Stock 86 250R flat out flies with this jet setup

[whyzee]

bone stock,original piston Temp today 58 .
main jet 140
pilot jet stock
needle clip positon : all the way to the top
air screw 3/4 turn out from full in
32 to 1 mix.
I know you guys will say this is way too lean but the bike is flat out arm ripping
10 degree change in temp is noticeable. I can usually get that in the air screw
bike is crazy fast,no death rattle, no lean bog just sick bottom end alll the way to the rev limiter

Best setup I have found for woods and tight tracks where you are only wide open for 2-4 seconds up to 4th gear.

[jeffatc250r]

ok...

[oldsking86]

We'll be here when you have an issues later on down the road....

Have you checked the plug after riding?

[whyzee]

point is The honda stock jetting is wayyyy to rich for almost every application and this setup could not be any better at all for these conditions. Remember there are alot of newbies here.Guys buy bikes in Az and ride em in the east and say its fast but it falls off. Well they probably have a 155 main jet in there.

This setup is the ticket for those of you on the east coast for a BONE STOCK 86 250R. that means stock air filter also!!!

[whyzee]

Insulator looks great, light brown... I know I am waiting for the hole in the top of my piston. I don't get to do any 5th or 6th gear wide open, but 1 to 4th wide open...holysmokes it is sick!
Basically is is a great woods, tight track, setup if you can hang on.
I am sure sand or alot of wide open long throttle runs I would instantly see that I am to lean, but alas, no Glamis in CT.
I will certainly richen it up for the cold and our sand (snow)

[edog]

Well I got mine properly jetted.It will take you breath away!
It isn't stock thow.

I run the main a little lower 150.I have my needle all the way up.

[edog]

Insulator looks great, light brown... I know I am waiting for the hole in the top of my piston. I don't get to do any 5th or 6th gear wide open, but 1 to 4th wide open...holysmokes it is sick!

No 5th and 6 th...Where are you riding?

[Rustytinhorn]

I dont think you are lean. I also notice a big difference in performance as soon as it turns into jacket weather. Then again, I dont have a lot of air up here at 5280 feet. The manual recommends a 140 main for certain conditions anyway, so if it checks out o.k., then I see no reason to worry. But be careful, if one is running lean it will make it rev up quicker.
I have spent since Feb. 2007 dialing my jetting to were I want it. Its just about perfect, and I tell you what, I have some great bottom end-top end power.
I'm not stock, but FYI I run a 130 or 132 main jet.

[Liquid-Darkness]

I ran a 140 before. My old R had power reeds and a DG exhaust+unifilter. I also repacked the silencer and threw on fresh topend. It does rip, but I recomend 110 with these bikes. They run so smooth and fast with high octaine. 200psi max compression. With a few main jets richer and a whole lot of small aftermarket mods, the bike will scream with even more power.

[1DEADPRESIDENT]

Hey Zee!

32.1 isn't really that lean. I use the MOTUL in my 88 R & @ 40.1 it rips all the way through and I too have messed with the mixture in the stock ATC's and the factory recomendation is rediculous.

[ceaserthethird]

Moved from thee 160 main jet -

Man this is so true i just drop my main Jet to 145 , Stock Pilot , Need Clip second from the TOP .... Still Running Rich But Made a huge difference !

[whyzee]

Moved from thee 160 main jet -

Man this is so true i just drop my main Jet to 145 , Stock Pilot , Need Clip second from the TOP .... Still Running Rich But Made a huge difference !

Go to the 140 main, needle clip all the way to the top. even more wow!!!!
I had a 145 main and I didn't think it would make that much of a difference... wow!! Do the needle clip also!

[dwolf8u]

im at 7200 ft 50-80 degrees normally 140 main,stock pilot,clip on top groove,and run 32:1 honda syn. .htfo.. and let the fun begin.

[NINJA]

Hey Zee!

32.1 isn't really that lean. I use the MOTUL in my 88 R & @ 40.1 it rips all the way through and I too have messed with the mixture in the stock ATC's and the factory recomendation is rediculous.

Yeah, you're right, it's not lean, in fact it is rich. The stock 20:1 is lean, more oil and less gas=lean mixture.

[1upfront]

I ran my 84 250r motor with a 108 jet for a full season at the drag's using 110 octane mixed at 20:1 with amsoil dominator and with an open uni filter, that thing flat out screamed it ran a fastest time of 5.611 in the 300ft never had any problems, that's the way these thing's are made to run stock jetting is just mainly for break in purposes and also to tune the bike down. Also 110 octane is a richer fuel than pump gas and requires less fuel per air to do the trick so it usually requires dropping a couple jet sizes.