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

Members Login
Username 
 
Password 
    Remember Me  
The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Question about idling
Post Info TOPIC: Question about idling
yamahaTT250R


Veteran Member

Status: Offline
Posts: 50
Date:
Question about idling
Permalink  
 

Ever since i bought My ttr it bogs when i blip the throttle when its in neutral, Does anyone else have this problem?

it doesnt seem to matter when im riding as it doesnt seem to do it only when at a standstill.

Also my bike is a 2000 Australian ttr with #147 main jet and #50 pilot jet with the original exhaust on and my spark plug always seems to be blackend when i replace it any ideas?

thanks



-- Edited by yamahaTT250R on Wednesday 15th of August 2012 05:22:00 AM



-- Edited by yamahaTT250R on Wednesday 15th of August 2012 05:22:17 AM

__________________
barra8


Guru

Status: Offline
Posts: 932
Date:
Permalink  
 

 

Depending whether the spark plug is oily or not a black spark plug can mean it's running rich eg. (main jet # too big for set up) or worn rings or valve stem seals =blowing smoke=black spark plug??

 

If it's not blowing smoke on start up (while cold)or while running a black plug can mean you are running rich (ie main jet too big)but i don't see how that can be if using #147mm unless your air filter is blocked or or old

Note: White crust on spark plug means running lean

Steps to do

  • Clean pilot jet, main jet and carby spotless also making sure you clean the needle and seat (float needle)

 

  • Blow all holes out with an air compressor

 

  • Does'nt help?=drop the carby pin down one on the circlip holding the pin inside top of carby

 

  • Still does'nt help go up to #148mm main jet

 

  • If still not as desired go #150mm main jet and fit an aftermarket air filter eg K&N or similar and Fmf Q4 or similar

 

#50 mm pilot jet should be ok to use with any main jet mentioned as i'm using #150mm main jet + #50mm pilot jet and goes really well since i did the change from #147mm to #150mm main jet with an aftermarket air filter and trimmed the snorkel (air box duct)down a bit...Yet to get an fmf Q4 but run an xt 500 exhuast atm.

 

Note: YAMAHA made some models a small pethetic main jet eg.#140 -#147mm and under because of carbon emissions in some states,countries and was to do with enduro events as they had to comply with strict rules and regulations.

 

Also to make the bike more managable for the novice riders

 

and the fact that the air box is'nt exactly a high flow boxhmm

 



 

Other note: It may be hard to get a #148mm main jet as i looked on the jetting info page eg. http://ttr250.activeboard.com/t49951533/jetting-information/ and it may not be common anymore cry That is UK info though but may have to use the #147 main

 

Remember: The bigger the jet the more air flow it will need to run properly ie .#150 main jet or higher=K&N filter+FMF Q4 or similar to get the most out of the bigger jet.

 

Jarrah.

 

 

 

 



-- Edited by barra8 on Wednesday 15th of August 2012 12:42:28 PM

__________________

YAMAHA ROCKS!!!!!!

TTR250ACTIVE''BORED'' ADDICT!

Favourite quote: To be old & wise first you must be young & dumb!

My own: Your never too young to learn an old trick! :)

Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Question about idling


Create your own FREE Forum
Report Abuse 		Powered by ActiveBoard