Reving at idle questions...

[chris200x]

I just finished up with the swingarm and axle bearings. I added the supertrapp, K&N (already there actually) and rejetted the carb from a 130 to a 132.5. Now it doesn't start as easily as it used to but that's not really the problem. It's revving up and down when it sits at idle??? It also backfires a bit after hitting the gas hard and letting off. But other than that it runs really strong. Alot better than before. Any ideas what I need to do. Here's a couple vids of my son riding it...

http://s38.photobucket.com/albums/e137/chrisr200x/?action=view&current=swingarmpics192.flv

http://s38.photobucket.com/albums/e137/chrisr200x/?action=view&current=swingarmpics197.flv

[Dammit!]

It's revving by itself? Check for an air leak.

[chris200x]

Yes, all by itself... up and down... I will check for that leak.

[chris200x]

OK no airleak around the intake or carb. But I do not remember seeing a header gasket when I took the old pipe off and put the new one on. Can this be the problem?

#1 on the schematic.

http://www.bikebandit.com/partsbandit/showschematic~dept_id~175686.asp

[traxxasx]

OK no airleak around the intake or carb. But I do not remember seeing a header gasket when I took the old pipe off and put the new one on. Can this be the problem?

#1 on the schematic.

http://www.bikebandit.com/partsbandit/showschematic~dept_id~175686.asp


naw dont think so. maybe lower you clip or higher it , worth a try.since you said no air leak.

[chris200x]

Well instead of moving the clip I put a bigger jet in to compensate for the pipe and filter..... Anyone else have an idea? I'm guessing if they show it IT should be there?

[Dammit!]

An exhaust leak right at the head can cause some weirdness. Get a new one of those rings. If it's anything like a 200x, it's a soft metal that crushes to make a good seal when you tighten up the header.

[cragster]

All of my trikes idle like hell when im low/out of gas. Make sure you have plenty of gas.

[mark38090]

interesting thread since I am having the same type problem with my 250sx that I just got running...

[sblt500r]

did you change the pilot jet? sounds like you need a bigger pilot jet. that will help in starting, and should cure the erattic idling.

[chris200x]

Pilot jet? what's that? LOL.. I'm not to up to date on my carb terminology... But I just changed the big jet in the carb. (the one right smack dab in the middle of the carb.) :wondering
In the manual it says there is a main jet and a slow jet.. I increased the main jet. (looks like the top of a flathead screw with a hole in the center)

Will I hurt anything without that copper gasket in there? I torqued the nuts down so the header is snug against the cylinder...

OH I should add I have to keep adjusting the idle everytime I stop. It fluxuates (sp?) up and down while in neutral.

[Tri-ZNate]

slow and pilot are the same thing. Also known as the "tiny one" ;). Yeah copper will work Chris, we used aluminum foil wraped into a cigarette lookin dealy and put that on as our gasket on the quadsport

[chris200x]

I cannot really get this POS camera to focus in on the tip of the plug. This is a brand new plug but I'm not sure if I got the "tecnique" down right. I got it up to 3rd gear as quick as possible (not enough room) and WOT then turned the key.

I'm not sure which part of the tip I'm supposed to be looking at though. Half the little arm is black and white. Half the ceremic around the electrode is black and white.

So my question is is it running lean OR is it this way because it was a brand new plug and I did not do the plug chop correctly? :wondering


sorry for the quality of the pics but I cannot get the camera to focus properly. Oh, btw this is with the next bigger size main jet still in there...

[chris200x]

this may help a bit?

I also noticed it revs if I turn the handlebars? wtf?

[Dammit!]

I also noticed it revs if I turn the handlebars? wtf?

Check your throttle cable. It may be binding up somewhere. Lube it up while you're at it.

Get the exhaust gasket. It should be easily available and only a few bucks.

The plug looks a little lean but it's very hard to tell on a computer screen. My colors might be off a little bit here at work.


Pilot jet? what's that? LOL.. I'm not to up to date on my carb terminology...

