Question about 1982 Yamaha XS 400 Special

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Takes way to long to warm up

Require to have full choke, and takes approx 15 minutes to warm up. my left pipe is hot during this and my right pipe is cold. do i have a stuck exhaust valve? i also noticed my plug is black, still charging a spark, but a power loss is highly noticeable.

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Hi the xs400 was known for carb problems the diophrams in the top of the carbs look for holes in them

Posted on Jun 21, 2009

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I have an '85 S-10 Blazer with a 2.8 V6 automatic transmission, it has a high idle and a dieseling problem, the previous owner removed the fuse for the automatic choke, how can I reduce the idle?


Dieseling or running-on is a fairly natural consequence of an engine that is idling too fast or being switched off before the idle has been restored after being revved.

Changes to engine design to improve acceleration and economy and meet new emission regulations required higher idle speeds and dieseling became a common problem which required the introduction of a fuel cut-off solenoid on many carburettors.

Dieseling is sometimes the result of overheating or too much carbon in the combustion chamber.

The design changes mentioned above required changes to carburation, including the choke design and operation. Complying with new emission regs required a quick engine warm-up and for the automatic choke to disengage in about two minutes. A higher fast idle was also required and mostly at least one vacuum servo was used to ensure smooth running during the warm-up period.

In order to disengage the choke quickly, it was often arranged to be heated, either by electricity alone or by electricity and hot water.

If the fuse has been removed the choke will not work correctly. Why the previous owner removed the fuse is a mystery, perhaps there is a fault.
The choke must be put back into good operation in order to achieve proper fuel economy and smooth running, or alternatively the carburettor could be converted to manual choke.

Apr 30, 2017 | Cars & Trucks

1 Answer

IF THE CHOKE IS PULLED OUT APPROX 1/2 INCH ACCELLARATES OK CEPT FOR A POP NOW AND THEN HAS STRAIGHT PIPES.


Spark plugs are right color- due to 'drag pipes your bike no longer has the 'backpressure' required and this will result in pops and backfires when throttle is 'let go'- put factory pipes back on and it'll probably run like a champ-those hondas run forever-just don't **** around with factory specs-they don't respond well-if your lookin for a Harley sound-buy a Harley-if you want cheap reliable transport-leave your honda stock, good-luck.

Nov 10, 2012 | 1997 Honda VT 600 C Shadow

1 Answer

I just bought a Husqvarna 150 BT blower today. It will not run when I open the choke back up (open / off choke). It only runs in full choke (choke close position). I let it warm up for ten minutes or...


I'm assuming this is a new purchase. You may want to take it to a dealer and have the carb. fine tuned. Sometimes they can be a little off right out of the box. Hope this helps.

Feb 28, 2011 | Garden

1 Answer

When I first start my 84 Honda V65 SABRE, after its been sitting overnight or longer. I full choke it then start it. It idles very slow and almost stalls if I give it throttle it stalls. If I just leave it...


check for a vacume leak, as its been along time since i've looked at one of these is there a vacuum pipe on the distributor, this is the advanced timing if it has one on this engine, there is a diaphragm in this that over time can leak, this leaking would make hard starting on cold start if its failing.

Aug 15, 2017 | 1985 Honda VF 1100 Sabre

1 Answer

2006 TTR250. Bike will not idle unless choke is fully engaged. After a minute or less of this the head pipe (the one that comes right off the block, I don't know if I have the name right) becomes glowing...


two things you have to oberved. Choke is only applicable if you experience hard starting in the morning,If yes then use choke for a while till you got your motor idling stage.the glowing red hot indicates that your engine is flaming hot, this means your choke is steadily on.( never stay your choke steadily on.).Try to clean your carb , carb cleaner will do. even without dismantling your carb from the engine manifold.Rev your throttle and spray through the air intake, you'll notice a foul sound bcoz the cleaner is mixing with your gas,it's fine.also you'll notice a black smoke while doing a full rev. it's also fine , thats the carbon that need to push out from your carb. take it from there my friend ...let me know the result.observed your bike

May 26, 2010 | 2002 Yamaha TT-R 250

3 Answers

Kohler small engine problem


1989 Kohler 20 backfires through the exhaust. What are the possible causes?

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1 Answer

DR 200 runs really cold. Takes about 15 minutes or so to warm up


It depends on the tempature, if its pretty chilly out yeah. Try easing the choke in slowly, and when it will idle at about half choke go aheand and take off but run the bike easy for a few minutes then close the choke.

Mar 29, 2009 | 2003 Suzuki DR 200 SE

1 Answer

COLD MORNING


no doubt this bike is running very lean at idle. Thats the way the EPA wants it. Im a harley mechanic and i used to work in a US dealer. all carb bikes at set up time had the carbs "readjusted". We drilled out the EPA plug and turned the idle air screw out and drilled out the pilot jet too. The bikes worked much better. we were at sea level too so the bikes were very lean from the factory. I can imagine that after the new legislation that came into force they are even leaner and require a full warm up to run properly. Warmed up means you put your hand on the motors head and its hot enought to have to jerk it away. this could take more than a couple minutes. and yes our "readjustment" was illegal. i advice you to do the same.

Nov 20, 2008 | 2004 BMW R 1100 S

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