0 Throttle Response - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 58 (permalink) Old 11-02-2010, 04:18 PM Thread Starter
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0 Throttle Response

I have an 08' Yamaha Vstar here with 550 miles on it. Bike was parked for estimated time frame of 1 year. Carbs have been cleaned, tank has been cleaned, oil changed, plugs changed and the bike will not run on its own. Replaced a faulty fuel cut off solenoid as well as the air/fuel screws (they were about rusted in).

Currently if the air intake is heavily restricted the bike will run and have excellent throttle response. On its own assembly the bike will not move above idle.

It appears as if the bike is choking from too much air. The A/F screws are set at 3 turns out and have tried a range from 2-4 turns out with the same results.

Any input is appreciated.
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post #2 of 58 (permalink) Old 11-02-2010, 05:19 PM
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Does it get any better with the activation of the Choke/Enrichener?

GW
2005 1100 Custom
Speedster Slashdowns
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
AIS Removed/Plugged
Wimmer Machine Custom Oil Cooler & Stash Tube
Pro-1 Tach
Dyna 3000 Step 5/ 6500 redline
TPS Connected
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front

10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...
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post #3 of 58 (permalink) Old 11-02-2010, 06:04 PM Thread Starter
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It does not get better with the choke on. The only way the bike will run is to block off the air intake by about 90%
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post #4 of 58 (permalink) Old 11-02-2010, 06:27 PM
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what do the plugs look like? Are you getting a steady stream of fuel when you open the carb bowls with the key on? Have you replaced the filter? Have you checked for a pinched fuel line?

GW
2005 1100 Custom
Speedster Slashdowns
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
AIS Removed/Plugged
Wimmer Machine Custom Oil Cooler & Stash Tube
Pro-1 Tach
Dyna 3000 Step 5/ 6500 redline
TPS Connected
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front

10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...
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post #5 of 58 (permalink) Old 11-02-2010, 06:34 PM Thread Starter
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Quote:
Originally Posted by Fulltilt1 View Post
what do the plugs look like? Are you getting a steady stream of fuel when you open the carb bowls with the key on? Have you replaced the filter? Have you checked for a pinched fuel line?
Plugs have been replaced.
Steady stream from the drain on both carbs.
Air Filter has been replaced.
The bike is running off an aux gravity fed fuel tank , not the main gas tank.
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post #6 of 58 (permalink) Old 11-02-2010, 09:18 PM
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I think you are gonna need to pull the carbs back apart again. Did you have the Slides out when you cleaned them the first time? Could they be stuck? Did the small o-rings go back in with the slides?

Sorry about any delays I'm at work.

GW
2005 1100 Custom
Speedster Slashdowns
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
AIS Removed/Plugged
Wimmer Machine Custom Oil Cooler & Stash Tube
Pro-1 Tach
Dyna 3000 Step 5/ 6500 redline
TPS Connected
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front

10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...

Last edited by Fulltilt1; 11-02-2010 at 09:20 PM.
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post #7 of 58 (permalink) Old 11-03-2010, 04:43 PM Thread Starter
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Pilot Jets enlarged and the bike will now have response off idle and keep idle. However at about 50% throttle the bike will choke out and die.

The main jets have been enlarged as well, needles shimmed at 4 down from the top.

The bike will run great with the airbox blocked off by about 90%.

None of this makes a lick of sense. The bike is running lean in mid/high range, extremely lean. Vance and Hines exhaust and K&N filter.

Jetting calls for a #120 main. Stock is #90. These are drilled out to .044 . Its almost as if it wants them to be huge.
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post #8 of 58 (permalink) Old 11-03-2010, 05:07 PM
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You need to clean your carbs again.
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post #9 of 58 (permalink) Old 11-03-2010, 05:09 PM
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Make sure you don't have leaks on intake side of carbs between engine and carbs.
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post #10 of 58 (permalink) Old 11-03-2010, 05:22 PM Thread Starter
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Carbs are spotless. This is the 5th time they have been off the bike and gone through hoping something was inside. No intake leaks or vacuum leaks.

From the mikuni conversion to inches we are at a 110 main jet size currently. Plan on drilling out to about a 120 main in the morning. With the airbox removed we taped up the inlet to gauge the level of lean the bike is running. Its not a great sign as about 90% of the airbox is taped up and the bike runs great.
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