Jetting!!! Again and again and again!

[alexander-vmann]

very possible...which way did you go with the jetting, richer or leaner?....and which jets did you change?

i switched from 170 and 60 to 165(?) and 58

[Foxx4Beaver]

check both the clamps on either side of the carb (airbox & intake) to be sure they're snugged up enough.

what was it doing to make you want to lean it out?
did you adjust the air screw after making the changes?
 

[alexander-vmann]

check both the clamps on either side of the carb (airbox & intake) to be sure they're snugged up enough.

what was it doing to make you want to lean it out?
did you adjust the air screw after making the changes?
 

it did nothing! i switched to bigger jets for the winter and now smaller for the summer, i did let it warm up a little before i set te air screw then  but since it idled to hig and i could not set down the ilde i set it in 1 quarter so that it would idle a little lower, today i turned the air screw out one 1 again and started it to see if it would idle wich he did at a low rpm to! but out of the exhaust comes cartoon styled smoke rings so does the air screw turned out make it richer?

[Foxx4Beaver]

so does the air screw turned out make it richer?

turn out to lean it...
turn it in to richen it.

[alexander-vmann]

so does the air screw turned out make it richer?

turn out to lean it...
turn it in to richen it.

the more i know

[Johnny 5]

86 500 , looking for starting point,mostly concerning needle.
This is a Mikuni carb. Was/is this stock for 86 ?
Owner bent original, then lost it
Parts place he went to said they couldn't get stock needle. So they got him a
6N1
6FJ6
6F15

Which would be closest to stock, and/or best to Start with with? Pro Circuit pipe and aftermarket air filter are only mods.
Also, what fuel and mix ratio is recommended? Getting close to firing this beast up !!

[Foxx4Beaver]

the stock needle for that bike was 6J6-2...
as for which one is closer to stock, kinda hard to say without having a stock needle to measure, to compare to the three others.
I myself would just pick one (like the 6F15), and put the clip in the middle position, and try it...if you think it could use improvement, then you have the other two you can try as well, just be sure to put the clip in the middle position on the other two as well, so that you keep things consistent....and do some plug chops to see how it's burning.

[Andiracer]

Hi guys.

Just bought the bike, cleaned the carb and found this settings:

Needle: N82M middle position
Valve: 7
Main Jet: 190
Pilot jet: 58

Heard that the engine was in a Bike with Side-Car bevor. Could that be the reason for that big main jet? Standart is 168.

Any ideas?

Andreas

[umberto]

What altitude are you riding at?  Is it a stock bore motor?

[Andiracer]

Had Aprilia RS125, RS250, Husqvarna 125, 150 and 250, KTM 380, Cagiva Mito...Go-Ped. Never changed jetting because of the altitude to be honest. My place is @431m

Motor is stock. Has a new Piston and new crankshaft bearing.

I will do some test riding after i have changed oil. Then i will test first the 190 and then go slowly down.    I'm curious if i will recognize some difference.

[kxpegger]

190? Didn't even know they made a jet that big?

[Andiracer]

Even when i look at the altitude information...i can not go that low to have such main jet

I found 168 in the user manual July 2000 and 175 in the service manual. So it has to be more less in that range.

Now i need good wheter because at the moment we have snow and ice.

[sandblaster]

The manuals can be very conservative.
I run 168's in both my relatively stock K5's.
However, that number can go higher depending on what carburetor, pipe, port work, reed, port timing, head cut,and other mods you are running.
The best thing is to watch your plug color...

[Andiracer]

Test run today

Pilot jet should be adjusted because no idle possible.

Main jet is way to big but bike already feels great at full throttle!

YEHAAA!

[Andiracer]

Impossible to get the bike idle:

Testrun today on asphalt.
Settings:
Needle: N82M middle position
Valve: 7
Airscrew: 1.5
Main Jet: 175
Pilot jet/Slow jet: 58
Fuelmix: 32/1 (Found that in the manual...). Should i use 40/1?

Changed it to 52, 55, 62...idle not possible. Have a 60 but did not try.

Carb is clean. Engine warmed up but did not drive for some minutes.

What im doing wrong?