hey i think i might sell my trailblazer this winter and get a 250r that is running or needs minor work. so im wondering how fast are they with pipe? porting? how easy is it to work on them? please say anything else u think of them. thanks!

 

IMO If you are looking for doing work a R is what you want.. If you have problems there easy fix's jetting is simple... I heard that porting totally changes the machine and the pipe will do some.. If you get the jettign down and airfilter with lid off.. The 1986 had a short crank for meaning faster rev's and the 1987 to 1989 longer crank for more low end power.. Wich ever one you want si for the type or riding you will do... The first day I ever worked on mine I put boyesen reed valves and rejetted in a matter or 45 min's. I love my machine and I think your probobly will to.. What kind of riding do you do anyways?

 

i ride sand pits, snowmobile trails wich are straight and flat for i dont know how long i dont have enough gas to find out, and sharp dirt trails with rocks here and there. how fast do they go? like top speed?

 

First, it seems to come up time and time again.
All 250Rs have a crank with the same throw; they all move the rod up/down the same distance.
They all have the same bore when stock.
They are all 246cc when stock.
The 86 has a shorter connecting rod than other years.
The 87-89 had the wrist pin located further up in the piston than the 86. They are still the same bore/stroke.
Depending on the type of riding you do, pipe it for that. There are many pipes on the market and they are tuned usually for a specific area of performance. The FMF "Fatty" is usually a good all-around pipe with very good mid-range performance. Some are tuned for bottom end power, others are high rev pipes. If you do some slow trail/rock crawling/jeep trail stuff you might be interested in a low-end pipe.
To inprove performance on any R, open up the air box and install a high flow air filter (don't need a stupid arguement over which is better, Uni or K&N, just get one of them), pipe it for your type of riding, and remember you will need to re-jet your carb.
Also, if you are more interested in low-end power, stay with the smaller carb, if you want to drag race or just dune, a larger carb make work better for you.
Top speed on a stocker, around 72 mph.
Stock horsepower at the flywheel, around 36-38.