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Old 03-11-2007, 08:35 PM   #1
explore OP
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help needed NX650 / XR650L

hi guys

i need some help with my 95 dommi, 65000ks on the clock, Ive had the bike for nearly 2 years 30000ks, i service it every 3000ks it been a great bike for reliability an has taken me on some brilliant rides but on my last two rides its developed a running problem between 3500rpm - 4500rpm it seems to hesitate, loss of power like its just going to run out of fule, but it will stay like that constantly un till you accelerate past 4500rpm, it still starts first time an ticks over perfectly Ive changed the obvious - spark plug, fule fitter an checked the electrical connections, but all seem fine, so before i start sending the electrics to be tested, an pulling the crab off for a clean has any one got any ideas of what may be causing this ? any advice would be greatly appreciated

thanks
STEVE

edit; I believe its the same engine / carb as the XR650L

explore screwed with this post 03-29-2007 at 06:40 AM
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Old 03-11-2007, 10:03 PM   #2
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Sounds like a dirty carb to me. Id also check the fuel screen in the tank petcock as well at that mileage.
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Old 03-12-2007, 12:17 AM   #3
Luke
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Check the air filter if you haven't already. Blow it out with compressed air from the inside. Mine gave me the same symptoms when it got dirty.
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Old 03-29-2007, 06:36 AM   #4
explore OP
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thanks for the advice guys,, ive pulled the carb off an cleaned it, an the screen in the tank. also the air filter,,,,,,,,,,,,,,,

BUT AAAAAGGGGGGGGGGHHHHHHHHH !!!!!!!! it still runs like crap if any one else has any ideas i would really appreciate any help or advice, because im supposed to be going on a 400k dirt ride over Easter,,,,

i believe its the same engine as the xr650l

thanks

steve
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Old 03-29-2007, 11:00 AM   #5
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If its fine except for those RPMs/throttle settings, and fine at full throttle, it does sound carb related.

When you cleaned the carb, did you pull the main jet and emulsion tube (main jet holder)?

Is the needle seat in the right place?

Is this a manual-slide carb or a CV carb?

Now, it could be a funky CDI or timing pickup, as well, but it sure sounds like a carb issue.

Dave
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Old 03-31-2007, 02:49 AM   #6
explore OP
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Quote:
Originally Posted by XR650L_Dave
If its fine except for those RPMs/throttle settings, and fine at full throttle, it does sound carb related.

When you cleaned the carb, did you pull the main jet and emulsion tube (main jet holder)?

Is the needle seat in the right place?

Is this a manual-slide carb or a CV carb?

Now, it could be a funky CDI or timing pickup, as well, but it sure sounds like a carb issue.

Dave
hi dave

the carb got a total strip an clean , jets out etc, all the holes blown out with a compressor ,,

sorry but what do you mean by, an how can you check "Is the needle seat in the right place" ?

it is a CV carb

i no it sounds like a carb problem but i don't no what else to check ,, i had a spare coil an rectifier which ive also eliminated now im rapidly running out of options

thanks for the help

steve
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Old 03-31-2007, 06:47 AM   #7
joe a
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Question Cdi ?

If you look around this forum and other NX/XR/XL/TA/AT forums you will see
a lot of folks have had issues with the older CDI units.(Including me with my 88NX).I chased what I thought was a fuel problem until I changed the CDI.
I'm not saying thats the answer,but if all else seems OK than install a new one and save the oldy for a "back-up".

joe a screwed with this post 03-31-2007 at 06:52 AM
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Old 04-02-2007, 05:20 PM   #8
XR650L_Dave
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Quote:
Originally Posted by explore
hi dave

the carb got a total strip an clean , jets out etc, all the holes blown out with a compressor ,,

sorry but what do you mean by, an how can you check "Is the needle seat in the right place" ?

it is a CV carb

i no it sounds like a carb problem but i don't no what else to check ,, i had a spare coil an rectifier which ive also eliminated now im rapidly running out of options

thanks for the help

steve
There is a small brass piece in the carb which is held in my the main-jet holder.

