Road Star Forum
Welcome, Guest
Please Login or Register.    Lost Password?
Re:New to me bike won't rev under load
Go to bottom Post Reply Favoured: 0
TOPIC: Re:New to me bike won't rev under load
#1011197
SKWEARpeg (User)
Platinum Boarder
Posts: 12732
graphgraph
User Offline Click here to see the profile of this user
Gender: Male Location: Milton, Florida Birthdate: 1958-00-00
Re:New to me bike won't rev under load 4 Months ago  
Drain the old fuel from the tank and the bowl drain on the carb, and replace it with 5 gallons of fresh, and a 16 ounce can of Seafoam. Leave the bowl drain open, and with a tube attached to the bowl drain, and the other end in a container, turn the key to on and let the pump flush the fuel filter and system with the new fuel. About a half gallon should be more then enough.
Start the bike and let it run for a bit and try reving it some like in the video, and then shut it off and let it sit over night, and then try it again. I'm amazed it even runs because the Pilot circuit is usually blocked to the point of needing to completely strip the carb by this time.

It should be spitting fuel up around the needle big time as the slide rises, and fuel should be spitting out the end of the brass tube, when you roll the throttle.
 
Logged Logged  
  The administrator has disabled public write access.
#1011279
JDS (User)
Fresh Boarder
Posts: 51
graphgraph
User Offline Click here to see the profile of this user
Re:New to me bike won't rev under load 4 Months ago  
SKWEARpeg wrote:
Drain the old fuel from the tank and the bowl drain on the carb, and replace it with 5 gallons of fresh, and a 16 ounce can of Seafoam. Leave the bowl drain open, and with a tube attached to the bowl drain, and the other end in a container, turn the key to on and let the pump flush the fuel filter and system with the new fuel. About a half gallon should be more then enough.
Start the bike and let it run for a bit and try reving it some like in the video, and then shut it off and let it sit over night, and then try it again. I'm amazed it even runs because the Pilot circuit is usually blocked to the point of needing to completely strip the carb by this time.

It should be spitting fuel up around the needle big time as the slide rises, and fuel should be spitting out the end of the brass tube, when you roll the throttle.


What size tubing to fit float bowl. I'm sorry I'm not going out to measure and find out myself, but things are a bit hectic at home but I'll have the chance to run to a hardware store soon.
 
Logged Logged  
  The administrator has disabled public write access.
#1011281
SKWEARpeg (User)
Platinum Boarder
Posts: 12732
graphgraph
User Offline Click here to see the profile of this user
Gender: Male Location: Milton, Florida Birthdate: 1958-00-00
Re:New to me bike won't rev under load 4 Months ago  
Its small. Pick up about two feet each of the 1/8 ID and the 3/16 ID clear poly tubing. A lot of HW stores will carry it in bulk and just cut off what you need.
When its on the bowl drain, open the bowl drain screw until you get a good flow of fuel in the hose. When you tighten the drain screw back up, snug is good, don't be an animal.
 
Logged Logged  
  The administrator has disabled public write access.
#1011301
JDS (User)
Fresh Boarder
Posts: 51
graphgraph
User Offline Click here to see the profile of this user
Re:New to me bike won't rev under load 4 Months ago  
O
M
G

carb cleaned as soon as sea foam hit it.

Revving up now, and I think my ears are bleeding with how load she is. She comes off idle smoothly now, no sputtering.

Now to take it out tomorrow and put her under a load and see the power of this beast.

Thank you very much.

FYI I drained it from the Petcock because even after some research I couldn't find how to easily drain the float. Then ran it for a bit to get old fuel out of the lines and bowl.
 
Logged Logged  
 
Last Edit: 2017/05/20 20:00 By JDS.
  The administrator has disabled public write access.
#1011302
SKWEARpeg (User)
Platinum Boarder
Posts: 12732
graphgraph
User Offline Click here to see the profile of this user
Gender: Male Location: Milton, Florida Birthdate: 1958-00-00
Re:New to me bike won't rev under load 4 Months ago  
Good!

If you look at some of the carb articles on the Tech Articles page at the top next to the Forum tab, you'll find some help in the form of pics and diagrams.
 
Logged Logged  
  The administrator has disabled public write access.
#1011681
JDS (User)
Fresh Boarder
Posts: 51
graphgraph
User Offline Click here to see the profile of this user
Re:New to me bike won't rev under load 3 Months, 4 Weeks ago  
Ok, still have the issue. It clears up a tad bit on occasion, but is there for the most part. Sometimes it's not too bad, I can get the bike up to 80 smoothly, sometimes I can't keep her above 50 in 5th.

