Jetting Question

[$K2]

Hey fellas..

 

Engine is ported with 34mm PJ's. I can get it to idle just fine and rev throughout the powerband while in neutral no problem. Slight hesitation while tring to rev from idle but then really revs..

 

Problem is trying to get going in first gear.. She really 'bogs' down and I have to really get her revvin before she will start haulin ass...

 

I just pulled both carbs out, cleaned them etc etc..

 

I have 158 mains, pilots I have no idea... These are brand new carbs, pre-jetted..

 

Another question is where is the Pilot Jet located??? I easily found the Main when I took the float bowl off but didnt see a Pilot.. Didnt really look either..

 

I would like to get rid of the hesitation when I try to get out of first gear..

 

I pulled the plugs after I let her cool down and they are tannish/brown.. not oily at all... That has me a little concerned about it being lean but then why the bog down?? That is where I am confused...

 

Thanks fellas for the replies!

 

Ken

Edited November 16, 2004 by $K2

[Wallynut]

When you take the bowl back off, the pilot should be right next to the main, down a tube that is part of the carb. It will require a small flat blade screwdriver to remove it. I can't help with jetting on 34 PJ's, but others will pipe in soon, they will need to know where your clip is on the needle, besides what pilot you have.

You might try moving the needle one notch one way and then the other. Give it a try while you have it apart.

[locogato11283]

id say pull your pilots and see what you have in there. just because it was pre jetted doesnt mean it was jetted right. sounds to me like your problem is in the pilot jet. once you get that dialed in then you can tend to the needle.

[Schizo]

Depending on the porting and the air filter setup 158's sounds kinda small. I have 178 mains and 48 pilots. Get the bike warmed up to good operating temp. then let it idle, adjust the air screws in or out untill you have reached the highest idle setting (waiting about 10-15 sec. after each adjustment) if you are within a 1/2 turn from seated then you need a bigger pilot, if you are more then 2 1/2 turns out then go smaller....

[$K2]

just because it was pre jetted doesnt mean it was jetted right

 

Yea it was pre-jetted for Sea Level... I am about 2,584 ft. above Sea Level.. Tucson Az..

 

Depending on the porting and the air filter setup 158's sounds kinda small. I have 178 mains and 48 pilots

 

What do you think is a good starting point for my current elevation???

 

Also, as I said in my first post, it sounded like it was Rich, but then I pulled the new plugs I put in and they were really close to a light tan.. Not even brown at all.. that is what is so confusing to me..

Edited November 15, 2004 by $K2

[FIRST BANSHEE]

just because it was pre jetted doesnt mean it was jetted right

 

Yea it was pre-jetted for Sea Level... I am about 2,584 ft. above Sea Level.. Tucson Az..

 

Depending on the porting and the air filter setup 158's sounds kinda small. I have 178 mains and 48 pilots

 

What do you think is a good starting point for my current elevation???

 

Also, as I said in my first post, it sounded like it was Rich, but then I pulled the new plugs I put in and they were really close to a light tan.. Not even brown at all.. that is what is so confusing to me..

280960[/snapback]

go up a size on your pilots and try again. give us the results.

[$K2]

Think I should meess with the mains at all too???

Edited November 15, 2004 by $K2

[FIRST BANSHEE]

Think I should meess with the mains at all too???

281235[/snapback]

if they are pre jetted for sea level and your at 2500 ft you should be a little rich. but they sound a little small to me.

[$K2]

Yea I agree.. Since I am taken them apart anyways I think I will goi ahead and change them. Go up a few sizes and see what happens..

 

Thanks fellas for the input..

 

K

[SICK BOY]

Only do one change at a time.If you do pilots and mains and it's worse,then you won't be 100% sure what made it worse.

[$K2]

DUH... Good idea.. didnt think about that one..

[Banchetta]

Hesitations are often caused by a lean condition,not a rich condition. A rich condition will make it spit and sputter like the choke is on. How does it start when hot and when its cold? Do you have to use the choke cold? HOt? This will help determine how close your pilots are. Also, check to see what kind of needle you have and what clip position your at. You'll have to remove the needle from the slide to determine this....

[$K2]

Hesitations are often caused by a lean condition,not a rich condition. A rich condition will make it spit and sputter like the choke is on. How does it start when hot and when its cold? Do you have to use the choke cold? HOt? This will help determine how close your pilots are. Also, check to see what kind of needle you have and what clip position your at. You'll have to remove the needle from the slide to determine this....

281324[/snapback]

 

Starts fine when shes hot.. Cold is a different story. When I turn the petcock to "ON", one carb starts overflowing from the float bowl... its takes about 4-5 kicks to get her started.. i never have to choke it.. When I ge the carbs apart, I will have to check the needle.. Looked like a bitch to get off and I was runnin out of daylight to go through that..

[Banchetta]

Hesitations are often caused by a lean condition,not a rich condition. A rich condition will make it spit and sputter like the choke is on. How does it start when hot and when its cold? Do you have to use the choke cold? HOt? This will help determine how close your pilots are. Also, check to see what kind of needle you have and what clip position your at. You'll have to remove the needle from the slide to determine this....

281324[/snapback]

 

Starts fine when shes hot.. Cold is a different story. When I turn the petcock to "ON", one carb starts overflowing from the float bowl... its takes about 4-5 kicks to get her started.. i never have to choke it.. When I ge the carbs apart, I will have to check the needle.. Looked like a bitch to get off and I was runnin out of daylight to go through that..

281449[/snapback]

sounds like your pilots are within 1 size of being spot on. You should have to use the choke to start it and should be able to start it easily when warm, so your very close. I'm thinking that your needles are way too lean and possibly the mains. I'd start w/ raising the needles one clip. If the shee responds well, then I'd raise them again. Find the optimum setting. This will make great changes in performance and low end response. Once you find the sweet spot, then run the shee wide open for 5-10 seconds in 6th gear, coast to a stop, pull the plugs, thats how you can adjust the mains and ONLY the mains. You want a dark brown color. Tan is too lean, black is too rich. Before you do your first wot run, I'd bump your mains to a 165 main, better to start rich and work down...I'd think you should be perfect around 162. Good luck and let us know what you come up w/.

[$K2]

Thanks bro I really appreciate the info! One quick question for ya that I was wondering about.. I am reading through that other thread with the poll about what you have for your jets, filters etc etc and I see others that have their mains at like 230, 280, 320.. Why are mine so damn small?? Is it cause I have the 34mm carbs???

 

Thanks