I hope you keep the tutorials coming. Thank u man I just purchased my 2000 kx500 and first time ever digging into my pwk 168 mj 52 pilot no idle 1000ft Oklahoma no more surging. I dang near bought a smart carb. Glad I didn't. I believe the pwk 39 is a great carb
@@clarkrupp Wow. Awesome stuff. Just turning 50 and have been talking about a 500 2stroke for 30 plus years that my wife finally gave in. It was on my bucket list. Also got a 2016 KTM 500 6-day. Too busy to ride much as well.
great video. Just one small critique. just a little bit of bad information when it comes to the needle valve numbers and position. the third clip is the stock recommended setting. And the numbers start at the top clip position being number 1, and go down through five as the needle gets richer just like the rest of the Jets get larger as the numbers increase.
You're right. I noticed that too. Important for a feller like me at 1,850 metres/6,070 feet to get the jetting right. Mine is an '87 with a Mikuni round slide carb. Have just moved clip to try out a new neeedle position.
that is some creative reasoning you came up with. some good books on the topic are "A Guide 1.1 to the choice, setting and use of tapered-needle motorcycle carburetors (Dellorto)" and "Mikuni VM Carburetor Super Tuning Manual"
Hi Clark, I am running a kx500 myself. It is all running nice, have a cast iron liner which has been re-board one size up from standard, when I go down the road and get it high up in the rpm I have a little miss fire, at a certain rpm. I haven't tried anything yet, the carb was fully clean before I put it back on, so I think I might try some new reads, what do you think? And might try your jetting. Gav
i had to buy a new carb because of the needle jet wear. they come with the "air guide" wings now. do you know of anybody who used this style and did it affect what kind of idle jet or slide or needle the bike "liked" or do they seem to meter the same with the same jets?
50 to 1 is too lean.. I wont run an engine that lean with oil especially with the heat those engines generate.. your looking for a seizure with that ratio..
We're talking 100% synthetic 2 stroke racing oil here...... 20 years of KX500 ownership and racing. When complete engine tear downs are done the entire bottom end looks like someone just used a paint brush to cover every surface. Use high quality oils and follow the manufacturers recommendations.......... 50:1 under race conditions has never been a factor for me.
Excellent post thank you
I hope you keep the tutorials coming. Thank u man I just purchased my 2000 kx500 and first time ever digging into my pwk 168 mj 52 pilot no idle 1000ft Oklahoma no more surging. I dang near bought a smart carb. Glad I didn't. I believe the pwk 39 is a great carb
Thanks. This was great help. Just got a 2000 kx 500
Enjoy ! Hard to kill these things...... I keep two of them around - just becasue ..........
@@clarkrupp what years?
@@Kevin.Andrews I've got a '93 and an '01 and a Husky 501 plus a Beta 300 and a big bore KLR 705 and a 1400 Concours and no time to ride !
@@clarkrupp Wow. Awesome stuff. Just turning 50 and have been talking about a 500 2stroke for 30 plus years that my wife finally gave in. It was on my bucket list. Also got a 2016 KTM 500 6-day. Too busy to ride much as well.
Just picked up a mint 93 kx500 ,what would you run for jets?half year of winter half year of summer pretty much in Massachusetts for ya lol?
good solid advice, thanks for the video
Good info. Hoping for a good winter so I can dial my ice bike in a little closer.
Great job on walk us threw that carb info. Braaap!
great video. Just one small critique. just a little bit of bad information when it comes to the needle valve numbers and position. the third clip is the stock recommended setting. And the numbers start at the top clip position being number 1, and go down through five as the needle gets richer just like the rest of the Jets get larger as the numbers increase.
And he's backwards on his air screw, back it out and it gets richer
You're right. I noticed that too. Important for a feller like me at 1,850 metres/6,070 feet to get the jetting right. Mine is an '87 with a Mikuni round slide carb. Have just moved clip to try out a new neeedle position.
@@petergarratt9645 how is more air richer? tell us how that works.
@@amcgee-dl3cj bernoulli's principle, the increased air allows the circuit to pick up substantially more fuel
that is some creative reasoning you came up with.
some good books on the topic are "A Guide 1.1 to the choice, setting and use of tapered-needle motorcycle carburetors (Dellorto)" and "Mikuni VM Carburetor Super Tuning Manual"
Hi Clark, I am running a kx500 myself. It is all running nice, have a cast iron liner which has been re-board one size up from standard, when I go down the road and get it high up in the rpm I have a little miss fire, at a certain rpm. I haven't tried anything yet, the carb was fully clean before I put it back on, so I think I might try some new reads, what do you think? And might try your jetting. Gav
Hey, question for you. Should the pilot (slow) jet be as hollow as the main jet?
You mean look through it ? Yes, but its awfully small so it's hard to see through but the tiniest of debris can plug it up.
@@clarkrupp yep. Your right. Blew some air through it and now I can see that small hole. Must have been clogged. Thanks
i had to buy a new carb because of the needle jet wear. they come with the "air guide" wings now. do you know of anybody who used this style and did it affect what kind of idle jet or slide or needle the bike "liked" or do they seem to meter the same with the same jets?
50 to 1 is too lean.. I wont run an engine that lean with oil especially with the heat those engines generate.. your looking for a seizure with that ratio..
We're talking 100% synthetic 2 stroke racing oil here...... 20 years of KX500 ownership and racing. When complete engine tear downs are done the entire bottom end looks like someone just used a paint brush to cover every surface. Use high quality oils and follow the manufacturers recommendations.......... 50:1 under race conditions has never been a factor for me.
Agreet motul 800 or equivalent will keep you more than covered @ 50:1
NEGATIVE, I have Been Racing and Riding KX500's for twenty plus years. Golden Spectro 50:1 NEVER EVER have has any top end issues.
50:1 h1r or motul 800 never fouled a plug or roasted a piston iv been racing/desert riding the same kx 500 since new in 2001
everbody is an internet mechanic!!!!! LOL...
Lot's more info on the K5 =) KXriders.com & KXGuru.com