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03 HD 1200 sportster only starts with choke out And only idles, dies if trying to give any throttle Fresh gas in it, jets clean out, 1557.0 mils on it Vac slide on carb dosent move when trying to throttle it. Help please

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Sounds like the cable is off of the slide they come off sometimes when re installing

Posted on Dec 02, 2014


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Troy Bilt 3090 snowblower surges off choke, doesnt surge on choke, cleaned the carb, jets, float, drained tank, cleaned fuel filter, fresh gas, still surges. Could it be the governor or idle jet?l

you could try opening up the idle/mixture screw another turn to make the transmission from idle to throttle better
governors just open the throttle butterfly according to the spring tension setting from the throttle lever

Dec 16, 2016 | Troy-Bilt Storm 2840 277cc 28-in Two-Stage...

1 Answer

03 1200 only starts with choke all the way out and stays out to keep it idling, can not give it any throttle or it dies, push choke in any at all it dies Only has 1557.0 mils on it, fresh gas in it, vac...

Hey LD,

Bummer. Sounds like one of a couple of things... You did not specify what BRAND your bike is, but with the slide comment, I presume a Mikuni or similar type of carb.

So the artificial enrichment circuit is actuated during choke operation. This circuit only works with the throttle plates in the IDLE position. ANY throttle and that circuit drops out of the picture and the idle/slow/main jet circuits take control.

You COULD have a huge vacuum leak, and that would cause what you describe. Look carefully, squirt bottle some water around the intake/carb/manifold areas. Any change in idle is suspect. But you may not be able to achieve this, based on choke only operation.

SO, my thought is something is plugged in your carb. This happens with old gas and stagnation. Often the enrichment circuit will flow, but not the idle circuit. The only remedy is surgery. Typically you pull the carb(s) so you can inspect well on a bench. Pull the float bowl and look for foreign material of any kind. I have seen moss like growths in there... Perform an overhaul, with the long submersion, followed by flushing and high pressure air..

There is one other, fairly Bonsai method that works: You fire up the bike, with the air cleaner off.... Get as much engine speed as you can... One hand on the throttle, ready to open, and briefly cover the entire carb intake with the palm of your hand, at the same time, you need lots of throttle. What this does is sometimes dislodges a blockage. Really works well on lawnmowers. This takes a time or two for you to get everything synced, but you need lots of throttle and full intake air restriction. Sometimes works, sometimes not. I always worried about being successful as that means there is some chunk of something floating around somewhere in my carb. I would perform surgery.

I hope this helps.


Dec 01, 2014 | Motorcycles

2 Answers

2003 harley 1200 custom sportster with 50 miles strats up fine with choke pulled out. once engine is warm and choke is pushed in 50% bike stalls out. have repalaced gas, spark plugs and just took apart...

A 2003 model with only 50 miles?? Wow....well,since youve already taken the carb apart and cleaned it,did you hook up the vaccum line for the VOES switch on the intake manifold? If so,..when you get the bike running,..spray some brake clean around the intake where it bolts to the heads.If the idle picks up,or starts to sputter,..youve got leaking intake gaskets. Which is a good possibility on a bike that old with that few miles on it.The choke essentailly adds more fuel to the motor,and by what your saying,the bike is obviously running lean. Also, ASSUMING that you have fresh gas in it,and the petcock is turned on.

Sep 25, 2012 | 2003 Harley Davidson XL 1200 C Sportster...

1 Answer

I have a 96 yamaha virago xv250. It cranks, and idles fine. The problem is, once you start riding and get into first, you get about halfway down on the throttle and it's like the engine is dying out,...

It sounds to me like your main jet or high speed circuits could be plugged up in the carb(s) or you could have water in the fuel. If you are reasonably mechanically inclined, I would suggest removing the carbs and giving them a good cleaning. You might want to give it a fresh set of plugs and a new air and fuel filter while you are at it.

Sep 12, 2011 | Yamaha Vino Motorcycles

1 Answer

1992 Honda CB 750 Nighthawk will not idle without choke

Hi, Emeraldcp and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
13. Faulty auto choke or wiring connection.
For more information about your issue and valuable "Free" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Bike won Run without Choke
Oakys Garage Carb clean Pilot Jet clogged Won run without Choke Carbs 101
Honda Nighthawk CB 750 1991 Service Manual
Honda CB750F2 Owner Manual

Sep 26, 2010 | 1992 Honda CB 750 Nighthawk

1 Answer

Bike starts right up in choke take it off choke shuts off

when you rejetted, did you also change the idle jets or just the main jets? if you didn't change the idle jets, that would probably help. remember you might also want to raise the float level height just a little bit to compensate for the extra fuel going out.

May 14, 2010 | 1993 kawasaki VN 750 Vulcan

1 Answer

Engin wont stay running

was there trash in the old filter? If so let it be your guide on what to expect.Clean the carbs out, get the trash out of the needle and jet and the needle seat. Also make sure the tank is clean too.You do not have to remove the carb to clean it,just the airfilter housing and fuel bowl.Then you can remove the float the float-needle and jet. Remember no fuel will run out of the tank unless fuel cut off has a vacuum on the small vacuum line going to it.

Apr 20, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Idles ok with choke out but wont run any higher

the carbereter jets are blocked up,, strip it out and clean them out
but dont go pokeing a bit of wire into any jets or you will distroy them
if jets are blocked the bike will normaly only run with full choke on

Feb 21, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

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