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Fueling & shaft drive

Alien1200

Alien1200

New Member
Joined
Sep 22, 2020
Messages
20
Location
UK
Hi,

Only had XT about 4 weeks and have a couple of questions.

1, Is anyone aware of any fueling issues between 2500 - 4000rpm? When riding in lowers gears in town on steady throttle the rpm suddenly drops for second or so before jumping back up again. Feels like the fuel or ignition has cut out. There are no warning lights on dash, happens in both modes. I have read it maybe throttle bodies need balanced, but not sure. Also on cold starting it idles very roughly almost stalling and there is sometimes a strong smell of petrol!

2. With bike on centre stand, engine off and in 1st gear, how much movement should there be at rear wheel.

Thanks in advance for any advice.

Allen.
 
jrusell

jrusell

Well-Known Member
Joined
Aug 23, 2017
Messages
460
Location
Dartmouth, Nova Scotia, Canada
Alien1200 said:
Hi,

Only had XT about 4 weeks and have a couple of questions.

1, Is anyone aware of any fueling issues between 2500 - 4000rpm? When riding in lowers gears in town on steady throttle the rpm suddenly drops for second or so before jumping back up again. Feels like the fuel or ignition has cut out. There are no warning lights on dash, happens in both modes. I have read it maybe throttle bodies need balanced, but not sure. Also on cold starting it idles very roughly almost stalling and there is sometimes a strong smell of petrol!

2. With bike on centre stand, engine off and in 1st gear, how much movement should there be at rear wheel.

Thanks in advance for any advice.

Allen.
Click to expand...
Your rear wheel will rock back and forth approx an inch or so. Completely normal. Here is a link to a short clip.
 
C

Cycledude

Well-Known Member
Joined
Jan 29, 2016
Messages
4,030
Location
Rib lake wi
Sounds like you might be from a different country than the USA with different registration methods.
If you show us a picture of the dash gauges we should be able to tell if it’s a generation one or two.
Your fueling issue is very common, my generation one had the issue and my generation two has it even worse, many folks claim having the computer custom flashed usually makes the problem disappear, hard to believe Yamaha keeps sending bikes out like that. My generation two averages about 8 mpg better than the generation one did.
Alien1200 said:
It's registered 2016, but think it a 2013/14 model (23P)
Click to expand...
 
Last edited:
Alien1200

Alien1200

New Member
Joined
Sep 22, 2020
Messages
20
Location
UK
Cycledude said:
Sounds like you might be from a different country than the USA with different registration methods.
If you show us a picture of the dash gauges we should be able to tell if it’s a generation one or two.
Your fueling issue is very common, my generation one had the issue and my generation two has it even worse, many folks claim having the computer custom flashed usually makes the problem disappear, hard to believe Yamaha keeps sending bikes out like that. My generation two averages about 8 mpg better than the generation one did.
Click to expand...
Oops should said it a Gen 1
 
WJBertrand

WJBertrand

Ventura Highway
Joined
Jun 20, 2015
Messages
4,532
Location
Ventura, CA
If you are in gear when you notice the fueling issue, I don’t understand how the RPMs could drop without also having the speed drop too?? When in gear there is a fixed ratio between the crankshaft speed and rear wheel speed.


Sent from my iPhone using Tapatalk Pro
 
Alien1200

Alien1200

New Member
Joined
Sep 22, 2020
Messages
20
Location
UK
WJBertrand said:
If you are in gear when you notice the fueling issue, I don’t understand how the RPMs could drop without also having the speed drop too?? When in gear there is a fixed ratio between the crankshaft speed and rear wheel speed.


Sent from my iPhone using Tapatalk Pro
Click to expand...
Yes the speed does drop.
 
jrusell

jrusell

Well-Known Member
Joined
Aug 23, 2017
Messages
460
Location
Dartmouth, Nova Scotia, Canada
The rough idle would make me lean towards doing a throttle body balance. It shouldn't affect between 2-4000rpm, but start with he simple things first and see if it also cures that problem.
Throttle opening is very small at low rpm so hopefully it fixes both issues.
 
Alien1200

Alien1200

New Member
Joined
Sep 22, 2020
Messages
20
Location
UK
Problem solved, turned out need new spark plugs. It would appear they were never changed from new.
When I purchase the bike it had 11,800 miles. Service book stamped at 10,500 miles and states 'engine oil, oil filter, final drive oil, air filter, spark plugs changed and throttle body balanced.
Moral of the story never trust service book. On the upside dealer I brought it from has now done all of the above foc. Now running a lot smoother :)
 
Cantab

Cantab

Well-Known Member
Joined
Mar 15, 2020
Messages
483
Location
Christchurch NZ
Alien1200 said:
Problem solved, turned out need new spark plugs. It would appear they were never changed from new.
When I purchase the bike it had 11,800 miles. Service book stamped at 10,500 miles and states 'engine oil, oil filter, final drive oil, air filter, spark plugs changed and throttle body balanced.
Moral of the story never trust service book. On the upside dealer I brought it from has now done all of the above foc. Now running a lot smoother :)
Click to expand...
Great result !
 
staq50

staq50

Member
Joined
Oct 13, 2019
Messages
72
Location
Hawkes Bay, New Zealand
Alien1200 said:
Problem solved, turned out need new spark plugs. It would appear they were never changed from new.
When I purchase the bike it had 11,800 miles. Service book stamped at 10,500 miles and states 'engine oil, oil filter, final drive oil, air filter, spark plugs changed and throttle body balanced.
Moral of the story never trust service book. On the upside dealer I brought it from has now done all of the above foc. Now running a lot smoother :)
Click to expand...
good fix, but check the throttle body sinc. anyway, and also probably have the fuel filter cleaned or replaced....
 
Alien1200

Alien1200

New Member
Joined
Sep 22, 2020
Messages
20
Location
UK
Well that didn't last long. Went for first long run yesterday, about 20 mile in bike started playing up again. Back to dealers, new spark plugs already black in few hundred miles. Appear to be over fuelling. Dealer is sending bike to main Yamaha dealer for full diagnostic of fuel system. Opinion at this stage is faulty TPS :confused:
 
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