Gokart

[Hoffman]

Carburetor 22mm Mikuni problems

 

[ML-TOYS]

Lets just say really, wow

All mind readers step forward.

 

[firemanjim]

Carburetor 22mm Mikuni problems

I got 4l60e transmission problems.... Can you tell me what's wrong with it?

It's your first post, and you've probably never been on a forum before.....
First, when you're asking for help, advice..... We NEED to know what the problem is. Saying, "Mikuni problems " won't cut it..... Too much fuel? Not enough? Leaking? WHAT is the problem? We'd be more than happy to help.....
Second, great job on filling in the location!
3rd and last..... You even posted a pic! You redeemed yourself with the last 2 actions.... Otherwise I would have completely ignored this thread......
So fill us in, and we shall see what the correct course of action is needed.....

 

[Hoffman]

I bought a Titan tx200 and read up on upgrades and the 22mm Mikuni Carburetor had great reviews but after I put it on the engine cuts out when you give it too much gas at low rpm. Could this mean the main jet is too big?

 

[firemanjim]

See? Now we are getting somewhere.....
Go outside and pull your plug out. It can tell you if you're too rich, lean, or just right.
It could be too much, or not enough, fuel. Float could be set wrong, allowing too much fuel to seep in at idle/low rpms. Mikuni is the best..... So it's not the carb itself.....
Go check your plug first. That is gonna tell us where we need to look. If its the same plug you've had in there for a while, buy a new one tomorrow and run it for an hour or 2.... Then read it and report what you see.
There needs to be an equal balance of air, fuel, and spark. We need to see if it's the fuel, or air.....

 

[2SlickNick]

Main jet functions from 3/4 to WOT.
Here have a look at this http://www.nightrider.com/bt30/carb_jet_ranges.htm

I will try later to find the guide I tuned my carb from, but it is roughly the same.
This will give you an idea how to adjust.http://www.youtube.com/watch?v=KXxxJrA5hNY&feature=youtube_gdata_player

 

[rmm727]

I gotta ask if you done any other modifications (cam, billet rod, billet flywheel) or did you just go straight to installing that carb? Is the governor pieces completely removed for inside the engine? I can't see that carb making a difference without a better camshaft.

 

[Hoffman]

Just a fatty exhaust. 18 lb valve Springs. The carburetor alone added two hp. Basically bolt on hp. I looked at the aluminum billet flywheel as aposed to the stock steel flywheel but herd bad reviews on theaaluminum not holding up at high temp and prone to breaking. But you know how reviews go.... Some idiot that put it in wrong will complain that it was the part! Not him. It' hard to tell what upgrades are worth the time. I guess that's why I got on this forum. Oh and governor is ccompletely removed. I appreciate any advice!

 

[landuse]

Just a fatty exhaust. 18 lb valve Springs. The carburetor alone added two hp. Basically bolt on hp. I looked at the aluminum billet flywheel as aposed to the stock steel flywheel but herd bad reviews on theaaluminum not holding up at high temp and prone to breaking. But you know how reviews go.... Some idiot that put it in wrong will complain that it was the part! Not him. It' hard to tell what upgrades are worth the time. I guess that's why I got on this forum. Oh and governor is ccompletely removed. I appreciate any advice!

With the governor removed, and 18lbs springs, you NEED a billet rod. No question about it. A stock rod will not handle the RPM's. Stock springs would have caused valve float at around 5000rpm's, but now you have nothing.

 

[Hoffman]

Thanks for the tip! I looked at the arc rod. Is that a good one? It also talks about longer rod to push the piston farther up. Is that necessary or stick with stock length?

 

[firemanjim]

Just stick with stock..... You ain't racin', so save the hassle. The increase of power will not be noticeable, unless you go all out on modding the engine, in which case, yes go for the longer stroke....
BUT again, you ain't racin'.....
EDIT ARC rod..... Yes!

 

[Hoffman]

Is it really necessary tho? Don't get me wrong I want the motor thinking right but I'm on a budget so my upgrades have to be worth the cost and labor. Taking the governor out really didn't add much on the top end. So is it still overworking the stock rod?

 

[Hoffman]

I checked the spark plug when I got hom. It's got a tan color and unless I'm wrong that mean a good air gas mix right? I aadjusted the needle in the carburetor and set the cotter pin to its lowest setting. It helps from bogging down. But still has that hesitation when you mash on the pedal. Could it be my throttle linkage?

 

[firemanjim]

Tan is good.....
You adjusted the air mix? Try this.... Screw it in all the way, gently.... Now look at the slot in the screw. Using the slots current position, turn it out, 1 and 1/4 turns. See if that is better. If not, try 1 and 1/2 turns.... Somewhere in that area, is your sweet spot, for general setting.
You might also index the plug....
Removing the governor should have made a huge difference in performance. Something must not be right. The last time I did it at a customers request, he called back wanting to know what the heck I did to his kart. It was WAY faster /powerful than before.
With stock springs and no governor, you should be hitting at least 5000 rpm. You put 18# springs too, IIRC.... So you are probably able to go higher. My stock spring gx160 hits over 6400, with no governor. I still have stock rod, but I use a data logger/computer. I have warning lights set for 4800, 5200, 5800, & 6200 rpms..... The latter being the max rev lights...... I tend to stay in the first 2 light sets.... BUT will run through the others at short bursts, to keep from blowing a hole in the case.....

List everything you have done to the engine. Post some more pics, detail pics.... The linkages, ect...... Maybe something is just set up wrong.... You should have felt a huge difference with the governor removed.......

 

[rmm727]

The carburetor alone added two hp. Basically bolt on hp.

You got a dyno?

 

[firemanjim]

That's what the guy selling it to him told him..... I would have sold him one that was a bolt on 6hp........
And cheaper....

 

[rmm727]

Butt Dyno

 

[Hoffman]

I just ordered arc flywheel and arc rod and a dyno cam. I'm leaving town tell Friday and the parts should be here by then. As Ibreak it down I will post pictures! The cam drops in and the flywheel bolts on. The only thing that intimidates me is the piston rod. Just because I've neveriinstalled one before

 

[firemanjim]

Don't be intimidated...... It's not hard, difficult, or super technical...... You CAN do it, when you TELL yourself "I CAN do this......!"
Never think " i can't...." or " i don't know how.... "....
All the things I've accomplished in life, is because I said "I CAN!" the times that I second guessed myself, I lost out.. So always be positive. If you couldn't do it, you wouldn't even be here trying to learn.....

 

[Hoffman]

Thanks firemanjim! You have been most helpful. I'm trying to have the gokart race ready for a desert race. The tarantula in Alamogordo new Mexico is February 3rd. I think it's race 5 or 6 of the new Mexico circuit! Any endurance race tips on prepping the motor? I can't afford anymore upgrades before the race because I'm going to need new rear tires. But as far as tuning what I have...?