A forum for owners of Yamaha TTR250 trail and enduro bikes!

Members Login
Post Info TOPIC: High Idle when RIDING.
z1g


Veteran Member

Status: Offline
Posts: 60
Date:
High Idle when RIDING.
Permalink  
 


Hi Guys,

I thought i had my idle screw set right.

When cold, fires up straight away, ocasonially use choke for a couple seconds. Idles fine, sounds fine not revving hard.

Noticed tonight when i went for a ride, that coming into intersections/round abouts. Anytime i pulled the clutch in it seemed to be over revving?

It was red hot when i got home, switched it off, waited for 1 min, then fired it back up IT was idling high so and adjusted idle screw to a more reasonable reving sound.???? 

Is this normal, the hotter it gets, the higher it revs.

I ask, as when it was hot, i retarded the idle screw heaps, more than i expected to have to do. Suprized me how far in i turned it.

Cheers

Z

Got her up to 80 km tonight and felt fine.(look out guiness book of world records) :) Front brakes are amazing. #loveit 

 

 Edit: thread title to reflect problem. High idle when/during riding.





-- Edited by z1g on Tuesday 22nd of May 2018 11:13:51 AM

__________________
  __    __          
_/  |__/  |________ 
\   __\   __\_  __ \
 |  |  |  |  |  | \/
 |__|  |__|  |__|   
                    


Member

Status: Offline
Posts: 17
Date:
RE: High Idle when warm.
Permalink  
 


The exhaust was literally red hot?



__________________


Super Guru

Status: Offline
Posts: 1631
Date:
Permalink  
 

Should not rev higher when hotter like you are describing.



__________________

totallyttrs.com

 

z1g


Veteran Member

Status: Offline
Posts: 60
Date:
Permalink  
 

Ether wrote:

The exhaust was literally red hot?


 Yeah header??? Pipe glows.



__________________
  __    __          
_/  |__/  |________ 
\   __\   __\_  __ \
 |  |  |  |  |  | \/
 |__|  |__|  |__|   
                    
z1g


Veteran Member

Status: Offline
Posts: 60
Date:
Permalink  
 

ttr steve wrote:

Should not rev higher when hotter like you are describing.


 Will take it for another ride after adjusting idle screw from a HOT ride. See what happens. Thanks steve. Was weird, coming into intersection, pulling the clutch in, and hearing bike rev up.... not sure what's happening.

I noticed it on that ride, but more importantly, when i pulled up @ home, and had to open garage to ride in. It seemed to go from normal revs.... to way over revving. Ride it in.... then see above.

I have fiddled with the idle screw from factory setting, so most likely me just stuffing it up. The only thing i have done, was when firing it up COLD, i adjusted it to run at a normal slow idle. Appeared to not idle when cold no choke. I must have turned it in last night about 3+ time clockwise





-- Edited by z1g on Tuesday 15th of May 2018 12:21:16 PM

__________________
  __    __          
_/  |__/  |________ 
\   __\   __\_  __ \
 |  |  |  |  |  | \/
 |__|  |__|  |__|   
                    
z1g


Veteran Member

Status: Offline
Posts: 60
Date:
Permalink  
 

Look i'm sorry, but i'm still having an issue with this.
Fired bike up in shed (cold). Idle screw adjusted low. Revs low..
Took it for a quick squirt around the block 500meters+. Pull up at shed.... idles high..
I am confused as to why it idles low on start, i let it warm up for a couple of minutes....
Then 3-5 minutes later. Idles high without touching anything.
I might just set idle screw back to factory settings.
Z
Thinking maybe it's the throttle cable??? Will wd40 it and see. So strange.



-- Edited by z1g on Friday 18th of May 2018 02:22:54 PM

__________________
  __    __          
_/  |__/  |________ 
\   __\   __\_  __ \
 |  |  |  |  |  | \/
 |__|  |__|  |__|   
                    


Super Guru

Status: Offline
Posts: 7015
Date:
Permalink  
 

Anything in this thread of help?



__________________

Exeter, Devon, UK

http://www.ttr250.com  - The one and only dedicated TTR250 FAQ! 
 

TIP: For easy viewing bookmark the "Recent Posts" view - http://ttr250.activeboard.com/p/recent/ 

z1g


Veteran Member

Status: Offline
Posts: 60
Date:
Permalink  
 

Thanks ttrfan, checking it out.
Just adding a pic of it warming up, after 1-2 minutes. Lights off to see the glow.
Cheers

Because i a new, just wondering out loud, if this is normal.please excuse my ignorance.

Just to be clear, this is ideling at a low rev, (started with choke out for 3 seconds then choke in) idleing for about 2 minutes. Have not ridden it since last post. But that look super hot to me.


