dbw - dirtbikeworld.net Members Forums

Go Back   dbw - dirtbikeworld.net Members Forums > The Workshop > Tech Talk

Tech Talk Proudly Sponsored by Mainjet Motorcycles

Reply
 
Thread Tools Display Modes
  #1  
Old 07-06-2017
arthurf arthurf is offline
DBW Dweller
 
Join Date: May 2017
Location: Tyabb, Victoria, Australia
Posts: 7
Pilot Jet for Yamaha TTR90

G'day All, My grandson has a 2004 TTR90, and we are having a problem right now - the carburettor insists on flooding (no matter what I have tried).
So rebuild kit needed I guess.
However when I had the carb apart, and was cleaning out all the bits, I had to wonder about the Pilot Jet (it's the longer, thinner one). There is no hole right thru from top to bottom - is that correct and normal?
The carb is a standard mikuni.
Cheers, Arthur
Reply With Quote
  #2  
Old 07-06-2017
itsstock itsstock is offline
dbw Pro
 
Join Date: Nov 2012
Posts: 420
Mikuni VM28 or 486(google it for a pic)?,yes it should have a very small hole through the middle of it. Blast it with compressed Air then hold it up to a light maybe get the grandson too see if he can see a hole through it(better eye sight).
Pretty sure it's a 12.5 size jet and I think that's the smallest they make.
Reply With Quote
  #3  
Old 11-01-2018
andrewktm450's Avatar
andrewktm450 andrewktm450 is offline
dbw Factory Pro
 
Join Date: Apr 2005
Location: Illawarra
Posts: 723
Youíre right about there should be a hole down the centre of the 12.5 jet. Iíve just been working on one where the hole was blocked solid. To fix, I heated up the jet on the gas stove, dunked it in water & used a bristle from a wire brush to ensure it was clear. Bike idled perfectly after that little mod.
Question: why are the jets $7 on the net, yet $30 from a Yamaha dealer? That 4 fold difference isnít sustainable, even if they were in stock.
__________________
Le courage, c'est l'art d'avoir peur sans que cela paraisse.
Courage is the art of being frightened and not showing it.

AndrewKTM450
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
PW80 or TTR90?? Stirlo General Bike Related Discussion 9 28-02-2013 10:26 PM
PW80 or TTR90?? Stirlo Minibike Tech 0 27-02-2013 03:19 PM
TTR90 Wanted tjc4479 Kids Chat 0 08-10-2011 02:21 AM
just got another one for the wee man ! ttr90 (jianshe) rabskyline General Bike Related Discussion 24 28-01-2010 06:33 PM
XR70 vs TTR90 PageyXR General Bike Related Discussion 2 22-08-2005 11:08 PM


All times are GMT +11. The time now is 05:58 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.