I have an 08 Mastiff. My bike runs fine on a full tank but after exactly 65 miles the bike hesitates on acceleration as if it has vapor lock. I have a vented gas cap and I've disconnected my fuel line and the gas flows fine. There's also a few gallons of gas left in the tank. After about 70 miles, the bike acts as if it's out of gas and I stall. Sometimes it will restart and other times I end up pushing it to a gas station. I'm guessing that it could be an issue with the carburetor but I'm not a great mechanic. Any thoughts are appreciated. Thanks in advance.
Need Advise- Stalling and Hesitating
- Thread starter montana
- Start date
No, I've only got about 5K on the bike and I didn't think I needed it. Also, I've dealt with fuel filters in the past. The hesitation I'm experiencing is similar to a fuel filter problem but the bike runs fine for the first 65 miles. If the filter were clogged, wouldn't it hesitate all the time? Please educate me.
avdhunter
Active Member
No was asking because some have put filters on and as the tank got lower they started having fuel starvation issues. Most filters don't have enuff flow rate to them for these bikes. Think people have had good luck with the Pingel. That was why I was asking.
BigDogBro1
Made in the USA
Look down through the tank bung with a flashlight. The tank liner should be adhered securely to the interior of the tank wall. Be careful when refueling not to damage the liner at the backbone saddle when placeing the gas nozzle into the tank.
See if you can remove the fuel line somewhere where easy access and get free flowing gas through it. Not sure if the carbed bikes have a fuel screen at the petcock which may be clogged with pieces of tank liner. My EFI "07" Bulldog has no petcock on the tank at all.
On my replacement gas cap there was a white screwed in plastic cover that I removed because my original one didn't have it and it looked like it was sealing the cap vent passage.
See if you can remove the fuel line somewhere where easy access and get free flowing gas through it. Not sure if the carbed bikes have a fuel screen at the petcock which may be clogged with pieces of tank liner. My EFI "07" Bulldog has no petcock on the tank at all.
On my replacement gas cap there was a white screwed in plastic cover that I removed because my original one didn't have it and it looked like it was sealing the cap vent passage.
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Thanks. I'll try that over the weekend.
JUST THOUGHT I'D GIVE AN UPDATE. I TOOK MY FUEL LINE OFF TODAY AND THE GAS FLOWED FINE. I DECIDED TO REMOVE MY PETCOCK AND SEE IF ANYTHING WAS HAPPENING. THE PETCOCK FILTER WAS CLOGGED WITH GREEN PAINT FROM THE TANK LINER. SORRY FOR THE POOR PHOTO. I TOOK IT AFTER I REMOVED MOST OF THE PAINT BUT YOU CAN SEE A LOT OF IT AT THE BASE. MY BIKE IS ONLY A YEAR OLD SO I ASSUME THIS WILL BE A WARRANTY ISSUE. THANKS FOR ALL THE HELP.
Dozer1
Active Member
Deathstar88
Active Member
how hard do you have to blow thru the gas cap to make it vent? I had to use a good amount of blow force to make it vent. should it be easy? or does it take alot of pressure?
probably no more than about 15#. it's purpose is to balance the internal pressure with the atmosphere without releasing fumes so depending on your elevation, sea level is what 14.7 psi, getting less as you go up.
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mymofoname
Member
I've been having the same problem with my '05 Pitbull, the fuel mileage has gone from 95 to 85 miles then it stalls. But when I check the tank for gas it is still visible!. I have checked the cap for proper ventilation, petcock is clear of debris, fuel line from tank to carb is clear,tank liner is fine, so what should be my next step? does the carb have a filter on the inside? also when I fuel up the tank only takes about 2 1/2 gallons to fill up and I know the specs say 4.5 capacity. It's driving me CRAZY!! Any suggestions??
Hold your hand up. Pull down your 3 fingers so your middle and index fingers are the only ones standing up vertical. Now, place a horizontal line across the top of the index finger. This more or less shows you the main [middle] full level from the gas cap on down to there.
You are now at reserve level and is not flowing. So you stall out, walk the bike to the gas pump, fill your 2 point gallons and you know it's a 4 gallon tank, but only takes 2 gallons each time.
Either you did not know you had RES as your reserve lever moving in 3 directions? Pick a horizontal side is the OFF. Straight down is ON. Swing the petcock lever to the other horizontal side and it is now in RES.
But if say the screen is clogged for reserve to empty right to the very bottom of that green paint settlement on page 1, there is your clogging if say you do turn the petcock to RES and nothing happens, she still fills up with 2 point whatever gallons all the time and stops running @ 65/85 miles each time is your average mileage for the ON position only = RES is clogged.
Make sense?
You are now at reserve level and is not flowing. So you stall out, walk the bike to the gas pump, fill your 2 point gallons and you know it's a 4 gallon tank, but only takes 2 gallons each time.
Either you did not know you had RES as your reserve lever moving in 3 directions? Pick a horizontal side is the OFF. Straight down is ON. Swing the petcock lever to the other horizontal side and it is now in RES.
But if say the screen is clogged for reserve to empty right to the very bottom of that green paint settlement on page 1, there is your clogging if say you do turn the petcock to RES and nothing happens, she still fills up with 2 point whatever gallons all the time and stops running @ 65/85 miles each time is your average mileage for the ON position only = RES is clogged.
Make sense?