ltr 450 won't run all the time

[micro10]

It's a 08 ltr 450.The problem we're having is it won't stay running ,goe's to missing and popping after a couple laps at the track.Acts like it's loosing fuel.We changed the fuel pump,regulator and cleaned out the fuel system,ran great for the first heat race then started doing it again in the second heat.Started checking the electrical system,battery was low and wasn't charging.Put in a new battery and checked the voltage regulator,cleaned out the plug and added a ground strap to engine.Now it's charging and battery staying up.Went to the track last night,same problem again.Checked the plug and it looks to be running lean.It's holding 43 psi on the fuel preasure.Could the TPS be bad and cause this or should I be looking for something else? Any help would be great.Don't know much about the EFI. Thanks Wade

[trx#9]

No to the tps, clean your injector and replace your fuel filter again. Sounds like you got a bad batch of gas somewhere. Also check your gas tank vent is working too.

[micro10]

We haven't checked the injector,but it's been a new tank of gas every race.Will check the filters again.Just starting to get annoying.Can you hook this up on a computer to check it out?Since we have it in our micro sprint the Suzuki shop up here doesn't seem to care about helping us out.

[trx#9]

I have an ltr as well and i had the same problem and it was the injector. I clean it and the bike now runs great now, it took us a little while to figure it out too. 

[Kawa3]

I would just buy a new injector as you can never really "clean" them out perfect.

[micro10]

Looks like we be doing the injector now.I'm running out of parts to change.

[trx#9]

Looks like we be doing the injector now.I'm running out of parts to change.

just clean it, you dont need a new one.

[micro10]

How do you go about cleaning one??

[trx#9]

How did she come out?

[micro10]

The good news is cleaning the injector did wonders,it was flying.The bad news is it dropped one of the exhaust valves and quit running.So got the head off to put in some new ones.Thanks for all the info.
We picked up a '06 LTR last week,the engine runs fine but theres some thing broke in the tranny.You can't push it more than 5 or 6 feet before it locks up.When you push it backwards it will roll 5 or 6 fett locks up,but if you push it hard it rolls with the starter motor engaged.So that ones coming down now.

[trx#9]

The good news is cleaning the injector did wonders,it was flying.The bad news is it dropped one of the exhaust valves and quit running.So got the head off to put in some new ones.Thanks for all the info.
We picked up a '06 LTR last week,the engine runs fine but theres some thing broke in the tranny.You can't push it more than 5 or 6 feet before it locks up.When you push it backwards it will roll 5 or 6 fett locks up,but if you push it hard it rolls with the starter motor engaged.So that ones coming down now.

Yeah a lot of times when they are running great is when they break, any how if you ever an engine builder let me know.