Jump to content
Sign in to follow this  

2007 yz 85 question

Recommended Posts

my neighbors son has a yz 85 but he uses it only for like trail riding and he is kinda new with clutch use; so the question is how can I tune the bike so it can be rideable in low speed, so it wont die when its just coming out in first gear if u dont rev it much, what jets do I use cuz I heard a guy say that the 85's can be tuned to be low rev'd by changing jets is this true???

Share this post


Link to post
Share on other sites

Low end power can be enhanced with perfect jetting, BUT the real problem here is the poor kid has been given the wrong bike to ride. He needs a TT-R125.

Share this post


Link to post
Share on other sites

maybe a aftermarket pipe and some reeds may give it a bit better low end

but skill comes with practise and he will probably get the clutch mastered in a couple of rides

a crf 150r would have way more bottom end than a 85 marbe thats a better bike for him

if you can find a ttr 125 or crf 80 that he can practise on to use the clutch then that would help him alot

Share this post


Link to post
Share on other sites

the 4 strokes are so much more forgiving but all will be better with practice. You could try a smaller sproket in the back, but that will also increase the power and shorten 1st gear.

Share this post


Link to post
Share on other sites

Yeah I know thats what I told my neighbour but he just wont listen, but Ill try the pipe and reeds to se what happens a friend of mine told me to put weight on the flywheel but the thing is in this country you cannot find anything for 85's so how many grms or pounds are we talking about

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

  • Similar Content

    • By SNORE125
      Anyone else have 130 main and 38 pilot jets already in the carb I took the wifes ttr 230 carb apart to add the bigger jets and this bike from 05 that I bought new already had them in it? I was reading that they came with a 125 main and a 36 pilot.
    • By Charles Joseph Miron
      Hello all.  Need a helping hand here..  
      I bought an older TT225 and am not about to spend almost $600 on a new carburetor for it. So I'm hoping someone can help me out with an idea of what (other than original carburetor) style, type and brand I should go with..  I'm also having a bit of trouble finding info on this bike.  It's a 1986 Yamaha TT225.  
      Thank you in advanced
      Charles
    • By Br0ck
      Hey guys, I went on vacation all summer and let my bike sit (2002 CR250). When I got back I ripped it apart and cleaned carburetor and put it back together and it started fine and ran alright, but idled really high. I adjusted the idle screw and realized it was a ridiculous amount of turns out. I can't remember exactly how many but id say 6+ turns out. My killswitch was a POS and didn't work anymore so I replaced it with an oem replacement. My last ride I crashed the bike pretty bad and I was off the bike for 2 weeks. I can't get the bike to start ever since I got installed the new killswitch. I think I wired it right I just replaced one wire at a time and it looked pretty straight forward. I verified it by testing spark while holding it in I was getting no spark but with it in running position it would spark. 
      Anyway I am just looking for some base settings for the Mikuni TMX to get my bike running again, my carburetor has a 35 Pilot and 380 Main jet which appear to be stock. I am located in Edmonton, AB, Canada which is about 2500ft and usually ride between 10-25 celcius.
      Thanks for any replies. 
    • By Goon Rides
      Hey guys... so I have a problem... I took the bike at Cal City, broke it in, and while I was doing so, the bike was bogging in first gear (Yes, first gear). Also it doesn't idle at all. I have to keep blipping it otherwise it'll stall. So I adjusted the screw circled in image 1. Well I was listening to the sound of the of the bike, yet the rpm's weren't increasing, and it was still stalling. So then, I unscrewed the screw in image 2, well I found out that it was fully twisted to the right. So then, I twisted it to the left, still nothing; it was still stalling... where's the idle screw? I am sure that the screw in image 1 is for the air/fuel mixture screw, and the screw in image 2 is the idle screw, just broken? I don't know, any and every help would be appreciated.


    • By Zach7018
      So Ive decided its time to pull apart my favorite machine and freshen it up, and I'm looking to make some improvements in the process. I already have a 3x3 mod and a JD jet kit done and it seemed to have changed the world. The stock bike just plain sucked and now its a lot better. I never expect 450 race bike power here but I know there is a little more and I'm wondering if the juice is worth the squeeze. I already plan to add a header and exhaust, an FCR39 carb and stage 1 hotcams. After some research it really seems like those places are where the gains actually come from, so would it be worth it to throw a 434 big bore kit at this bike or just stick with what I already mentioned and a new stock bore top end??? Also my rides are often solo and pretty isolated,how much of a reliability headache can I expect with these mods? 
×