Not reving

Cory2000

Cory2000

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Sep 26, 2019
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Got a 2000 Yamaha blaster all stock besides fmf pipe, I start it and it start right up but when I go to start moving and hit the throttle it will rev up till about midrange rpm then stay there for a little bit then when it eventually hits high rpm it goes and revs fine, and it does the same thing when I go bellow high rpm, cleaned the carb put fresh gas in it and still does the same thing ordered new reeds they will be here Tuesday also when I’m in neutral it will rev fine just when in gear and moving
 
Cory2000 said:
Got a 2000 Yamaha blaster all stock besides fmf pipe, I start it and it start right up but when I go to start moving and hit the throttle it will rev up till about midrange rpm then stay there for a little bit then when it eventually hits high rpm it goes and revs fine, and it does the same thing when I go bellow high rpm, cleaned the carb put fresh gas in it and still does the same thing ordered new reeds they will be here Tuesday also when I’m in neutral it will rev fine just when in gear and moving
Click to expand...
Start by doing a leak down test
 
Cory2000 said:
Ok, u think it could be jets tho? I just don’t know why at low rpm it would run fine and high rpm it runs fine just in between it sputters
Click to expand...
Yea I would do a leakdown test and do a plug chop see how she’s running. What size is in there now ?
 
BlasterPlumb said:
Yea I would do a leakdown test and do a plug chop see how she’s running. What size is in there now ?
Click to expand...
Not sure exactly ima look eaither Monday or Tuesday and see, fmf website says to use a 260 jet with there pipe on it does that sound about right? And how do I do a plug chop?
 
Cory2000 said:
Not sure exactly ima look eaither Monday or Tuesday and see, fmf website says to use a 260 jet with there pipe on it does that sound about right? And how do I do a plug chop?
Click to expand...


1. float height ...
https://www.blasterforum.com/threads/float-heights-and-how-to-adjust-them.50565/

2. tune air screw for highest idle ...
https://www.blasterforum.com/threads/adjusting-your-airscrew-pilot-jet.51060/

3. needle clip in middle position < this is what meters 1/4 to 3/4 throttle, (where your bog is)

4. 270 thru 310 mains for FMF pipes depending on elevation, temps, airbox lid/aftermarket filter, and fuel/oil mix or stock injection ?
plug chops....
https://www.blasterforum.com/threads/how-to-plug-chop.53237/

in that order /\
 
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Awk08 said:
1. float height ...
https://www.blasterforum.com/threads/float-heights-and-how-to-adjust-them.50565/

2. tune air screw for highest idle ...
https://www.blasterforum.com/threads/adjusting-your-airscrew-pilot-jet.51060/

3. needle clip in middle position < this is what meters 1/4 to 3/4 throttle, (where your bog is)

4. 270 thru 310 mains for FMF pipes depending on elevation, temps, airbox lid/aftermarket filter, and fuel/oil mix or stock injection ?
plug chops....
https://www.blasterforum.com/threads/how-to-plug-chop.53237/

in that order /\
Click to expand...
Listen to awk ^^^^
 
Awk08 said:
1. float height ...
https://www.blasterforum.com/threads/float-heights-and-how-to-adjust-them.50565/

2. tune air screw for highest idle ...
https://www.blasterforum.com/threads/adjusting-your-airscrew-pilot-jet.51060/

3. needle clip in middle position < this is what meters 1/4 to 3/4 throttle, (where your bog is)

4. 270 thru 310 mains for FMF pipes depending on elevation, temps, airbox lid/aftermarket filter, and fuel/oil mix or stock injection ?
plug chops....
https://www.blasterforum.com/threads/how-to-plug-chop.53237/

in that order /\
Click to expand...
Ok thanks I have the fmf pipe and don’t have the stock oil injection I mix the the gas 32 to 1 and stock air box, I’m in Nebraska
 
OK I’ll mix it 40:1 next time there was an exaust leak right where the exaust meets the motor so fixed that and put the new reeds in and it got most of the midrange power back still has a little studder to it at midrange but not bad gonna do jets on Thursday
 
NO!! Stick with current mix , that’s what you’re jetted for !
When you clean the carb pull main jet holder/emulsion tube. There are tiny holes on the side of it. Check pilot jet that you can see through it.
 
Larry's Shee said:
NO!! Stick with current mix , that’s what you’re jetted for !
When you clean the carb pull main jet holder/emulsion tube. There are tiny holes on the side of it. Check pilot jet that you can see through it.
Click to expand...
LISTEN to Larry... seriously, all hole must be clear!!
 
Larry's Shee said:
NO!! Stick with current mix , that’s what you’re jetted for !
When you clean the carb pull main jet holder/emulsion tube. There are tiny holes on the side of it. Check pilot jet that you can see through it.
Click to expand...
Ok thankyou, I am going to jet it tonight because it is running rich so I’m going to put a smaller jet in it what would be a good size to start at?
 
Have you done a plug chop?
Or at least a accurate “read” ?
(Only difference being you don’t cut the threads off)
What main jet is in it?
Needle position?

Your original description sounds like a mid-range bog
 
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Larry's Shee said:
Have you done a plug chop?
Or at least a accurate “read” ?
(Only difference being you don’t cut the threads off)
What main jet is in it?
Needle position?

Your original description sounds like a mid-range bog
Click to expand...
Yes it is a mid range bog I am going to take the main jet out and see what is in it now and I’ll figure out what the needle position is
 
Ok so I looked at the old jet and it is a 220 my jetting kit came with a 210 220 350 360 for jet sizes where should I start?
 
Cory2000 said:
Ok so I looked at the old jet and it is a 220 my jetting kit came with a 210 220 350 360 for jet sizes where should I start?
Click to expand...

you should start by returning that jet kit, they contain the jets they cannot sale to anyone else, because they are not needed.
230 main jet is stock
270 thru 310 mains for FMF pipes, start large and plug chop down
 
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Reactions: Tankbuster and Cory2000
Awk08 said:
1. float height ...
https://www.blasterforum.com/threads/float-heights-and-how-to-adjust-them.50565/

2. tune air screw for highest idle ...
https://www.blasterforum.com/threads/adjusting-your-airscrew-pilot-jet.51060/

3. needle clip in middle position < this is what meters 1/4 to 3/4 throttle, (where your bog is)

4. 270 thru 310 mains for FMF pipes depending on elevation, temps, airbox lid/aftermarket filter, and fuel/oil mix or stock injection ?
plug chops....
https://www.blasterforum.com/threads/how-to-plug-chop.53237/

in that order /\
Click to expand...
Where do you buy your jets from?
 
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