Suzuki LTR 450 rev, backfire and stalling issue (Problem solved)
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- čas přidán 8. 03. 2021
- Rev problem on my Suzuki LTR 450. I've been having this problem since I bought it second hand just over a year back. It's got a stage 2 intake hot cam in it, cherrybom and airbox open. I've adjusted the TPS sensor according to specs, valve clearance checked and in spec, fuel injector cleaned and tested. Why would it only do this sometime?
I'm losing time in my races in the pits when I'm switching the quad off to refuel and having this issue when I'm starting it again.
So here is what the problem was and how I fixed it...
First I checked my throttle body butterfly valve as the previous owner had a hand adjusting screw on it. I closed the butterfly valve completely and turned the screw just touching the valve and keeping it completely closed.
Then I adjusted the TPS sensor again to spec at 0.6 V.
Then I checked my idling air screw... It was turned out 3.5 turns. The manual spec is 1 5/8 turns out, which means mine was way too lean with the throttle body valve also a bit open. So I adjusted the idle air screw 1 5/8 turns open, started the quad and what do you know... it started easier, sound smoother, revs up with no issue and the abnormal backfire is also gone, just popping now and then on deceleration.
It's been 2 months since I fixed it and had no starting, rev or stalling issues. Seems like such a small thing that fixed about a years struggling with it.
Hope this could help some of you out there with the same problem. - Auta a dopravní prostředky
I am having the same exact problem with my LTR 450 I am definitely going to try this and see if it fixes my problem
Let me know if you got it sorted and if you need more advice
@@racermac1081 when I get home from work I will give it a try and let you know if it worked
So I checked it and mine is set to spec but I am still having the problem I'm thinking I have a bad tps
@@jacobgoodrum5675 check the voltage of the tps, it should be 0.58V - 0.62V at closed throttle. Then slowly open throttle to see if it increase smoothly to around 4V It's something causing it to go in safe mode.
@@racermac1081 OK so I spliced into the black and yellow wire on the throttle positioning sensor and it sits exactly at .60 V and I gradually apply the throttle And the voltage climbs very smoothly all the way till it maxes out at 3.75 V
My bike is having a similar problem, it keeping back firing and bogging when I get it running changed the carb and spark plug, still doing the same thing but sounds a lot better and when I rev it high that’s when it wants to bog and rev any help or advice would be great
If you have an aftermarket exhaust on, then it most probably is too lean, especially on high revs. Just try bigger jets first and see if it helps. Also the fuel filter needs to be changed very often
The ltr450 is fuel injected......
I’m having same problem
Can you help me, I have a problem right away, but I turn around fine at idle, and when I give gas, he doesn't take it badly, and he has no power
Try cleaning the fuel injector
Replace fuel filter it be easier to feed the engine running constantly like new
What was the issue ?
I've written it in the description. It was the air screw that was too lean
By the throttle body
Did u find out what it was
Yes, I adjusted the air screw at the throttle body to spec 1 1/2 turns open. I was almost 3 turns open. Far too lean for idle. I think it had something to do with CDI, cause it would go into safe mode and then would not rev. After adjusting the air screw it did not happen again.
Where is this air screw, could it be causing a hard start?
Donde se encuentra el tornillo?
What was wrong
in the description. It was the air screw that was too lean
The one by the throttle body
@@racermac1081 there is no air screw, only idle
@@sebastienwerle4254 that idle screw is the air screw. It gives more or less air to adjust the idle
Replace the injector
Thanks for the advice, I fixed the problem about 2 months back. It had nothing to do with the fuel, but everything with the amount of air going into the engine.
@@racermac1081did you adjust your throttle body screw to fix this problem? Mines been freshly rebuilt and I am having same issue after rebuild
Yes, the thruttle body screw was a bit out, but the air idle screw was out too much as well. Not sure if this was the issue, but after adjusting it too spec the quad started@@baleycasady7438
@@racermac1081 ok Thank you !!! 10/4 my mechanic said the idle screw is factory set with paint over a lock nut located inside of throttle body. He said never touch this. He said only way to adjust the idle is by taking that lock nut off from inside throttle body. Witch he said never do this ! ..
The throttle body screw is a brass screw under the seat. My rebuild cost Jan 2023 $5,800 ..it does 71 mph ...JT sprockets 13 front 36 rear sprocket, D.I.D racing chain.
@baleycasady7438 Yes, he's right to never adjust that throttle body screw, but I bought mine from the previous owner that had an adjusting screw on that one that should not be adjusted, so I took that out and adjusted it to spec with lock nut. The brass one is the air idle screw and if I can remember correctly, it should be around 1 and 5/8 turns out from completely closed