LTR 450 Troubleshooting Fuel System

I don't know about the LTR 450 if you're still still can be very picky. After completing my motor build, I was having problems getting my machine to start. This is a process that I used to check my fuel system with success. I hope this can help others.

[@travisbarkersr]

you are the man, wasted so much time and money trying to figure out what was wrong with my bike, would've rev up only idle, it was the fuel regulator the whole time. thank you for this video

[@juicer911]

I am glad this was able to help you!

[@atvvlogs1725]

Just so everyone knows myn was as simple as the fuel filter so everyone please check that ! I pulled my whole bike apart replaced the fuel pump,injector and fuel regulator can’t stress this enough make sure your fuel filter is tight 😂

[@juicer911]

Thank you for the input. Sometimes it can be simple.

[@banks4short923]

That spark plug trick 🫡

[@juicer911]

Boom!

[@dylankoopmans5770]

Great video man, appreciate the information

[@juicer911]

I am glad I could help ya!

[@foureyegt]

Thanks for this video really helpful , just subscribed to your channel , I have a 07 LTR love these quads ……..

[@juicer911]

Thanks for the sub!

[@DaviusDamion]

Top notch video really helped me out

[@draglt250r]

You do a good job on you videos. Do one adjusting the tps

[@andrewabreu6678]

Solid vid man ! Fighting my LTR issue, but its a little different than yours. I have very very random just cut/shut offs. Tends to be when im coming to a rolling stop after getting on the throttle. Then she starts back up, no hard start, no bogging. I'm starting to thing that its an electrical issue, but i like the way you tested a few things here, think im going to give it a shot. awesome vid!!

[@juicer911]

Are you sure you are having food fuel pressure. Sound like a low pressure issue to me. Mine used to cut off after full throttle. That pressure valve is what I would change but check the pressure if you can.

[@andrewabreu6678]

@@juicer911 yeah man so i actually checked after watching your vid - it holds but pump and the FPR both have the slowest drops. Are they supposed to hold the psi, or slowly drop?

[@juicer911]

@@andrewabreu6678 I’m pretty sure they should hold. Maybe the O-ring on the inside of your pump is going bad.

[@andrewabreu6678]

@@juicer911 Just dropped you an email

[@Xeveaz]

did you ever get it fixed dawg mine does the same thing

[@DylanHenderson-en4cj]

Awesome video! Thankyou!

[@juicer911]

Glad you liked it!

[@Yourhighnesscitch]

Thanks for this video. I have an ltr and I’m sure I will need to revisit this video one day. Unfortunately.

[@juicer911]

Right.

[@samuelrussell9900]

@@juicer911 is that an aftermarket or oem gut in the pressure regulator

[@samuelrussell9900]

@@juicer911 is that part you installed oem or aftermarket

[@juicer911]

The replacement is an OEM equivalent. There is not OEM gut available. The ones from Craig at WitherowPowerSports has a lifetime warranty.

[@brandenbatalla9083]

man this video help me so much !!!!!!!!!

[@juicer911]

I am glad it was able to help you!

[@skylarpage2976]

If I get a replacement do I need the high pressure or oem one

[@jeremy2343]

Hi Kenny this is Jeremy I was just wondering if you had the top black cap on the fuel pump the that has the two nipples and then the plugin for the wires coming from the top I'm just lacking that plastic piece

[@Xeveaz]

fighting this issue with an ltz im pretty sure its the regulator not sure yet

[@user-sg3dl5vh4h]

Mine starts hard when I run it for like 20 mins or more. And my pipe becomes red about 7in from head and it’s aftermarket header and slip on? What could cause that? You think the hard starting could be something with the fuel pressure regulator?

[@Jason-zr6il]

Is the clutch side and oil reservoir supposed to be isolated? When I fill my clutch side the reservoir level rises

[@chrisveldman6988]

Do you have the part number for the regulator

[@leadaviation6383]

so i have an 08 LTR450. my mechanic just did a full engine rebuild on it. fires up and idles but it is running super lean, it shoots out 2 feet flames when you rev it up. idles way way high with the idle screw all the way down. he told me it isn't getting enough fuel, the pump was good. and the injector was good. so he said pressure regulator. did you have high idle issues before you changed out your regulator?

[@juicer911]

I would say to do the checks yourself. Don’t go based off what he said. People tend to lie. If you have done the swirl filter, delete, first thing I would do is check that filter and make sure it’s not clogged. Then Check your pressure on your regulator, remove the injector and clean it. The fuel pump is a little more difficult to explain how to repair or check. But you can make sure it’s at least getting 8 ounces and 10 seconds of flow.

[@coreypennington9059]

I just got my first ltr. It will fly. Runs awesome and everything but this unit will not idle. Changed fuel pressure reg. Fuel pump runs. Runs the three seconds and cuts off. I bump start it using second gear take off and go everywhere do whatever. I come to a stop and it will just die.

[@omarrodriguez8587]

How were you able to run the programmer I have a Mac book and it tells me I need windows computer

[@juicer911]

I downloaded boot camp. It allows for a partition to install windows on a MAC temporarily.

