300ex & 11:1

[kc8pnd]

I installed an 11:1 Wiseco and a complete FMF power core 4 on my 98 300ex, after I broke it in i noticed the head pipe was glowing red, not bright but like just red enough to see it in the dark. I searched and some say its to lean, and that red pipes are normal. It has great throttle response, from idle to wide open it seems fine, no cutting, ok just a little cutting, but it was cold when it did that, but that was it. My question is is that normal for that high of compression? I know that higher compressions need race gas cause it burns cooler. I read that an 11:1 is the max compression for a 98 octane. It has loads of power now, seems like it will pull forever!
Thanks guys,
Mike

[underpowered]

on an air cooled bike a glowing pipe is normal but only if you see it in the dark. did you rejet after installing the high comp piston and exhaust? if not, you are definitally lean.

[stc416rider]

yea u sound lean try the air/fuel screw let in some more fuel

[kc8pnd]

Ah, well it was jetted before the new piston, my friend and I adjusted the screw on the bottom of the carb. He was leading the way because I know nothing about carbs, I think It has a 124 main jet? that's what he said, I bought the quad from him last year. I have a Haynes workshop manual but it don't really talk about settings. If it has a 124 main jet, is that big enough? I should have also said it only gets red at idle after 2 or 3 minutes of sitting, and you can't see it in the day.
Thanks,
Mike

Edit:
Screw on bottom, unscrew = more fuel?

[underpowered]

does it get red when riding it? the 124 is probabaly not big enough. stock is a 122, i would say about a 135 would be right, maybe a 138 main, up one size on the pilot adn mess with the air screw a little.

[kc8pnd]

When riding, I'm sure its getter hotter, but the air flow is hiding the visible effects. I will try a bigger jet now, now that I got some experienced peoples opinions :D
Thanks guys for the guidance. Hope to extinguish this light saber inches from my right leg lol.
Thanks,
Mike

[kc8pnd]

Should of asked in the last post, sorry, never really did jetting before, what stage would be recommended?

http://www.cdracingonline.com/id24.htm

[underpowered]

the stage 1 just has smaller jets than the stage 2. you dont need to go as big unless you have some major mods. stage 1 should be fine or you could just get teh individual jets instead of buying the whole kit. each jet is like $5 each vs almos $60 for a kit.

[kc8pnd]

Ok, does CD racing sell them? Or would rockymountian have them? Where would you buy them from? Local shop? I need a 135 or 138 main and what size pilot? lol question happy tonight!
Thanks again,
Mike

[underpowered]

not sure on pilot, 1 aize bigger than stock. Get a second opinion bu i think stock is a 32:confused: so you would need a 34 or 1 size bigger than stock. C&D should sell jets, or Rocky mountain.. but your local dealer or shop should have some in stock. you can buy them in a 5 pack series of 5 consecutive jets like 130, 133, 135, 138, and 140. that would be your best bet, to cover all your bases.

[kc8pnd]

I love this forum lol, hope these posts help others. Thanks underpowered, my quest has started. I will post back in a week or 2 after I install the new jets.
Mike

[2muchquad]

try a 125 keihin main,a 135 would be TOO big.

[underpowered]

Originally posted by 2muchquad
try a 125 keihin main,a 135 would be TOO big.

not really, i ran a 138 main with just a pipe on my old 300ex, jetting was spot on. he has a high comp piston adn a pipe so i figure the main should be about the same, 135 or 138 because mine was jetted for 20 degree weather.

[bwamos]

138 is way too big. I'm running a 138 on my 330ex w/ sparks exhaust, k&n, sparks cam, and oversized valves. And I'm at 13.5:1 a/f ratio all the way through the rpms. (not counting the accelerator pump spike).

Lid on I'd reccomend 128 keihin. Lid off/punched I'd reccomend a 130-132 keihin, as a starting point.

125 is probably a tad too lean.

[kc8pnd]

Showing off my ride :P But you can see the new chrome pipe has blued almost half the length of the pipe.

Image (http://www.caksquad.com/new%20300ex%20001%20(Medium).jpg)

Going to try a 128 main and see what it does, thanks guys

[Sjorge450R]

I just rejeted my 300ex after putting a .020 over bore 11:1 Wiseco and I am at a 124 Dynojet jet so i would say somewhere in the 130's is were you would have to go since the Dynojets are measured different. Oh I have supertrapp pipe and K&N.

[kc8pnd]

Does your pipe glow at night Sjorge?

[Sjorge450R]

Originally posted by kc8pnd
Does your pipe glow at night Sjorge?

my pipe is black so i couldnt tell you. Change your jetting and then see what it does.

[humblesquirel21]

i had a big gun and since i was just starting to mod my quad i belived people when they said naw u dont have ot het which i know now is bs

i was riding in the winter (really really cold like low 20s) so the bike was running exceptionaly lean and i noticed my leg was geting cold i look down and my pipe had set my thickest pair of blue jeans on fire and had burned most of the way to my nee down to my foot


moral is allways jet

ur setup is prolly alot closer than mine cause i had air filter and pipe with no jets

[Chicksdigme423]

correct me if i'm wrong but doesnt all crome discolor when it gets hot???

[kc8pnd]

yes, I think so. I think the faded blue / gold look is better then just chrome :P.

[QuadRacr57]

k i think im doing something wrong. I have a uni airfilter, no airbox lid, port and polished engine, choke removed, fmf header and Q exhaust and i am running a 150 jet. but i was running a 146 and the spark plug was black with soot all over it, and on a guide to reading spark plugs in the articles on exriders it says that that means its too rich. so i put in a 150 and it ran a lot better, and didn't hesitate as much when i hit the gas after it was warmed up. And when do you need to change the pilot jet, whats the difference between that and the main jet, and there is a air-fuel mixture screw i thought i heard? is that to fine tune it. this all seems so confusing now.

help please,
thanks -mike:confused:

[QuadRacr57]

never mind, i just read an article on jetting, and i understand it all now. i replaced my main jet to 145 and adjusted my pilot screw out about 1/2 turn maybe 3/4 and it ran the best it has since i've had it. so now i run a 145 main jet, i saw that the main jet is only for top end and the pilot screw is for idle to 1/8 throttle. so now i think i need to adjust my needle because the quad runs better just until about 1/8 maybe 1/4 throttle and it becomes lazy again. sorry about all this crap that was useless.

[elementryder]

i run a 136 with my tc shorty / k&n/no a-b lid that is what tom him self told me to run so there you go/no other engine mods