How much compression should my 250 2 stroke have?
A 250cc 2 stroke should have 170 PSI or more and 210 PSI when new. A 500cc 2 stroke should have at least 140 PSI of compression and 170 PSI for good performance.
What makes a Yamaha yz250e so weak?
Weak down low but comes on hard mid to top. Definitely want to keep it on the pipe. Seemed like a lot of work to ride it hard but then again I did get lazy riding four strokes for so long.” The bars are removed and bolts saved in place. Zip – just cut the fork boots off. #“Someone on this board also recommended a reed spacer to help the low end.
What was the new motor for the YZ250?
The big news on the ’95 YZ250 was its majorly revamped motor. After over a decade of use, Yamaha did away with their YPVS (Yamaha Power Valve System) and replaced it with an all-new design.
When did the YZ250 lose out to the CR250R?
After taking MXA shootout victories in ’91 and ’92, the YZ250 lost out to the rocket fast, but poorly suspended CR250R in ‘93. Then in ’94, it was the incredibly plush Kawasaki KX250 that beat out the YZ for the class title. For ’95, Yamaha would look to build on the strength of its proven design, to reclaim the title of the top 250 in motocross.
Can a 1978 Yamaha YZ 250 be replaced?
Here are some facts and figures that we were able to glean about the 1978YZ 250. The rear fender will have to be replaced. The saddle cover was fine and the base had no cracks. The bolts were put back into place after removal.
After taking MXA shootout victories in ’91 and ’92, the YZ250 lost out to the rocket fast, but poorly suspended CR250R in ‘93. Then in ’94, it was the incredibly plush Kawasaki KX250 that beat out the YZ for the class title. For ’95, Yamaha would look to build on the strength of its proven design, to reclaim the title of the top 250 in motocross.
What kind of suspension did a Yamaha YZ250 have?
In the suspension department, the YZ250 offered a very solid suspension package in 1995. In the front, Yamaha used Kayaba’s inverted “mid-valve” forks to provide an excellent ride on most surfaces. They were very plush in action, but were a little soft for heavy or expert level riders.
The big news on the ’95 YZ250 was its majorly revamped motor. After over a decade of use, Yamaha did away with their YPVS (Yamaha Power Valve System) and replaced it with an all-new design.
What kind of bike was the YZ in 1994?
If the track was dry or slippery, however, the tractable YZ was the bike to beat. In 1994, Yamaha YZ250’s were the acknowledged king of the holeshot on the National level. The hot ticket that year was to add “long-rod” kit to the 249cc YZ mill and start cashing your 1-900-PRO-RACE holeshot checks.