-- Edited by z1g on Saturday 19th of May 2018 12:34:45 PM

2nd edit: took it for a ride, idles are XYZ revs say 500 just for a number, 1 minute of riding, pull in clutch, revs at 1500. (Don't have a tacho to tell, just by ear).

It's higher. Feels like 4k when pulling clutch in, to go through intersections.?????? Way,way  higher than idle.

 



-- Edited by z1g on Saturday 19th of May 2018 01:41:39 PM



-- Edited by z1g on Saturday 19th of May 2018 01:46:24 PM

Attachments
__________________
  __    __          
_/  |__/  |________ 
\   __\   __\_  __ \
 |  |  |  |  |  | \/
 |__|  |__|  |__|   
                    


Veteran Member

Status: Offline
Posts: 48
Date:
Permalink  
 

Looks really hot to me!! "Just to be clear, this is idling at a low rev, (started with choke out for 3 seconds then choke in) idling for about 2 minutes.".

Did you rev it at all, and then went to fast idle??

If so, remove throttle cable, to see if it is sticking, and rev up on carb linkage. You may have already tried this?
Mike



__________________


Veteran Member

Status: Offline
Posts: 48
Date:
Permalink  
 

Just came across this, so may not be too hot after all. https://www.xt660.com/showthread.php?p=211566

 

 

hot1.jpg



__________________
Moo


Senior Member

Status: Offline
Posts: 337
Date:
Permalink  
 

Ive never had a red glowing pipe on either of my TTR's.

You sure the mixtures right? and its not running too hot/lean. Is your carb secure with no leaks?

__________________

Malcolm, Northamptonshire. West Anglia TRF

1996 TTR 250 Raid

2005 TTR 250 Bluey

pug


Senior Member

Status: Offline
Posts: 494
Date:
Permalink  
 

Something is not right mix wise that pipe should never get that hot on tick over maybe at full thrash after 10 minutes you might get a bit of colour to it if you stop and look quick in the dark. I would go with the mix being to lean as the problem so its under fuelled or a air leak as has been said. I have some pics hear somewhere of my old Gpz Drag Bike with the headers red/yellow and the pipe from the collector back to the can covered in Ice when we had it on a rolling road one time with 175Bhp of Nitrous oxide pushing the motor past the 300 Bhp mark will see if I can find them and post them up

Pug

__________________
z1g


Veteran Member

Status: Offline
Posts: 60
Date:
Permalink  
 

Hi guys,
Thanks for the replies.
TO BE CLEAR : that pic was taken after about 2 minutes of low revs.
When i did a carby clean, i just put jets back in the way it come out. Example... one jet was screwed all the way in, so i screwed it back in all the way.
Carbs, are something i have never really dealt with. And have ZERO knowledge about!!!

I need to do more research, aka ttrfan's link.

I can tell you that it will idle at low revs forever. But once i take out for a ride with in 1 minute, 300 meters (first intersection) i pull clutch in, and it revs way way higher.

i have an clicker shed/garage, so if you can imagine riding for say 1 km... then pulling up at shed door, leaving it in netural, and then hitting the garage door button to open to ride in, it's reving hard, way harder than idle.

I'll try and find the problem, as best i can, and report back. I feel its not right. Might record the sound just so you blokes can hear it, might make sense then.
z.



-- Edited by z1g on Sunday 20th of May 2018 12:24:33 PM

__________________
  __    __          
_/  |__/  |________ 
\   __\   __\_  __ \
 |  |  |  |  |  | \/
 |__|  |__|  |__|   
                    
z1g


Veteran Member

Status: Offline
Posts: 60
Date:
Permalink  
 

How do i check for carb leaks???
Or fuel mixture.

I think i'll take a wd40 the throttle cable first??? Feels like the throttle rolls on and off as it should...but obs something is not right
Sorry to be a knob.



-- Edited by z1g on Sunday 20th of May 2018 12:36:10 PM

__________________
  __    __          
_/  |__/  |________ 
\   __\   __\_  __ \
 |  |  |  |  |  | \/
 |__|  |__|  |__|   
                    
pug


Senior Member

Status: Offline
Posts: 494
Date:
Permalink  
 

when you have that WD40 out Spray some of it round round the rubber intake manfold when running and see if the rev's drop that will point to a air leak

__________________
z1g


Veteran Member

Status: Offline
Posts: 60
Date:
Permalink  
 

cheers pug,

heres what it sounds like from my end.
I try and fire it up NO choke.
then I put choke on, for about 3 seconds? it revs higher,
turn choke off,
and it now revs at a normal speed.

if it sounds different, thats because I was recording the exhaust, and the engine. so walking around it.