[@ronnieseg6]

I'm having problems with my ltr450 it's not getting fuel to the injector I just replaced the fuel pump fuel pressure regulator and fuel filter I have pressure in the lines it's just not getting to the injector, injector works tested it with a 9 volt battery and sprayed carb cleaner thru it,

[@thressiafraley8946]

My ltt450 started real good and runs good for five minn then dogg as hell the ER n kill it and it runs good agean

[@pochorroles2002]

friend could you help me please what happens that I have a ltr 450 and it does not have the upper sensor I translated see if you can help me

[@juicer911]

Upper sensor?

[@ernestmcintyre9523]

Did your purchase this fuel pressure regulator rebuild kit off ebay

[@juicer911]

I did but you can also get them from Craig Witherow at Witherow Power Sports.

[@ryancloonan6597]

Hey Kenneth, Do you have a link to the fuel regulator?

[@juicer911]

If you are on Facebook, look Craig Witherow with WitherowPowerSports. He was my connect.

[@junioraviles4454]

I went to a shop and told them when my engine is cold it takes a while to start but when it’s hot it starts right up they said valve adjustment

[@juicer911]

Or weak battery. Usually when is valves, it starts easy, but it is hard to start once warm.

[@lenininda4830]

what size of tires did you have friend

[@juicer911]

I can’t remember exactly. But I think that they are 20s in the front and 19s in the rear.

[@mrthrottle4587]

My ltr 450 will not run unless I unplug fuel pump, if fuel pump is unplugged it will idle and rev a little. (If I try to start it all hook up it’s get way to much fuel and won’t fire up).( If I have it idle with fuel pump unplugged and try to plug fuel pump back in it dies)My regulator is holding pressured 42psi. Injector clicks

[@juicer911]

Are you sure you’re using the right plug? The fuel pump and the fuel injector plug are pretty much the same

[@juicer911]

@@mrthrottle4587 it should not run with fuel pump unplugged at all.

[@mrthrottle4587]

Do you think my injector could be stuck open?

[@juicer911]

You gotta be trollin.

[@mrthrottle4587]

No? I’m for real trying to fix this thing!

[@luishuerta1165]

Do you have the link of where you bought the regulator?

[@juicer911]

facebook.com/witherowpowersports Craig is the man!

[@tjmiller7807]

Nice im gunna check all that on mine did you just get the rebuild kit on amazon

[@juicer911]

I got the part from WitherowPowerSports. Craig is an upfront guy!

[@tjmiller7807]

Nice yeah my ltr blew up on me had to a new top end and put it all back together for no pump pressure 🤦‍♂️🤣

[@rudycornelius5119]

Hey bro have you ever had no spark issue on yours? I need help mine will spark 2-3 times the first time i push the start button and then spark gone! Im out of ideas. Please help

[@Ii-je2dx]

Дачик пания

[@crunchtyme4859]

had the same issue with mine, it was my tps sensor

[@juicer911]

It is always good when you get these things figured out.

[@pochorroles2002]

If I had a way to communicate with you

[@albertocorona5718]

Where did u get the part at ?

[@juicer911]

What part

[@stunnascott1145]

Mine sit up a year now it’s not starting I put new gas

[@juicer911]

time to check that fuel system!

[@stunnascott1145]

My top end was bad 80 percent leakage wat the shop told me so I just rebuilt the whole motor

[@jhorn7960]

What brand pressure regulator did your install on your LTR? Thanks

[@juicer911]

I purchased my regulator from Witherow Power Sports. Craig is a great guy to work with.

[@rudycornelius5119]

You have an idle screw on yours? What were you adjusting to lower the idle there?

[@juicer911]

There is an idol screw on the back of the throttlebody. A flat head screwdriver should fit there.

[@rudycornelius5119]

@@juicer911 thank you

[@Xeveaz]

whatever yall do don't buy a cheap injector buy the oem one you are going to end up wasting a lot of money replacing regulator,gas pump, etc just for it to be the cheap injector i bought one and mine only runs when you disconnect the aps

[@juicer911]

Oh yea. When it comes to electronics, I try and avoid the cheap cheap stuff. Nothing but OEM with the catering components

[@hjones3054]

Sounds to me like a tight intake valve

[@zerano_4826]

Hei man, my LTR is cutting out and now wont start ..

[@juicer911]

A lot of potential issues, still have spark and compression?

[@zerano_4826]

@@juicer911 yee.. but still no start

[@michaelcotton435]

Hey man can you fix mine

[@juicer911]

If you are local, we could consider something

[@timjohnson9230]

Mine was doing the same thing. I couldn't find a rebuilt kit, ended up buying a whole new regulator.

[@juicer911]

hope that it fixed your issue

[@timjohnson9230]

@@juicer911 it did

[@user-sg3dl5vh4h]

Mine starts hard when I run it for like 20 mins or more. And my pipe becomes red about 7in from head and it’s aftermarket header and slip on? What could cause that? You think the hard starting could be something with the fuel pressure regulator?

[@juicer911]

Lean for some reason possible. Check your fuel pressures. Those are good, depending on your modifications, it may need more fuel. Or some heater pipes or just thinner material and OEM.

[@user-sg3dl5vh4h]

I forgot to mention it also has a cherry bomb plug in if that make any difference