I am very disappointed... (http://www.3wheelerworldforums.com/showthread.php?t=55086)

[chris200x]

http://smilies.storagebin.us/smilies/damnit.gif Sorry to dissapoint. :lol: I was just wondering if I got an accurate enough reading on the plug. I did go WOT but only for a few seconds as I was running out of room quickly. And I'm not sure if you have to be going in the highest gear and whatnot...

I have a copper gasket and some slow jets on order (will be in tomorrow) I hafta get this up and running for this coming weekends trike ride. :w00t:

Maybe I'll try to put the stock jet back in and just mess with the clip. OR worse case senerio is put the stock pipe back on. :(

[Tri-ZNate]

chris put a milk crate under the rear end of the trike and just run it in the garage.

Make sure there is play in your thumb throttle, what your describing is a too tight throttle

[traxxasx]

Hope i dont have to go threw this, i want to get it right first time or close. Keep it up you should have it running well soon.

[traxxasx]

Well It's not really hard just frustrating to keep pullin the carb off. I actually have it now. I took the bigger jet out and just dropped the clip one notch. Seems to be ok for now. :w00t:

I pulled the header off just to double check to see if there was a gasket in there or not. NOPE! :( I discovered a nice amount of black soot in one spot on the outside of the header. I'm guessing this means there is indeed a leak there...


Like stated before take some tin foil roll it up with like a pencile get it thick. Then turn it into a circle so its like a gasket cut it and fit it tto right size put it in there tight it down your done. You cant just drop a notch to comply with the exhaust to get all out of it. You have to rejet and you will see a difference. I guess ima ganna get mine tommrow its kinda late now,.

[chris200x]

Like stated before take some tin foil roll it up with like a pencile get it thick. Then turn it into a circle so its like a gasket cut it and fit it tto right size put it in there tight it down your done. You cant just drop a notch to comply with the exhaust to get all out of it. You have to rejet and you will see a difference. I guess ima ganna get mine tommrow its kinda late now,.

Homie don't play that redneck riggin game.. :lol: OEM copper gasket for me thanks. :)

Actually Huffa heare on the boards has an SX with a supertrapp and uni filter and this is the same thing he did. (dropped the clip a notch) His trike runs great!

The parts place said maybe tomorrow now for the gasket. :twisted: After telling me today it will be in. :rolleyes: But I planned on pickin up some jets while i was there.

Once I get that in and the airbox and everything back on I will know for sure... I'll probably have this thing apart 5 more times before Sunday's ride. :lol:

[traxxasx]

Homie don't play that redneck riggin game.. :lol: OEM copper gasket for me thanks. :)

Actually Huffa heare on the boards has an SX with a supertrapp and uni filter and this is the same thing he did. (dropped the clip a notch) His trike runs great!

The parts place said maybe tomorrow now for the gasket. :twisted: After telling me today it will be in. :rolleyes: But I planned on pickin up some jets while i was there.

Once I get that in and the airbox and everything back on I will know for sure... I'll probably have this thing apart 5 more times before Sunday's ride. :lol:


Ok ofcourse it will run fine with just droppin the neddle. Mine does right now. But the whole point of putting an aftermarket exhaust it for performance and sound. Now when i had my stock exhaust i used to take my freind off the launch thru 4 gears then he pass me. Then when i put the cobra slip on , he just took me at launch and left me seriously by a mile. When before i was right bhind him. So people tell me it cause you have to rejet to bigger sizes and you will feel a big gain. So im going to soon and what im saying to you is your not getting full performance out of your pipe by just droppin the clip.

[Tri-ZNate]

I'll probably have this thing apart 5 more times before Sunday's ride. :lol:


Well if thats the case if we come down saturday night then maybe we can throw a 350x carb on that so you can have some real fun for a few minutes :lol:

[chris200x]

Sorry nate... But saturday night is reserved for some hardcore power drinkin! :beer

I'm starting to get very very frustrated with this thing... I put the next bigger slow jet in along with the bigger main jet. It stopped reving but now it boggs when I hit the throttle... :eek: :wondering

Anyone got any more ideas? :(

[chris200x]

Sorry nate... But saturday night is reserved for some hardcore power drinkin! :beer

I'm starting to get very very frustrated with this thing... I put the next bigger slow jet in along with the bigger main jet. It stopped reving but now it boggs when I hit the throttle... :eek: :wondering

Anyone got any more ideas? :(

OK then.. I am stumped. :confused: Which one of these explananations (dammits jetting thread) does this situation fall under? :wondering And what would be the best posible solution? :confused:

Sputtering: This isn't exactly a technical term but is commonly used to describe how an engine runs when jetted too rich. For example, using too large of a main jet will cause more fuel to enter the combustion chamber than it can efficiently burn. This will result in a "sputter" at full throttle. It could best be described as a rapid misfire. Note: a rich condition is not the only possible source of this type of problem.

