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  #1  
Old 04-18-2011, 09:58 AM
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Exclamation KX65 Problems

I recently got a 06 kx65 for my step-son. I changed the gear oil out and added ATF-F. First I ran a flush to ensure all the junk was out. I mixed the fuel/oil at 32:1. He took it to his dads house and now it is knocking and sounded like the piston. He said it started fouling plugs and then just wouldn't start. His dad called me blaming me that it was the ATF in the case??? I would say this is a top end issue, not anything to do with clutch and gears right? I asked my step-son if it started smoking real bad or anything and he said no. Any help with this is appreciated.
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Old 04-18-2011, 10:02 AM
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There are quite a few people running ATF in the Cases of a 2 stroke so I would not say that is the singularity at all.

Get the bike back and have a look try the screw driver trick by placing a screw driver where you think the knock is and then put your ear up to it and see if you can isolate it.

If it is the top end it could be as simple as a rebuild for the bike.

Thanks
Scott
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Old 04-18-2011, 10:04 AM
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Thanks for the input Scott
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Old 04-18-2011, 10:06 AM
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I have am a step parent as well, I am fortunate that the bio-donor is not in the picture anymore.

So I know how frustrating this can be though. Just get the bike back and look at it first it could be as simple as a fuel issue as well especially as the bike started fouling plugs as well.

Thanks
Scott
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Old 04-18-2011, 10:57 AM
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my guess if all is as described that your stepson didn't notice it smoking. that is normal since he shouldn't be looking while he is riding. his father seems to be smoking for sure though. you pick the way. there is pretty much a zero chance that atf hurt the topend. there is also a good chance that his dad doesnt know what actual top end knocking sounds like.

do as suggested and get the bike back, and consider the pressure you got is backlash for something nice you did.

set the float. and take a listen. that topend comes apart faster than i can find a long screwdriver, and for the life of me have yet to meet anyone that can find anything I consider conclusive with one, but there are those who swear by it. then they take it apart to see if they were right
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Old 04-18-2011, 11:03 AM
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His dad has the bike and said he is going to tear it down. I told him to just let me know what he found. Thanks for the advice! I don't think he knows much about it though. I paid for a 125 extreme 4wheeler for him to race a couple years ago and his dad decided to put a big bore kit in it himself and blew it up.
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Old 04-18-2011, 11:56 AM
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Quote:
Originally Posted by rharkre View Post
His dad has the bike and said he is going to tear it down. I told him to just let me know what he found. Thanks for the advice! I don't think he knows much about it though. I paid for a 125 extreme 4wheeler for him to race a couple years ago and his dad decided to put a big bore kit in it himself and blew it up.

Nice!!!!! got to love that......

Good luck
Scott
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Old 04-18-2011, 04:02 PM
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You're a nice guy! I'm a step parent as well and I bought and LT80 and a CR80 for my 2 step sons. Both with different fathers, one is a real back woods kind of shade tree mechanic....his stuff breaks down all the time, and the other is a computer tech with clean and shiny small tools. My point is, I stand my ground when it comes to the toys I bought for the kiddos....if it breaks or just needs maintenance, I do it and the boys help. I don't let their fathers do anything for that very reason....they'll blow it up for sure.
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Old 04-18-2011, 04:46 PM
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Quote:
Originally Posted by CHRIS_NM1 View Post
You're a nice guy! I'm a step parent as well and I bought and LT80 and a CR80 for my 2 step sons. Both with different fathers, one is a real back woods kind of shade tree mechanic....his stuff breaks down all the time, and the other is a computer tech with clean and shiny small tools. My point is, I stand my ground when it comes to the toys I bought for the kiddos....if it breaks or just needs maintenance, I do it and the boys help. I don't let their fathers do anything for that very reason....they'll blow it up for sure.

Ouch I am the step dad too and the "computer tech with clean and shiny small tools" well network engineer.... Just cause I play with electrical bits (1010101's) doesn't mean I don't understand mechanical....

But seriously I think I would stand my line on this one and ask him to leave the bike alone and let you take care of it.

Thanks
Scott
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Old 04-21-2011, 01:31 PM
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Well it looks like he doesn't want to tackle the job. I got it back, the cylinder and piston are pitted pretty bad. The rod is also very loose on the crank. How hard is it to split the motor and get to the rod/crankshaft to change it out? I think I will just buy a new cylinder jug and rebuild kit for the top end.
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Old 04-21-2011, 02:35 PM
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Quote:
Originally Posted by rharkre View Post
Well it looks like he doesn't want to tackle the job. I got it back, the cylinder and piston are pitted pretty bad. The rod is also very loose on the crank. How hard is it to split the motor and get to the rod/crankshaft to change it out? I think I will just buy a new cylinder jug and rebuild kit for the top end.

I did a 1990 KX60 with the shop manual and I would not count myself as the most mechanically inclined person, only got the crank in backwards once had to take it apart again.

It was about a 4 hour job for me I didn't have all the right pullers and tools though and we had a machine shop press on the bearings and such due to lack of tools.

I would say that all depends on if your time is more valuable to you than the cost to do that. If I was doing it again I would take it to the machine shop, just because I can work a consulting gig for 4 hours and make enough to cover parts and labor for that type of job.

I evaluate all of the motor work that way and it has been the best way to decide. I usually call the shop find out what they charge and what the flat rate labor estimate is and I DOUBLE that amount of time for the calculation.

Thanks
Scott
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Old 07-04-2011, 07:09 PM
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my son has a 09' kx65 and i dont run atf in it, i run the lucas 10w40 semi syn. knock on wood, the bike is nearly 2 yrs old and i have never done anything to it or had any problems. we ride/race almost every weekend. i change the oil after 2 rides.

32-1 maxima , with a plug that is slightly hotter than the stock.
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