Poor running Talon 260 By arckitel (Read 1,688 times)

[arckitel]

I have the 07 Talon 260 with the Linhai engine. It just suddenly started acting like it is getting overloaded with fuel and doesn't run at anything over idle while under a load. When sitting in neutral, it screams like a banshee.

What Ive done:
Cleaned the Carb twice (except for the diaphragm on top, don't know if there is anything in there I could screw up by taking the top off).

Removed the air cleaner (intending to replace)

Checked the plug (needs replaced, but still has good spark)

Adjusted the lean/rich screw.

Cleaned the pump.

Checked fuel filter.

Sprayed Carb Cleaner on the vacuum lines, No change in idle.

Cleaned the Auto Choke.

I still have not found the problem. I am not ruling out anything yet though so if you have an idea, throw it at me.

The thing acts like it is overloaded on fuel or maybe like the choke is sticking causing it to not get enough fuel. Its hard to tell. After each time I clean the carb, the thing runs great for the first 5 minutes (just enough time for the choke to shut off, which leads me to believe it isn't sticking at all). Then it goes right back to not wanting to run at anything over idle. It spits and sputters and dies if I don't keep pumping the hell out of the throttle. I'm at a loss. I need some experts! ;D

[arckitel]

Nobody has any ideas at all? I though for sure someone here would have a clue. Ive done some more cleaning/adjusting/inspecting and Ive got it to where it will idle but loads up on fuel when I crack the throttle. I checked the float and it appears to be in good working order. Does not appear that there is any fuel in the float itself. Im wondering if maybe the float needle needs adjusted because it doesnt close all the way?

[richardthescooter2]

When cleaning carb, the diaphragm area is important too. If the diaphragm isn't sealed right or if the rubber has pin holes it would effect performance. When was the last valve adjustment? And what did you adjust a/f at (how many turns out)

[kz1000st]

Guess what's the number two problem with Linhai 260 engines? The first is valve adjustments. The second is decaying diaphragms in the carburetor. If you pull the diaphragm I'd almost guarantee the diaphragm is cracked or torn. It's why the new generation of Linhai motors is moving towards fuel injection.

[richardthescooter2]

Hi kz100st, is it hot up there?

[Alleyoop]

Well you told what the problem is. When starting it cold it idles up and as soon as the ENRICHER shuts off the extra fuel it sputters and dies.

That says the PILOT JET is CLOGGED and OR THE passage and or the TINEY HOLES BY the BUTTERFLY that the FUEL OUTLETS are for the PILOT JET.
So take the carb off.
1. take out the pilot jet and make sure you can see DAYLIGHT THROUGH it.
2. Then with a SPRAY CAN OF CARB CLEANER (they come with a long thin straw) stick it into the hole where the PILOT JET SCREWS INTO and SPRAY holding the BUTTERFLY OPEN with your hand.
3. Spray should come out of the TINEY HOLES right by the BUTTERFLY.
4. Then Turn the FUEL RATIO SCREW clockwise until it stops(Count the Number of turns it took to stop).
5. Then turn the SCREW COUNTER CLOCKWISE that same number of turns OR 2 1/2 turns.
Put the carb back on and give that a shot.
Alleyoop






WHEN YOU SPRAY INTO THE PILOT JET HOLE MAKE SURE SPRAY COMES OUT HERE:



Alleyoop

[kz1000st]

Jul 18, 2013 11:26:47 GMT -6 richardthescooter2 said:

Hi kz100st, is it hot up there?

Scorching. I know there are places where 91* isn't hot, but for here it's outrageous.

[Alleyoop]

If you guys want to CHATTER about the HEAT pm each other has nothing to do with helping this guy out, Or start a thread about the heat.
Alleyoop

[arckitel]

Thanks for the input gentlemen (ladies?). I didnt know that about the diaphram and I was wondering what the hell those little holes by the butterfly were. LOL I learned two important things today. Im off to check both of those and see what's what. Question though. If the diaphragm is bad, can it be replaced or do I have to get a new carb?

[Alleyoop]

Right now do not worry about the DIAPHGRAM that only comes into play when your throttleing up to speed. Right now you have an IDLE problem after the ENRICHER cuts off the extra fuel HAS NOTHING TO DO WITH THE DIAPGHRAM.
Alleyoop

[richardthescooter2]

Alleyoop, (sorry about that) I agree.

[arckitel]

Ok, Ive cleaned the diaphragm and the Pilot out real good and gave the carb a good cleaning again. Ive got it idling fairly well, and it will run with a full open throttle. Its the mid range that it spits and sputters in now. Im going to get some feeler guages tomorrow and adjust the vavles to see if that helps. I did notice that I can hear a little bit of a backfire when running full open throttle so thats why Im adjusting the valves. I do have another question though. My fuel filter isnt filling up with fuel for some reason now that its been emptied when I cleaned the carb. Do I need to fill it manually?

Thanks again guys.

[Alleyoop]

GREAT!! Good work, Backfiring means it is running LEAN and can be caused by AIR LEAKS as well as not enough fuel. If adjusting the valves does not get rid of it RIchen up the FUEL RATIO MIXTURE try 1/4 turns COUNTER CLOCKWISE at a time.
Alleyoop

[arckitel]

Ok guys. We're getting closer. Ive adjusted the valves and put in a new plug. Ive got it idling great. Ive got it to where it will run full throttle on the stand. But if I try to run 1/4 throttle it starts chugging. When I try to ride it in low gear, it does ok. But in high gear it doesnt want to go at all when I try to give it throttle. Obviously High gear means more load on the engine. Timing came to mind but Im going to ask you, the experts on these, your opinions. Oh, I adjusted the valves to .02 intake and .03 exhaust. I think thats a bit loose still as I am now hearing the rocker arms chattering. We're getting closer! Thanks for all the help!

[Alleyoop]

NO .02 and .03 are TIGHT not loose.

The valves should be set to .003 INCHS and .004 inchs.

Alleyoop