Sorry for the "which quad is faster" bs we hear so much about...but I'll go ahead anyway [img]i/expressions/face-icon-small-wink.gif[/img]

My friend is buying a 89 250r. It is stock bore, FMF can/pipe, reeds, piston, better carb and air filter...Maybe a few more things...He runs pump gas just like me.


He's like...oooh wait till I get it and pull up next to your little DS (don't see why he said little) and smoke you on the wheelie...I'm like yea ok...


He's only getting it next weekend so I have to wait before we race.


I have a stage 1 DS that is running very strong except for the the low-end stumble of the 45.


Who would most likely win in a dirt drag (machine-wise I mean...we can both ride decently)...Would it be close??


Jeff

 

tyre, i raced some 250r's which were close to stock, and absolutely smoked them(plus i weigh 240), so i think you should be able to take him

 

You need to know what is on the 250 before you can say!

 

All 250rs are not created equal, if they only have bolt-ons you should be fine. I raced an old guy on a slick looking 250r three wheeler and beat him by maybe 2 bikes and my DS is stock.

 

Hey tyre my bro has a stage 2 and the 45 and he has the same low end stumble.......are they all like that or is something wrong....he changed jets a ton of times and cant seem to get rid of it????
thanx Scott

 

Your stumble has somthing to do with the excellerator pump and which direction you point the nozzle?. Those that have them should be able to help you out.

 

Yea I know all about the stumble...I also know how to fix it...The parts are on the way [img]i/expressions/face-icon-small-happy.gif[/img].

 

Cool, [img]i/expressions/face-icon-small-smile.gif[/img]. Maybe Zilla would be appreciative of the information needed to cure his brothers stumble. [img]i/expressions/face-icon-small-wink.gif[/img]

 

All you need is to enable the Accelerator pump on your carb. The pump works by having a control rod connected to the throttle tube that pushes down on a plunger for a designated amount of time as throttle is applied. The plunger then squirts a spray of gas out of a nozzle that protrudes from the carb throat...The spray is aimed directly at the needle for best fuel atomization and then makes its way down the intake...


The TM45, because of it's large bore and design....cannot supply instantly the amount of fuel required to overcome the massive and sudden amount of air that is sucked into the engine when the slide is slammed open from idle to 1/4 throttle.

But the Accel. pump requires the use of a stiffer throttle return spring to be able to overcome the added tension of the control rod assembly. That means only the hulk would be able to ride a TM45 w/ the stiff spring for any amount of time with thumb throttle. That leads you with two options...switch over to twist throttle (TM45 was designed for twist throttle) or manipulate the "Light" throttle spring to make it strong enough to overcome the tension of the pump. This is a trial and error method but it can be done. Hightower shed some light on this method. Check out this thread : TM45 Accel pump made sweet for thumb


Jeff

 

250r dirtbike? too light, he'll win.