Bogging: Again, not a technical term but commonly used. Bogging can be a result of a lean setting where not enough fuel is entering the combustion chamber for the motor to run properly. In some instances this can cause the machine to "bog" as if it were actually running out of gas. Note: a lean condition is not the only possible source of this type of problem.

Before I go tearing this thing all aprt again I would like to get some opinions on what to try so I dont have to rip into it again. :twisted:

[Tri-ZNate]

take the airbox lid off and see if its just too rich

and adjust your clip to where it was before

[chris200x]

Well I don't even have the box on there yet. ;) what a PITA!!! Oh and I put the clip back into the second position.... :cry:

[Tri-ZNate]

ok so you put the bigger slow jet in and now it idles, however it boggs when you hit the throttle?

I really dont think your main jet is too big since guys have run the 138main on the 350x carbs.

If you ease into the throttle does it break up or just die?

Ha know what? I'll bt your running too lean with no air box. does it even have the filter on? Throw the box back on and see if it gets better or easier is to put your hand over the intake to the carb to cut off air and richen it up first. I would try this Idea first

[chris200x]

will do. It such a PITA to get these rubber boots back on the carb and airbox. I'm gonna go try this again...

Hey! It's only when I nail the throttle.. if I ease into it it's fine. wtf?!?!

[chris200x]

Ya know I'm starting to think that maybe not having thatcopper gasket in the header was causing the revving. It's in there now and no revving... IDK.....

[Tri-ZNate]

Hey! It's only when I nail the throttle.. if I ease into it it's fine. wtf?!?!


its not cold is it? lol

[chris200x]

Sheesh... Bonehead that I am accidently put the old main jet in instead of the bigger one. I got the boots all hooked up to and the airbox back together and it seems to be running good. (again lol) \
Boy this got some gitty up and go now! :eek: :w00t:

[Dammit!]

You like doing things the hard way don't you. :lol:

For future reference, never, EVER adjust your carb without everything being exactly as it will be when you ride it. Meaning, the airbox/filter/lid/exhaust yadda yadda all have to be mounted up the way they will be when you're done. Otherwise you'll go through all that trouble for nothing because putting all that stuff back on seriously alters your airflow. Exhaust leaks on 4-strokes can do really funky stuff too (as you obviously now realize). Glad it seems you got it running right. Do some plug chops just to double check.

The good news is, the more you do this stuff the easier it gets and the more sense it will make. :beer

[chris200x]

Ha ha.. I wouldn't have it any other way...

Hmm, I don't know. I just pulled the plug. this is after just riding it around pretty hard the last couple minutes.

[Dammit!]

Like I said before, it's hard to tell in pictures (especially here on my work computer) but it looks like you could richen it up a bit more. Another main jet size and drop the clip one more notch.

All you can do is try it and see how it runs. I personally like to jet rich to the point that it starts sputtering a little bit, then lean it back out just enough to get rid of the sputter. Then I check the plug to see if it's excessively rich or not.

[Mr. Sandman]

Plug chops on a 4 stroke? I don't think you'll ever get the results you're looking for.

[Dammit!]

I used to do it on my 200x and never had a problem. I don't use plug chops as religiously as a lot of people do though. I like the jet rich then lean down method personally. Then I check the plug just to make sure everything is as it should be.

[chris200x]

OK, I just went out and dropped the clip one more notch and flew down the road... No more sputtering or bogging. (although I don't think my neighbors are to happy! :) ) I pulled the plug and I think this will safice. :naughty: This is the carboard color I was looking for....

This has definatly been a learning experience. :D

This thread is officially closed! :lock: :lol: :w00t: