www.servicehonda.com/junior.html
Danger
"Prices start at just $8,999."
My wife would have the divorce papers signed, dated and the envelope would have a stamp ready, lol.
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Insane is ok ! Why do you think so many have KX500's ? There is no reason any sane person needs that much power. But then we look for ways to add power. What is wrong with us?
Actually a 125 should perk up your 100 quite nicely. I dont know if it will fit . Do the engines external shape look alike?
I agree. I would love to pack a 500 motor in my bike. As for the 125 shape, I'm not sure. I'm going to have to take a look at one and do some measurements. :o
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Here's your answer.
http://www.servicehonda.com/junior.html
Danger
"Prices start at just $8,999."
My wife would have the divorce papers signed, dated and the envelope would have a stamp ready, lol.
I think they tack on 2 grand because the bike has wow factor.
Danger
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I think they tack on 2 grand because the bike has wow factor.
Danger
Definitely.
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My brand new 04 kx500 was half that price. But I wouldnt mind having a red 500 as a back up unit.
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Ahhh the red ones are nothing much without the KIPS valve. For me that is the secret to a brilliant allround super offroader. Green is King Long Live Green!!
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You got it, Tim!
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Wow? Where? Its only a crf250. I dont see the big deal. Maybe if it had the 450 it would be wow... but its just a glorified 125 to me. Its kinda like the CR500AF to me... a status symbol. But the way I see it is what good is a status symbol in a sport where it all depends on HOW you ride, not WHAT you ride. Just my $.02... got change?
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The thing is an 80 cc frame, you know a pit bike, real small. With the 250 motor it has a power to weight ratio close to the K5. And yes it's one of those bikes for the guy who has everything (money to burn). It's a bike a Jay Leno type person buys 10 of, so when his friends come over they can tear 'em' up.
Danger
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I thought thats what the CRF50s were for? A few friends, a few 50s, a few beers, and a backyard mini-moto track sounds like a great time. A few beers and a CRF250 in an 80 chasis and some of my friends would be a good recipe for a funeral. Also, it seems that if they were gonna put a CRF250 engine, in a smaller, cheaper chasis, then they would price it somewhere between the cost of a CR80 and a CRF250. Not a couple grand more than either of the two. I must admit, I bet that thing would be a blast to rip around on being that it as a pretty peppy new 4stroke.
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My buddy honed my cylinder last night. Thankfully the damage wasn't so bad that it wasn't necessary to bore. Now I'm just waiting on my piston, rings and gaskets... Not that I'm in any rush since there's a foot of frozen snow on the ground. Anyway, thanks for all your help! Cheers!
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Did the piston skirt gall ? Did the rings freeze into the piston ? I reread the threads and the failure results were missing. I am glad it is very easy to fix. Are you going to use the Kx cast piston or aftermarket forged piston ? What kind of wax is on your snowboard ? LOL
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Yes, the ring froze to the piston. I bought a Wiseco piston, and I use Swix Wax.
LOL
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Swix HF8 for me this weekend. High FLouro for "wet" snow. 8 for the current snow temp. I have used Wiseco for every two stoke rebuild and never ever had a piston problem. I also make sure they are very close in jetting and always overrev the crap out of them. But thats just me. LOL
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This was the bike that was on Ebay a while ago, I saved the pics cos I was impressed by it.
As far as I remember its a KX80 with a 550 big bored 500 engine shohorned into it :-o
(http://www.visordown.com/forums/attachment.php?attachmentid=68073&d=1145263868)
(http://www.visordown.com/forums/attachment.php?attachmentid=68074&d=1145263881)
(http://www.visordown.com/forums/attachment.php?attachmentid=68075&d=1145263894)