Maintenance & Technical > KX500 Original
Break In Secrets.
royceymon@hotmail.co.uk:
Hi Guys
i agree with the taking not too easy on the run in , ive always been brought up to believe if its gonna pop it will do it very early on ,on my 4ts it a cheap almost "cutting oil " otherwise running fully snynth from new/rebuild it will glaze the bore also running real slow will encourage a lazy motor .
on the 2t front i wouldnt run 32:1 , too rich for me 40:1 seems to work for me at the end of the day not only is the oil for lube but for cooling properties anything less than 40:1 and your asking for trouble. at the other end of the scale too much oil to extremes will run week(less fuel through the jet) the most important for me is good warm up from cold then at the end of the day 2t or 4t there racing bikes and within reason should be run accordingly.
i always make sure the ports on 2ts well chamfered/rounded seems to stop the scuffs to a certain degree ,alot of the pistons are mass produced id check for any rough skirts and overall quality before i pop the pot back on , i had my boys kx85 where the kips sliding bit hit the piston!!! worth a check me thinks..in 30 years only had one blow up and that was on a suzuki x7 when the crank snapped in half!!
jonny500:
royceymon, i have always been told to take it easy but usually cant control my self and give a fist full within the first 30mins or so to see how the motor is. i have never had a problem. so suppose i am in the middle some where on this 1. i am about to rebulid my k5 motor and the cost will be around the ?1000 mark for the motor alone. thats new piston, conrod, nicosil, mains and all bearings in the gearbox. i have uptill now been telling my self that when the time comes to run this in im gona have to control my self. what this guy says makes sense to me. but i know that when running an engine in the enemy is heat, when the piston is new it is bigger, there for more likley to nip up in the bore. my usual practice is the find a large area and get the bike in to top gear and run around in a massive circle at about half throttle trying to keep a reasonable load on the motor. the thoery being that i have lowish revs with a high speed so more air going through the rads keeping it cool. whats your thoughts on my method
by the way royceymon, your signature photo, is that donington
royceymon@hotmail.co.uk:
Hi Jonny
the photos an old one from cusses gorse , local track at salisbury( bout 4 years ago) tryied to chnge it to this resent one but couldnt work out how to!
yeah i think the larger the bore the hotter they get ,i would try to split it up into 15 min + runs alowing time to cool , on my old 2t i would wait until the pipe was warm before riding although not letting it idle as oiling plugs was a pain in the bum, running up and down the gears at various revs would be good top and slow could glaze the bore , i dont think giving it quick burst (when warm ) would hurt generaly i found you could feel if the motor was tight and didnt like to rev and just gave it a bit more time. making sure the ports edges are super smooth is always good on a big old 500 pot , i always prelube it all with 2t when building to make sure that first bang is lubed and not dry!
royceymon@hotmail.co.uk:
still having trouble with the photo!!
Goat:
I put close to $2000 into my engine last winter. Ran the crap out of it for 4 hours the first time out and still have the same compression now as I did when I put it together. I figure I have 100 hours if not more on it so far. Not a single problem.
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