Added reply in a thread 2 stoke mod for massive power increase !? 4/29/2020 12:56 AM

https://thumpertalk.com/forums/topic/179211-anyone-know-anything-about-this-thing/

Added reply in a thread 2 stoke mod for massive power increase !? 4/29/2020 12:18 AM

https://www.snowest.com/forum/threads/pulse-induction-explanation.371871/

Added reply in a thread 2 stoke mod for massive power increase !? 4/29/2020 12:08 AM

i think I found it.....pulse charge system...invented by eric gorr google is failing me now

Added reply in a thread 2 stoke mod for massive power increase !? 4/28/2020 11:57 PM

close...but not it....the 490 in my pic had a boost bottle

smile
Yammi used boost bottles for many yrs on many bikes this setup was a little more complicated i wanna say it drew air from before the reed block and went by hoses after the reed block ... more »
Started new thread 2 stoke mod for massive power increase !? 4/28/2020 10:18 PM

ok old timers....I remember a mod that could be done to the reed and intake mouth involving hoses ( from the carb or? ) like a reed spacer or something....and I remember a guy sold a kit for it on ebay and I remember it worked so well that people said ... more »

This forum thread has 6 replies

Added reply in a thread What is the best way to fix this? 4/28/2020 9:29 PM

as long as it is not in the bore...a welder can fill it up ...watching the heat...file down ...sand...and your good

Added reply in a thread Showa twin chamber, big improvement, no cost. 4/28/2020 9:26 PM

I know this is a old post.... but ....did you remove the oil lock collar ....or grind it on the rod how much did you grind it ? ....flush with rod ???

Added reply in a thread Rear wheel axle washer plates needed 4/13/2016 4:06 PM

speed n sport lists 1....call to see if it is a correct inventory

Added reply in a thread YZ125 1979 Race build 4/3/2016 4:22 PM

if you do ever remove the stock ancient seal head stack...........you will wonder how the hell did it even work !!! replace it and dont ask anymore questions

Added reply in a thread 175 Fixer upper 4/3/2016 2:16 PM

the old mx175....based on the 78 DT 175.....great little motors ......not much on suspension....plenty of parts since yammi kept this engine going on world wide models for many yrs a mod i did on mine was to free flow the air box and enlarge the ports ... more »

Added reply in a thread YZ125 1979 Race build 4/3/2016 2:06 PM

there 2 ways to get past the double clipped seal heads.....press to expose the first clip.....or grinding with a tool on the seal head ( read dremel ) to expose the clip enough to get to it and pull it out with a pair of pliers.......if you ask race ... more »

Added reply in a thread 1985 YZ 125-N Rebuild 3/29/2016 11:32 PM

the shock on that yr has the dreaded double clipped seal head....you can get it out with enough perseverance and the right technique.......the alls balls seal head has a built in bumper which is all wrong for the shock.......race tech sells the better ... more »

Added reply in a thread 89 YZ490 Rebuild 3/29/2016 11:19 PM

the PC pipe I have for my 86 490 does NOT fit my 92 wr500.......the stinger is at a different angle and will not work.....my .02

Added reply in a thread 74-78 CR125 520 conversion front sprocket? Lightweight project. 4/28/2015 11:42 AM

what ever happened to Krause racing? he had tons of stuff for all kinds of bikes

Added reply in a thread Yz 250 synthetic trans oil 4/2/2015 2:20 PM

i looked and dont see any claims the redline is wet clutch compatible...........is it ?

Added reply in a thread 87 kx250 fork oil? 4/2/2015 8:46 AM

race techs site suggests 125mm

Added reply in a thread 1990 YZ490 ?? 2/7/2015 8:27 PM

VMX has digital copys you can buy online as opposed to buying back issues and paying an arm and a leg for shipping from OZ.......so i bought a digital copy that has the article about that 83 yz490 ....they raved about the Pro-form pipe that was custom ... more »

Added reply in a thread 1990 YZ490 ?? 12/2/2014 9:19 PM

you used the 490 master cylinder instead of the 500 MC ?

Added reply in a thread 1990 YZ490 ?? 11/21/2014 10:25 PM

anybody got a copy of that VMX article?

Added reply in a thread 1990 YZ490 ?? 11/21/2014 11:28 AM

LOL.......a shifter that created more problems than it solved?? guess its a yz 250 shift lever for me ! will that devol linkage fit a wr500? is it still availible?