Question about 2004 Yamaha V Star 1100 Classic

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2004 vstar 1100 has a hypercharger,120&122.5 jets in carb,bub exhaust pipes at 3/4 to full throttle starts to lose power & misfire,below 3/4 throttle runs ok. Adjust valves to .004 intake,.006 exhaust replace spark plugs . Still bogs down at full throttle,hard to pass cars in this condition.

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Hi, Ken5bro and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking.
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Fuel tank vent system plugged or carburetor vent line closed off.
12. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
13. Carburetor controls misadjusted.
14. Damaged carburetor.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Losing power bogging on Freeway High RPM Scary Help Please
OEM parts for Yamaha

Posted on May 29, 2016


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Posted on Jan 02, 2017

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SOURCE: Will not run without choke

have you checked for vaccuum leaks at the intake manifold? you can check by pouring water over the gasket area when/ if you get it running!

Posted on Jun 14, 2009

  • 6 Answers

SOURCE: I have a vstar 1100 motorbike that is back firing

did you get it checked for cylinder pressure? take out spark plugs, clean them out and observe for any oil or deposits

Posted on Jul 13, 2009

  • 159 Answers

SOURCE: yamaha yzf750r missfire rough running

Try taking air cleaner off before going to far, Blow carbies with air, dont use full force I done this to mine and it fixed it you may be lucky dirty jets.

Posted on Jan 10, 2010

  • 224 Answers

SOURCE: What is the difference between the 2005 VStar

there is no difference in the motor and everything is interchangeable. the only difference between the two is the air fuel mixture settings in the carbs. California has certain EPA emissions standards the bike has to meet so the settings are set a bit leaner than other states that don't have to meet the same requirements. if you get a California model you can adjust the carb settings to be the same as a regular model anywhere else.

Posted on Jan 12, 2010

  • 409 Answers

SOURCE: i have a 2001 Yamaha Vstar 1100 motorcycle with a

The backfire is normal, the only cure is to put the baffles back in.

Posted on Apr 02, 2010

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1 Answer

2000 650 vstar with hardkrome pipes and hypercharger. What would be the proper main jet and pilot jet sizes

Use a DYNAJET kit & go with the directions. Or check with the Hypercharger manufacture for correct jetting. But you will still need different needles & main jets for those pipes.

Jan 18, 2014 | 2001 Yamaha XVS 650 Dragstar Classic

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I have a 2006 v star 1100 with aftermarket pipes and a jet kit installed. It sat for months and I rebuilt the carbs. Now the bike will only idle with the choke on, are my carbs out of sink?

Hi, Lancer 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.
2004 Vstar idle only on full choke problem
Idling and stalling problems carbs problem Choke always has to be in
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Nov 07, 2012 | 2002 Yamaha V Star 1100 Classic

1 Answer

S reg aprilia rs 125 derestrited misfires between 5500 and 7200rpm then takes off like a rocket its a 122 with 28mm carb starts and idles great checked jet in bowl bolt says 120 cdi bin cut power valve...

You have upset the air fuel flow by changing the exhaust, I would try placing a piece of paper over the air filter to change the intake first, to see what happens, then if that doesn't work, you will need to rejet, and sometimes the factory setting won't work, so you will need an adj jet, Find an aftermarket for your carb I think dyno tune has one. They work great. I hope this helps.

Jul 31, 2009 | 1998 Aprilia RS 125 Extrema

1 Answer

Dj683 i installed bub pipes on my 2000 yamaha

I too had this popping back fire on my 2004 Yamaha 1100 custom.
Seems the AIS system is causing this.

This site has an excellent PDF file and instructions.
There is also a simple way to block of the AIS without stripping it off the bike. Reversible too!
(Usually my first choice to see if the desired results are achieved.)

Good luck!
Loved my BUB pipes too!

Jul 12, 2009 | 2006 Yamaha V Star 1100 Custom

2 Answers

At speedes of 110-120 starts to loose power

Is it all stock or have you added a pipe or a hi performance air filter? If you have, it needs bigger main jets, if not try cleaning out the filter in the gas tank and screen in the petcock, if it has one

Jun 17, 2009 | 2001 Yamaha V Star 1100 Classic

1 Answer

2007 650 yamaha vstar popping through the rear cylinder exhaust

First off did you buy it new? Second has it gone through its break in tune up yet?Did you do the re jeting? My guess is it was re jeted wrong & neeeds to be re jeted again or could also need more air(upgraded air kit) or a tfi or power comand fuel mod.My bike also poped untill I did the air & fuel upgrades & them upgrades will also give you a much needed house power needed for this rig.

Bring it to a shop & have it looked at.......

Good luck

Apr 25, 2009 | 2003 Yamaha V Star 1100 Classic

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