VTR Vacuum Hose problem.
05-09-2009, 11:46 PM
#1
Junior Member
Squid
Thread Starter
Join Date: May 2009
Posts: 14
VTR Vacuum Hose problem.
Hey there
I need help with my 98 VTR.
I just switched back to original gas`tank from my race gas tank.
The race gastank had no petcock, so fuel was flowing straight into carbs.
Now I put back the petcock with the vacuum hose attach at the rear of petcock and to the front cylinder vacuum port (under the carb on the left side).
The bike runs great untill I get to arround 80-90 MPH and keep that speed for about 30 seconds. Then it starts starving and loosing one cylinder.
I have to back off the throttle and it takes about another 30 sec to get both cylinders back again.
It runs fine in the canyons and accelerates great.
It looks like it's not getting enough gas at continous high rpms.
My question:
is the vacuum hose conected the right way?
what's the open position for the petcock switch? it's hard to say from the "on" sign on it since it has no arrow and also it looks like it's not releasing gas withaout the vacuum off and is releasing gas with the vacuum on in all positions.
Thank you
Vtierry
I need help with my 98 VTR.
I just switched back to original gas`tank from my race gas tank.
The race gastank had no petcock, so fuel was flowing straight into carbs.
Now I put back the petcock with the vacuum hose attach at the rear of petcock and to the front cylinder vacuum port (under the carb on the left side).
The bike runs great untill I get to arround 80-90 MPH and keep that speed for about 30 seconds. Then it starts starving and loosing one cylinder.
I have to back off the throttle and it takes about another 30 sec to get both cylinders back again.
It runs fine in the canyons and accelerates great.
It looks like it's not getting enough gas at continous high rpms.
My question:
is the vacuum hose conected the right way?
what's the open position for the petcock switch? it's hard to say from the "on" sign on it since it has no arrow and also it looks like it's not releasing gas withaout the vacuum off and is releasing gas with the vacuum on in all positions.
Thank you
Vtierry
05-10-2009, 06:44 AM
#2
Senior Member
SuperSport
SuperSport
Join Date: Dec 2006
Location: Victoriaville, Quebec, Canada
Posts: 880
Check for vacuum lock, try to open the gas cap, other than that the gas valve turned to full lock is either closed or fully opened, no where in between.
You may have a vac leak, check that vac hose for leaks, it need to run from under the rear carb from the head to the rear of the petcock
You may have a vac leak, check that vac hose for leaks, it need to run from under the rear carb from the head to the rear of the petcock
05-10-2009, 11:16 PM
#4
Senior Member
MotoGP
Join Date: Aug 2007
Location: Way Out West
Posts: 2,547
Yeah. I was confused by your original post. You said front cylinder/left side of bike. Vacuum nipple for front cylinder is on the right, rear is on the left, the one closer to the petcock.
Left/right corresponds to your body's left/right as you are sitting on the bike. Facing forward!
Left/right corresponds to your body's left/right as you are sitting on the bike. Facing forward!
06-11-2009, 04:06 PM
#7
Member
Squid
Join Date: Apr 2009
Location: Dromore, Northern Ireland
Posts: 63
The tap let gas into the front cylinder carb, but not the rear.
Confused me for a while
Paul.
06-12-2009, 05:42 AM
#8
Senior Member
MotoGP
Join Date: Aug 2006
Location: altoona, pa
Posts: 2,934
Last edited by nath981; 06-12-2009 at 05:44 AM.
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