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My yamaha 400vtwin will only start on the choke as soon as i twist the throttle the engine cuts out.

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That sounds like fuel contamination
If she has been standing for more than a few months replace the fuel in the tank & carbs

Ride Safe
Bike-Doc

Posted on Sep 29, 2010

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Adjust the choke or carburetor. In case your chainsaw stalls when the engine is idling, ensure that the choke is set properly. To do so, first try releasing it to adjust it, and then move the plate and tighten all screws once again. To loosen any grit, spray carburetor cleaner spray on the choke's shaft. The carburetor may also need to be adjusted; consult your owner's manual which will guide you on resetting the idle mix screw.

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2003 yz 250 starts and idles but runs rich and bogs as soon as the throttle is applied


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My yamaha 400 dragstar will start easily and run on choke, but as soon as the throttle is touched the engine cuts out, will not start on throttle only on choke.


Hi
That's a fuelling problem
Sounds like she has been laid up for a while -
If more than 5 or6 months then you'll have to drain & replace the fuel from both the tank & carbs
If over a year then you may need to strip the carbs

It could just be sticky floats - try adding a carb cleaner to your fuel

Ride Safe
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1 Answer

I start bike by using choke on cold start after 2 minutes once I push in choke engine stalls can you help?


hi nl friday,

here is a trick i learned from a friend who is a great fan of V twins.

on cold starts he usually opens the drain plug to let the carb balancer / floater set. once a few drops comes out, open the choke then start the engine. right after pushing the choke back, twist the throttle to force the jet to spray out.

hope this will work for you.

regards,

voodoo

May 06, 2009 | 2006 Yamaha V Star Classic

2 Answers

Engine idles fine, stalls soon as its given gas


Hi there!

Open up the carb and clean the jets with pressurized air. I also suspect water on the carburetor reservoir, before opening the carb, drain it first then run. Also, make sure the plugs are clean. Pull on the choke when twisting the accelerator, if it accelerates well, then warm the beast at normal temperature first before twisting the throttle hard again.

hope this helps-
levibit-

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1 Answer

Engine cuts out as you accelerrate when in nuetral.


You might have a coil problem or you might need a sparkplug cupor you need to synchronize your carbs.get your valves check also.

Mar 24, 2009 | 1999 Yamaha FZS 600 Fazer

2 Answers

Engine cutting out with the choke off


Adjust your idle screw on your carb so that it gets more gas just sitting there at idle. Tighten the screw one and a quarter turn and then start the bike. Adjust the idle to where you think it sounds normal. If that doesnt work check your float in your float bowl, it might be stuck in the down position. Clean with some carb cleaner spray and make sure it moves freely before putting the float bowl back on, youll have to choke it or prime the carb again to get it started. All the choke does is let in more gas and oxegen so you might want to check how far the carbs close when you push the choke back in. Is it impeading any normal carb setting. Check that too. Good luck.

Dec 01, 2008 | 2004 Yamaha YZ 450 F

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