Definitely sounds like fuel starvation, maybe trash in the carb? I've put 50 miles or about on her today, so if it where gunk the sea foam should've taken care of it by now.

Question: can the bike operate at all with the fuel pump dead, with just clearance flow past it, or does no fuel get past it if it is dead?

I'm thinking it may be rebuild time
 
Logged Logged  
  The administrator has disabled public write access.
#1011685
txulrich (User)
Platinum Boarder
Posts: 2659
graphgraph
User Offline Click here to see the profile of this user
Gender: Male Location: Dallas, TX Birthdate: 1957-04-21
Re:New to me bike won't rev under load 3 Months, 4 Weeks ago  
JDS wrote:
Ok, still have the issue. It clears up a tad bit on occasion, but is there for the most part. Sometimes it's not too bad, I can get the bike up to 80 smoothly, sometimes I can't keep her above 50 in 5th.

Definitely sounds like fuel starvation, maybe trash in the carb? I've put 50 miles or about on her today, so if it where gunk the sea foam should've taken care of it by now.

Question: can the bike operate at all with the fuel pump dead, with just clearance flow past it, or does no fuel get past it if it is dead?

I'm thinking it may be rebuild time


You can easily test the fuel pump by bypassing it with a piece of tubing directly to the carb. If it makes any difference at all then you'll have your answer.
 
Logged Logged  
 
Peace,
Baron Wilhelm Gustav von Schmidtt III
(but you can call me Joe)

  The administrator has disabled public write access.
#1011688
davej (User)
Platinum Boarder
Posts: 17912
graphgraph
User Online Now Click here to see the profile of this user
Gender: Male Location: Toledo Ohio Birthdate: 1957-00-00
Re:New to me bike won't rev under load 3 Months, 4 Weeks ago  
If the fuel pump quits working so does the bike. like said run a line directly from the tank to the carb. that will bypass the filter and pump if it runs OK then change the filter. you may have a bunch of crap floating around in the tank and into the filter. A plugged filter will give you the symptoms you have. also there is a small strainer in the inlet tube on the carb you can check for garbage there when you pull that line to bypass the other items.
 
Logged Logged  
 
dave
  The administrator has disabled public write access.
#1011689
txulrich (User)
Platinum Boarder
Posts: 2659
graphgraph
User Offline Click here to see the profile of this user
Gender: Male Location: Dallas, TX Birthdate: 1957-04-21
Re:New to me bike won't rev under load 3 Months, 4 Weeks ago  
davej wrote:
If the fuel pump quits working so does the bike. like said run a line directly from the tank to the carb. that will bypass the filter and pump if it runs OK then change the filter. you may have a bunch of crap floating around in the tank and into the filter. A plugged filter will give you the symptoms you have. also there is a small strainer in the inlet tube on the carb you can check for garbage there when you pull that line to bypass the other items.

Good point! Why is it that we always overlook the easy things and go straight to the complex. Change the filter first, then bypass the pump.
 
Logged Logged  
 
Peace,
Baron Wilhelm Gustav von Schmidtt III
(but you can call me Joe)

  The administrator has disabled public write access.
#1011691
JDS (User)
Fresh Boarder
Posts: 51
graphgraph
User Offline Click here to see the profile of this user
Re:New to me bike won't rev under load 3 Months, 4 Weeks ago  
txulrich wrote:
davej wrote:
If the fuel pump quits working so does the bike. like said run a line directly from the tank to the carb. that will bypass the filter and pump if it runs OK then change the filter. you may have a bunch of crap floating around in the tank and into the filter. A plugged filter will give you the symptoms you have. also there is a small strainer in the inlet tube on the carb you can check for garbage there when you pull that line to bypass the other items.

Good point! Why is it that we always overlook the easy things and go straight to the complex. Change the filter first, then bypass the pump.


If it is the fuel filter I'll kick my own ass for y'all. Picking one up after work. Wix 33011? Or is there a better suggestion?
 
Logged Logged  
  The administrator has disabled public write access.
Go to top Post Reply
Powered by FireBoardget the latest posts directly to your desktop
...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... -->
New Forum Posts




The Road Star Clinic is a collaborative community of riders who archive and publish user contributed technical data about Yamaha Road Star motorcycles.

We also sponsor the creation and support of other community websites similar to our own. Inquiries about availability of a website for your community can be submitted to us via any "Contact Us" option on the Clinic.

Copyright 2003-2007 Road Star Clinic and its respective authors. Road Star Clinic is sponsored by the folks at MLSHomeQuest.com.