Question about Honda CRF 150 F Motorcycles

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I have the bike running.won't hold an idle and runs better with the choke on,even after warmed up.help on adjustments

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You have a vacumm leak.

Posted on Aug 02, 2009

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Only runs with choke on


Hi, Jeff 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. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting ***** set too low.
8. Air/fuel mixture ***** set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
What could be wrong if bike will only run on choke
Only Runs When Choke is On
Bike only runs with choke on Intake Jetting Fuel Injection
Oakys Garage Carb clean Pilot Jet clogged Won run without Choke Carbs 101

Apr 05, 2016 | Red Motorcycles

1 Answer

Idles with 1/2 choke. If open choke, or throttle - engine dies without any RPM spike. Carb was cleaned, jet is clean. When idles, there is gas in the primer bulb.


Hi, Andrew 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. Float needle and seat sticking.

5. Float level too low.

6. Carburetor bowl vent line clogged/blocked/pinched.

7. Idle adjusting screw set too low.

8. Air/fuel mixture screw set too lean.

9. Idle port, transfer ports, slow air jet clogged.

10. Slow fuel jet clogged.

For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.

Bike won Run without Choke

Dirt Rider Magazine

Bike starts up idles on choke dies with choke off our when warm XS650 Forum

What could be wrong if bike will only run on choke

Mar 10, 2016 | GAS Motorcycles

1 Answer

Will not stay running after choke closed


Hi, Anonymous 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. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting ***** set too low.
8. Air/fuel mixture ***** set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below Good luck and have a nice day.
Re Bike will not idle with out choke Road Star Forum Yamaha Road Star
Oakys Garage Carb clean Pilot Jet clogged Won run without Choke Carbs 101
http://www.yamahaventure.nl/pdf/servicemanualxvz13tf.pdf
OEM parts for Yamaha
http://www.yamahaventure.nl/pdf/ownersmanualxvz13tf.pdf

Apr 22, 2014 | 2007 Yamaha Royal Star Venture

1 Answer

When to adjust idle


If you can keep the bike running long enough to get it warm with and with no choke then that is when you should adjust the mixture,
First though start by adjusting it cold so the screw is set at about 1.5-2 turns out then run till warm set idle at around 1500 revs and adjust until it just starts to lift the revs then back off a quarter turn

May 02, 2013 | Yamaha Motorcycles

1 Answer

Motorcycle starts on full choke but will not run even given more fuel even if the choke is turned off after warm up


Hi, Edward 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. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
Bike won Run without Choke
Yamaha XV535 runs only on idle choke
Yamaha XV 535 DX Virago Service Manual
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2005/LIT-11626-18-21_1000.pdf

Nov 13, 2011 | 1994 Yamaha XV 535 Virago DX

1 Answer

Honda Shadow VT750 will not idle without choke on


Hi, Epperson2420 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.
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.
Need Help Bike won run choke in
Starts but won stay running unless with choke Discussion
Honda 1998 VT750C Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda VT750C Owner Manual

May 01, 2011 | Honda VT 750 CD Shadow A.C.E. Deluxe...

1 Answer

1982 Yamaha Maxim 650 Has trouble starting: on a good day i can turn the choke midway and it will fire right up, but i have to roll the throttle back and forth to keep it running. after a few minutes...


These bikes need the carbs ajdusted rather frequently, once they get out of adjustment the they juste don'e idle good. Also as old as this one is I can guess that you may have some air leaking around your some of the gaskets and this is why after it warms up it runs better, the gaskets get heated and the swell a little and then start sealing better. It would do you good this winter if you replaced all your intake and carb gaskets and get the carbs adjusted by a trained technicianan you will be ready to roll when summer comes around.

Nov 19, 2010 | 1982 Yamaha XJ 650

1 Answer

18"poulan chainsaw


Start at 1.5 CCW form lightly seated then tune for performance like this:
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.

I think your starting procedure may be the cause of flooding. Flooded is the #1 cause of hard starts in 2-cycle engines. Read carefully the recommended start in your manual. most miss the second note. It should be similar to this (read 3, read it again):
Warm start in the manual says 1/2 choke BS. Close choke, (sets fast idle) open choke, pull rope.
Start Procedure
Cold:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4).
  4. Set compression release – optional step even if saw is equipped with a compression release.
  5. Push (open) choke pull starter until it starts (usually first pull).
Warm:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) – Do not pull with choke closed.
  4. Push (open) choke, pull starter until it starts (usually first pull).
If you still have trouble reply as you did before. I will get back to you. HTH
Lou

Feb 18, 2010 | Poulan Garden

1 Answer

FR- 2.0 14'' Factory Reconditioned My


I am going to assume you are following the warm start procedure in your manual. Most start problems with 2-cycle engines are caused by flooding.

Before you shut if off roll it to the side and loosen the fuel cap (vent tank - leave it loose until restart) Better? Repair fuel vent. No better carburetor needs small adjustment. This explains it better than I can but you will need to experiment some.
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.

Just because this is the most likely cause:
Start Procedure
Cold:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4)
  4. Set compression release – optional step even if saw is equipped with a compression release
  5. Push (open) choke pull starter until it starts. (usually first pull)
Warm:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) – Do not pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull)
I hope you found this helpful. You can reply below if you need additional help.
Lou

Jan 17, 2010 | McCulloch Garden

1 Answer

GAS MILLAGE


wrong size jest eg main jet shoukld be .1xx, but the shop fitted the largest optional one, as that is what they had. A change from a .112 to a .108 makes a huge change. Don't know if the CB650 carbs had a needle that could have its position changed? Soft tires, dragging brake, even VERY slightly, bad wheel bearings, clogged air filter (wash and oil, or a new one)

Nov 20, 2008 | 2007 BMW K 1200 LT

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