I bought a new 2003 Tb 400 for bro was wondering when its time to mod it do I have to go do away w the injection if I go put V force reeds an a hpd or hot seat pipe on it etc?I would love to get the head to for it does that make a seat of the pants difference n power an torque?

 

A pipe and clutch kit make HUGE differences with these machines. You will not believe that it is the same bike. Just stick with the main Polaris aftermarket suppliers, RCR, HSP, HPD or AAEN.

As for the oil injection, well I myself like it and wouldn't remove it, Others on here say get rid of it as soon as possible, It really comes down to personal preference. Some of the earlier models were prone to failure but I think thing have came along way. As for the Mods that you plan using, It shouldn't make any difference either way you go (to inject or to pre-mix).

 

The oil injection is really pretty reliable. I wouldn't get rid of it unless you're gonna go full out with mods.

 

boyesen rad valve + k&n air filter+ HPD pipe and clutch kit,the seat of the pants feel will be faster.

 

I purchased the hot seat speed kit,,with the header pipe and silencer,,,first it comes with an adjustable flange that doesnt fit the bike,,So i had to use the stock flange,,then with everything installed the bike didint have the take off,,it missed when you hit the throttle,,barely even pulll the front end up..so my mechanic used the stock pipe and silencer combo,,what do you guys think the prolem is,,,,,

 

Keep the injector. Lots of guys mod their snowmobiles, but except for full-on racers, you never hear them looking for block off plates for their injector.

 

I replaced mine with a hot seat block off kit because the cable was broken and frozen in the oil injector housing. I bought it used but i would have loved to keep it. It was so much easier. YOu can just pull up to the gas pump and not worry about mixing.

 

I removed mine and am glad I did I would much rather rely on myself to mix my gas than the pump it's too critical of a process.

 

Snowmobiles have been running injection for decades (Yammy started in the early 70s). Failures are VERY rare and I, personally, have never heard of anyone that had one fail. The only problems I've ever seen are pumps sticking OPEN and pumping in too much oil (smoky, but certainly not harmful.) And I live in the heart of snowmobile country and have been riding for 30 years and so have most of my friends. Oil injection is proven, reliable technology.

 

I used to have a trailblazer and it's pump stuck as you mentioned after that i haven't trusted them.