Question about 1987 Honda NSR 250 MC 16

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J.D snowmobile 340 73 carb wont idle appears internally clean.

I have no knowledge on there carb adjustment After cleaning carb and fuel system it runs good but no idle. cold start good. Choke becoms to much as it warms. Off the choke, all good ,
20 sec lator it starves of fuel. Choke and start great again. Off choke 5 sec starve of fuel.throw choke on as needed to keep running. Sled drives fine.Seems to be lean on the bottom end.And throttle is slow to come back down to idle

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My guess is that its not the carb at all but it might be the gas line in side the tank is cloged to the point whare you need to have it on choke in order to pull enough gas to the carb which would be the reason for it not wanting to come back down to idle quickly or it could be the fuel pump is cloged and if you tried that already than the fuel adjustment is way off and will need to be adjusted while a friend or family is keepin it running






and if that is not the problem than email me.
good luck:)

Posted on Jun 02, 2009

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I would have your compression tested, if its a two stroke, and you can use tools with out breaking things or yourself, pour a cup of fuel down the left hand side of the carb and take the right hand side of the carb off and crank it like mad, if fuel leaks from there you better get to a repairer.

other wise the idle adjuster is usually on the left hand side where the accelerator linkages are, it will be a screw where the linkage touches when the throttle is closed. not too hard to find if you have a light source.



Hope this helps.


If you want any more help just ask :)

Posted on Feb 08, 2009

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1 Answer

The throttle needs to be held in order to get it running, seems to be flooded when choke is used on a cold start. Once it is running it runs fine for the day. Just the morning start up is the problem....


SOUNDS LIKE TUNNING PROBLEM..TRY RUNNING IT ON A LONG TRIP WITH THE HIGHEST OCTAIN YOU CAN FIND PREMUM FOR SURE AND SEE IF THAT CLEANS IT OUT IF NOT YOUR GOING TO HAVE THEN CLEANED BY SOMEONE WHO KNOWS WHAT THEY ARE DOING..YOU ONLY NEED TO CHOKE IN COLD CLIMATES..TRY ONLY HALF A CHOKE INSTEAD OF FULL CHOKE..THE CHOKE DUMPS RAW FUEL INTO THE ENGINE FOR COLD START UP ONLY..MAYBE CHOKE NEEDS ADJUSTMENT..

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I have a 1986 GMC 1500 with a 5.0 and stock rochester carb. The truck will start but you must keep gassing it as it won't idle. It kicks off every time. Any suggestions on how to fix this cold natured


fast idle speed screw, works off the fast idle cam which the choke adjustment sets, it works together by linkages. This is the raised idle speed setting you need to keep a cold engine running. First you set the idle speed by the idle speed screw with engine at normal operating temperature. Then you set the linkage up so the cam is on a raised step, throttle will be held on that raised step. then you can turn the idle speed screw to get idle at about 1500-1800 rpm. Now when you start engine cold, choke will set the fast idle cam on that raised step- when engine starts and runs it should be running at your fast idle setting. That's how it supposed to work, you just have to get everything adjusted right. I hate carburetors, they never stay adjusted right. Considering their complexity and small mechanical parts, no wonder.

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You've got an air leak somewhere. Running better with the choke closed is the clue. Air is entering somewhere else and by closing the choke you are basically adjusting the air/fuel ratio to be more correct.
With a combustible carb spray and red nozzle pipe, you can lightly spray around the carb as the engine runs and see where the running changes and that's your leak point. Keep the spray away from the carb inlet so you don't get misled.
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For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Xr hard start solved Heres the fix
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http://www.partsfish.com/page/oem-parts-for-honda
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Our HMSK 80-110 electric start snowblower starts up right away, but the idling is very rough. It runs very smoothly when it is engaged in snow throwing.


The Tecumseh snow motors are notorious for idling rough. Especially the last few years of production. Most service techs just say "live with it" But there are a couple of things you can do to help.
It is not a carb adjustment issue. It's usually a fuel, clean carb issue.
First, use a premium grade fuel without ethanol and a fuel stabilizer. This will give you the best fuel mix.
Second, Remove the carburetor shield and clean the inside and outside of the carb with carb cleaner. Even though you can't see the carb usually, they do get varnish build up and cleaning it will help some.
Third, Put the recommended amount of fuel system cleaner in the gas. I use Sea Foam brand. Over a tank full or two you will notice a difference in how the engine idles.
Fourth, Use a high quality spark plug and use a new one every year. Make sure the gap is correct.
Good Luck! Feel free to as any other questions you may have. Don't forget to rate this answer!

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The problems with a plunger style choke happen when the rubber on the bottom becomes deformed and does not seal or the spring does not push the plunger down hard enough, or the cap breaks so the plunger is not pushed down hard enough. If you put your finger over the hole and the bike runs properly your bike is running on choke. You have to block the hole deep inside the carb to shut off the choke. I assume the original problem was that the bike would not idle .If this is the case, take the carb apart remove the slow jet and clean the jet and the carb body out so fuel will flow at idle. This should fix your no idle problem.

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Starts and idles will not run above idle unless choked. Have cleaned carb multiple times new fuel filter new air cleaner and cleaned exhaust screen new plug. Maybe a collapsing fuel line?


Hi,
Have you tried adjusting the carb? There should be two screws on the carb (hi & Low) turn the hi screw completely until it stops and then start the unit. Let it warm up and then begin to back the screw out until it starts to run smoothly but strong. Once you have it running then put it in full run position (choke) and you should be good.
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It said free tech support for a 2006 vento vthunder. That's what I have. I'm havine difficulty getting it started. It has good spark, it is getting gas through the carb. I believe the idle adjustment screw...


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1 Answer

Craftsman lawn mower 17.5hp won/t start


That's a good indication the air/fuel mixture is off. Before you try to adjust the carb, make sure the air filter and prefilter are clean. If they are filthy, replace them. Make sure the carb looks clean when you take the air filter off.

Adjustments to the carb are not easy and if you don't have a service manual or operators manual it's probably something you don't want to tackle, unless you have a good working knowledge of small engine carbs.

I would probably have that serviced. But first, I couldn't resist taking the air cleaner off, turning the throttle up about half way, and squirting a small amount of starter fluid into the carb, then crank it to see if it starts.

Do not choke it. If it starts, run it a while, but put a clean air filter and prefilter on it while it is running. Then see how it runs, and if it seems okay, try cutting a little with it.

Have you checked the plug(s) lately? Sometimes lots of things combined will cause one small problem. I didn't mean to write a book here. If you do all these things and it runs okay now, and after you finish you change plug(s), and when it gets cold again (next day) try and start it again with the choke. Make sure the throttle is moved up about 2/3 of the way.

If you run into the same backfiring problem, it's time to take it in to see the doc. Probably air/fuel misture is off, and that's why it backfires when you choke it. Good luck!

Sirwriter

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