ttr250 startuo (29seconds)

vocaroo.com/i/s0ov88g6D1o3

__________________
  __    __          
_/  |__/  |________ 
\   __\   __\_  __ \
 |  |  |  |  |  | \/
 |__|  |__|  |__|   
                    


Veteran Member

Status: Offline
Posts: 48
Date:
Permalink  
 

It is supposed to rev higher whilst choke is out.
Mike

__________________


Veteran Member

Status: Offline
Posts: 48
Date:
Permalink  
 

What about when you rev bike stationary, does it return to idle then? Cannot hear vocaroo.
mike



__________________


Veteran Member

Status: Offline
Posts: 48
Date:
Permalink  
 

Have you tried slackening the throttle cable off on the linkage above the choke, or revving from there as the cable may be too tight or jamming. could be that the cable needs re routing slightly as it is pulling on full lock as you are riding from garage??
Mike

__________________
z1g


Veteran Member

Status: Offline
Posts: 60
Date:
Permalink  
 

Micccki,
When i pulled carb off, i did have some trouble putting it back on, re:linkages i don't feel they (2) cables were set back to original settings.
Takes a while for sound clip to load, give it 30 seconds. Working my end.....(on tablet device)
Now that it's been mentioned, when choke is on, seems to over rev (after listening to it) more than what it should. Sometimes i do not have to use choke.??? Tonight is cold, so.....
i prob stuffed up something after doing a clean on carb.
all ears.
will be trying all suggestions.
thank you

Z

Does the audio clip work for others??? Cold start.



-- Edited by z1g on Sunday 20th of May 2018 02:33:16 PM

__________________
  __    __          
_/  |__/  |________ 
\   __\   __\_  __ \
 |  |  |  |  |  | \/
 |__|  |__|  |__|   
                    


Veteran Member

Status: Offline
Posts: 48
Date:
Permalink  
 

Cables can be a pain. if it is not too much trouble for you, i would take the tank off and remove cables completely then refit tank and start bike, revving it from the linkage to see if it returns to idle. I always need choke on mine.
Mike

__________________


Veteran Member

Status: Offline
Posts: 48
Date:
Permalink  
 

Heard it now. sounds ok to me.

__________________


Member

Status: Offline
Posts: 17
Date:
Permalink  
 

That glowing is a bad sign after just 2 minutes. Can you get temps for the exhaust when it's red hot? Have you checked valve clearances? Also what does the spark plug look like?

If it were mine i'd change the intake manifold in case it's leaking. They're not expensive. Mine was leaking but it has the old ****ty manifold which your bike probably doesn't. 



-- Edited by Ether on Sunday 20th of May 2018 07:04:18 PM

__________________
z1g


Veteran Member

Status: Offline
Posts: 60
Date:
Permalink  
 

Ether wrote:

That glowing is a bad sign after just 2 minutes. Can you get temps for the exhaust when it's red hot? Have you checked valve clearances? Also what does the spark plug look like?

If it were mine i'd change the intake manifold in case it's leaking. They're not expensive. Mine was leaking but it has the old ****ty manifold which your bike probably doesn't. 



-- Edited by Ether on Sunday 20th of May 2018 07:04:18 PM


I'll buy a temp gun, as its a bit of kit i think i should have. Plus cheap enough to have.

Brand new plug put in, can pull it out and check. No never looked at anything engine wise. Has less than 5k on clock since 2005 (if you believe the story, which currently i do, but i'm somewhat of a trusting person).

Seems to run fine, just buggered why it over revs after a short squirt, never over revs when just idling.

Bit busy this week, but will start to test things this weekend as others have suggested.

Again many thanks for all opinions.

First air cooled bike i have owned since the mid 80's :) so no experince with them really. I just noticed how hot it looked and wondered if that was normal. Seems like it's not.

Yeah i would back myself up and say, it became that hot after a couple-3 minutes, may have given it a rev or two (don't remember to be honest). But was not ridden when pic was taken.

Have not ridden it since last post, but i have listened to my audio clip a few times. I'd say that when i ride for 1km and pull up at my garage, it rev's like it does in the audio clip (when choke is put on) aka high. SO TO ME it seems like after a ride, it revs (high) like the choke is on?? 7sec mark in audio clip

Audio clip

Key is on

Fuel is on. 

2-5 seconds first click is red button on bars

Then hit starter button, does not fire up

5 seconds 2nd click is the choke being swithed on, and hit the starter again, 10 seconds when the revs die, choke has been switched off.

 



-- Edited by z1g on Monday 21st of May 2018 01:04:13 PM

__________________
  __    __          
_/  |__/  |________ 
\   __\   __\_  __ \
 |  |  |  |  |  | \/
 |__|  |__|  |__|   
                    


Member

Status: Offline
Posts: 17
Date:
RE: High Idle when RIDING.
Permalink  
 


Just for comparison, i measured the pipe temp on mine after 20 minutes riding around. It got to 230c. 



__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard