Maintenance & Technical > KX500 Original
2000 KX500 - New to me.
wierdo:
I had the same problem, just cut out on me, looked at every possibility, fuel, elec, piston rings etc. had me stuffed what was wrong for ages kept having to tear down the top end to try and find the source. every thing looked fine every time,after reassembly motor would kick over then die. problem was the head studs would torque to specs but would stretch at start up, check all the studs againsta steel rule if its stretched you will see it as plain as dogs balls. ended up making new studs from some grade 8 bolts from the local caterpillar dealer and installing time-serts into the barrel. never reuse studds more than a couple of times especially on any motor thats making any sort of compression.
Hope this helps.
Weirdo.....
Friar-Tuck:
Hey Weirdo Thanks for the Info.
--- Quote ---check all the studs against a steel rule, if its stretched you will see it as plain as dogs
--- End quote ---
You place the rule on top of the cyl where the stud exits the barrel right? The stud pulls up, and the material surrounding the stud "crowns" (for lack of a better term) and forces the head up.
This has occurred more commonly in higher performance applications that I am aware of.
The only way to combat this is I know of was to countersink the stud holes.
Tuck\o/
duner04:
--- Quote from: Camo on August 22, 2011, 10:50:49 AM ---It ran strong at the beach. Wheelies in every gear. Kick me off the bike when starting if I didn't follow through properly. Start and idle with it crisply pounding. No odd noises other than the normal vibration. There is no way my nephew rode it in the woods harder than I did in the sand. He ran the premix I mixed for him before I left. Maybe the fuel was bad and it detonated? Had that before in my sleds. The fuel was 3 weeks old 93 premium mixed with 108 race 50:1 with synthetic Amsoil oil. Hmmmm. I'll have to go home and investigate I guess. I wonder if the crank seal went. Plug looks decent from what my Dad said.
--- End quote ---
did the 93 premium have alcohol? alcohol doesn't mix well with 2t oil. One our local vintage racers lost a Husky 500 topend when he mixed the alcohol premium with his race fuel, he had never mixed the 2 before. ethinol fuel deteriorates much faster, too.
Motorrad:
--- Quote from: duner04 on August 27, 2011, 07:33:10 PM ---
--- Quote from: Camo on August 22, 2011, 10:50:49 AM ---It ran strong at the beach. Wheelies in every gear. Kick me off the bike when starting if I didn't follow through properly. Start and idle with it crisply pounding. No odd noises other than the normal vibration. There is no way my nephew rode it in the woods harder than I did in the sand. He ran the premix I mixed for him before I left. Maybe the fuel was bad and it detonated? Had that before in my sleds. The fuel was 3 weeks old 93 premium mixed with 108 race 50:1 with synthetic Amsoil oil. Hmmmm. I'll have to go home and investigate I guess. I wonder if the crank seal went. Plug looks decent from what my Dad said.
--- End quote ---
did the 93 premium have alcohol? alcohol doesn't mix well with 2t oil. One our local vintage racers lost a Husky 500 topend when he mixed the alcohol premium with his race fuel, he had never mixed the 2 before. ethinol fuel deteriorates much faster, too.
--- End quote ---
What oil was he running and what race FuEl?? I bet the oil and race fuel were more to blame... Some oils don't like low S.G.
wierdo:
Hey Friar hows it goin? I had to remove all the studs and layed them against the steel rule to find the offender(s). But i also had the crowning issue as well, if you use time-serts to repair the threads, when installing the tools supplied will countersink the hole for you and the insert will sit flush with the barrel deck. I wont use helicoils anymore they are only marginaly stronger than the original threads cut into the alloy barrel, I have found the time serts to be a much stronger option. they also have the ability to be removed with a ezy out, pull it out and reinstall a new one, 2 minutes good as gold..try that with a helicoil..
Weirdo....
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version