It is the piece the slide needle seats in. On my XRL the seat came loose when I swapped the main jet- lord only knows how the thing'd run if it were missing, or mis-seated.

Dave
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Old 04-03-2007, 06:17 AM   #9
explore OP
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Quote:
Originally Posted by awryders
If you look around this forum and other NX/XR/XL/TA/AT forums you will see
a lot of folks have had issues with the older CDI units.(Including me with my 88NX).I chased what I thought was a fuel problem until I changed the CDI.
I'm not saying that's the answer,but if all else seems OK than install a new one and save the oldy for a "back-up".
HI awryders

i just changed the CDI but its still the same, well at least ive got a spare one now !

cheers

steve
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Old 04-03-2007, 06:26 AM   #10
explore OP
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Quote:
Originally Posted by XR650L_Dave
There is a small brass piece in the carb which is held in my the main-jet holder.

It is the piece the slide needle seats in. On my XRL the seat came loose when I swapped the main jet- lord only knows how the thing'd run if it were missing, or mis-seated.

Dave
hi dave

i puled the carb out again an checked , but its fine , i did notice the needle didn't sit perfectly square in the vacuum piston ... is it supposed to be like that ? an the needle moves slightly left an right.... any other suggestions ?
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Old 04-03-2007, 10:46 AM   #11
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Quote:
Originally Posted by explore
hi dave

i puled the carb out again an checked , but its fine , i did notice the needle didn't sit perfectly square in the vacuum piston ... is it supposed to be like that ? an the needle moves slightly left an right.... any other suggestions ?
It should be pretty straight, but a little slop is OK.

Just so long as the needle is seated down in its little 'well' in the slide, and the spring-cap holds it down, that part of it sounds OK.

Odd thought- have you checked the valves? Is the cam chain worn out (making a slapping sound)?

Dave
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Old 04-03-2007, 11:01 AM   #12
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At this milage rubber on the piston of the CV slide may have hardened a little over time, I would change it and also put a new needle and a new needle jet. If the rest is ok than it should fix the problem. Have you checked your valves adjustment?

Martin
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Old 04-04-2007, 06:24 PM   #13
explore OP
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Quote:
Originally Posted by XR650L_Dave
It should be pretty straight, but a little slop is OK.

Just so long as the needle is seated down in its little 'well' in the slide, and the spring-cap holds it down, that part of it sounds OK.

Odd thought- have you checked the valves? Is the cam chain worn out (making a slapping sound)?

Dave
hi Dave

i checked the valves at the last service (but i will check again) an there's no abnormal sounds coming from the engine
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Old 04-04-2007, 06:31 PM   #14
explore OP
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Quote:
Originally Posted by MartinDKtm
At this milage rubber on the piston of the CV slide may have hardened a little over time, I would change it and also put a new needle and a new needle jet. If the rest is ok than it should fix the problem. Have you checked your valves adjustment?

Martin
hi martin

the diaphragm rubber is fine ive checked an rechecked , ive got a new needle an needle jet on order an is should be hear to day ill re port back later

thanks for the advice everone


STEVE
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Old 04-04-2007, 06:34 PM   #15
rmhrc628
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Quote:
Originally Posted by explore
hi guys

i need some help with my 95 dommi, 65000ks on the clock, Ive had the bike for nearly 2 years 30000ks, i service it every 3000ks it been a great bike for reliability an has taken me on some brilliant rides but on my last two rides its developed a running problem between 3500rpm - 4500rpm it seems to hesitate, loss of power like its just going to run out of fule, but it will stay like that constantly un till you accelerate past 4500rpm, it still starts first time an ticks over perfectly Ive changed the obvious - spark plug, fule fitter an checked the electrical connections, but all seem fine, so before i start sending the electrics to be tested, an pulling the crab off for a clean has any one got any ideas of what may be causing this ? any advice would be greatly appreciated

thanks
STEVE

edit; I believe its the same engine / carb as the XR650L
Steve yes same as a 650L

I strongly suggest the CDI is replaced - this was an issue with the 650L and will be with yours.
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