carb weirdness

[MrJslade]

So I got two blasters. One runs and is all stock except for oil injection removed. The other is siezed up in the bottom end it has a fmf pipe and removed air box lid and discontinued oil injection. So i was going to put the pipe on the one that runs. So i figured i would just put the pipe on the runing one and remove the air box lid and just use the main jet out of the blown up one(keeping an eye on the plug to make sure it wasnt lean). But when i took apart the carb from the blown up one there was a stock 230 main jet in there. The guy I bought it from said they bought the fmf and couldnt get it to run right so he had someone jet it. From just looking around on here it looks like that main jet would be to lean for no air box lid and fmf.

? # 1 Is it possible that it was jetted properly with the stock 230 or is someone just a retard. Mabey that is why it is blown up. The top end looked good though except a peice of a main bearing come up and got eaten.

So I abandoned that idea untill i get a jet kit.

So I had both carbs off and had only cleaned the one off the blown up one. I decided since the jets were the same i would just put the cleaned one on my running blaster to save some time so i could ride(i was in need of a fix). I get the carb on and it acts weird. First off it was a little harder to crank. Second it would hesitate from an idle. But then when it got to mid to high rpm it would scold the dog like it was way leaned out (like twice as fast). So i take off that carb and go back to the other with identical jets and its back to normal. WTF

? # 2 Is there any other things in the carb that could make it run lean. I dont think there was an airleak because the rpm were not hanging. Mabey float leval or something. Anyone have any ideas.

I wish it would run like that normally. It had like 2 times the power.I:I
Thanks
Slade

 

[sheeblast]

when you cleaned it, did you put it back together correctly?
you say both carbs have the same jetting? you sure?
it sounds like it is super lean with the one carb, did you put the FMF exhaust on and remove the air box lid when you but the other carb on?
also how did you clean the carb? did you let it soak in a good cleaner then blow out all the jets and seats with an air gun to get out any dirt or junk?

 

[MrJslade]

Yes I just soaked it in gas blew through the jets with air compressor and poked them with guitar strings. I looked really clean from the biggining. The only thing a took apart really was the float valve. Not much to go rong in there as far as mechanical things.

Yes both have 230 ritten on the main jet. I couldnt see a number on the pilot jet. Is there a number on the pilot.

No i didnt take off the lid or put on the fmf becouse I thought the 230 would be way lean and didnt want to hurt it.

Thanks for the fast reply
Slade

 

[sheeblast]

it sounds like the one has a clog somewhere as it is running leaner but with the same jetting.
yes the pilot should have a number on it too.
also have clip is the needle in and what needle are you running?

 

[MrJslade]

Not sure on what clip the needle is on or what needle it is. Could the blown up one have a diff jet needle and needle cage (needle cage-or whatever it is called, the piece the main jet screws into) I would imagine that the needle is stock. I didnt use the needle off the blown one, just the carb witch looks identical as far as i can see. I will have to look and see If the two needles are diff. Can you get diff needle cages.

Thanks
Slade

 

[sheeblast]

not sure what you mean by needle cage.
but there is many different needles and you can put the clip in different position. both will change fuel flow.
also take some pictures of the carbs and jets and eveything, be easier for us to help you.

 

[Awk08]

could have been any number of things with the other carb, and prolly the cause of the seizure on the blown bike, first off..230 main too small, guarenteed to blow pistons faster than wiseco can make them
most guys are runiing 270 - 290 mains with the fmf setup with no airlid
no need for complete jet kit, just get a few bigger and smaller in the 270 range, you shouldnt have to fool with the pilot jet or needle clip position (3rd slot down/middle)

********was the oil injection nozzle blocked off on the second carb, and the original one for that matter ???

a complete rebuild kit can be had from moose racing for around $20, way cheaper than pistons

 

[sicivicdude]

What is your elevation? 230 is low for no airbox lid and an aftermarket pipe at sea level but not low if you're in denver...

The jet kit usually includes a recalibrated needle to go with it which will cause a stock blaster to sputter out (rich) If you have the recalibrated needle set abnormally high on the clip position (needle farther down into the needle jet) it'll bog at low end but then run close to right (or perhaps even a little better than stock) from 1/2 to 3/4 throttle. But you are running it lean at the bottom end...

It's also possible that an experienced tuner didn't bother with the cost of a jetkit and decided to drill out the stock jet and sand down the needle profile. It's not usually a good practice because of the perdicament you're left in now with the jet labeled as stock.

There really isn't a good way to tell if that's the case expect compare the diameter of the hole inside both jets and the profile of the needles side by side. Note any differences!

The best bet is to drop a few dollars on a Vito's jet kit for stock carb without the airbox lid and start the jetting process. No guess work there, just follow the tutorial on how to adjust each aspect of the jetting to get it right.

 

[MrJslade]

Yes oil injection is blocked on both carbs.
I live in florida Elevation is about 180 Feet.
I will check to see if the main jet or needle jet have been modified.
Thanks for the replies
Slade

 

[royalt67]

Also check to make sure the pilot circuit and jet aren't plugged. I like to be able to see through the pilot jet and spray carb cleaner through the passages and see it come out in the throat. (idle and pilot passages)

Also the part the main jet screws into that you were talking about (needle jet and other names) comes out. It has several holes in it that if plugged can certainly affect things.