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Engine Stalling

4422 Views 44 Replies 13 Participants Last post by  Mikeltr450
I just got off the phone with my brother in law. He is out at Pismo with my quad right now and told me of 3 issues it's having. The most important is that when he is going down hill it some times cuts out. He said it's completly random. I was maybe thinking TOS but any other ideas? It acts like it just runs out of gas.

Second is he said it is having trouble starting. He said it happens most the time when it's hot. Trys to start it and just click, like a dead battery. If he turns the key all the way off then back on though it starts back up normal. Is this normal?

Third he has been drag racing a 2005 YFZ 450 and been losing. They are switching off and the YFZ keeps winning. I'm thining WTF since the 05' is a 439. All he has done to it is a Dubach pipe, K&N, no lid, and jetting. I know that's all he has too, good friend. They are telling me who ever gets the hole shot wins the first half but the YFZ has more top end. I'm confused...
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No yellow on it, sorry. I was reading on the clutch thing to but never got a defenite answer on there if it solved the problem.
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I think your LTR is having behavioural problems, it misses you . LTRs become attached to their owners. Just like KITT in Knight Rider. Could anyone drive KITT but the HOFF, I don't think so! The same is true with LTRs. Better get State side soon as you can.
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Problem #1 does sound alot like the infamous fuel filter
Problem #1 does sound alot like the infamous fuel filter
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could be but book sais i dont have to be replace for 4 yrs and they even play it on the safe side but could have one of those odd ball ones tho
That first problem could be a few different things...may want to take care of that tip over sensor while we're trying to knock possible problems out of the way

could be but book sais i dont have to be replace for 4 yrs and they even play it on the safe side but could have one of those odd ball ones tho
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Some more quick info on the filter thing, problems don't seem to be very isolated

http://www.ltr450hq.com/invision/forums/in...0&hl=filter
It sure sounds like the fuel filter. If I have just been using pump gas this shouldn't be on me to repair. I'm going to have my brother in law dump it off at the shop and just have him explain what it is doing. If they try to charge me I'll just raise hell. It shouldn't be plugging with pump gas. Not with less then 15 hours on it.

They are trying the clutch perch thing. I just kind of explained it to him and he knew exatcly what I was talking about.

The losing thing gets even more confusing because the YFZ and LTR are using the same type of Haulers. I don't think it's 6 paddle though. :( Pissing me off.
I hope it isn't causing too much for problems so that your brother can still have a decent time.

It is JMO, but I really don't think that the filter is your issue. First you havn't ran the bike much. Second, it seems to be giving problems when going downhill(out of the throttle) so not much fuel is being demanded. I would have expected to hear of the cutting out while drag racing if it were a fuel filter problem. Unfortunately, I don't have a decent suggestion. :( Probably electrical. :unsure:

Also, I wouldn't worry about the yfz much until you get your nice paddle on there. Also, stock gearing doesn't work well with the bigger tires and a lot of hook up(sand). Once you get better tires on and better gearing, the results will improve. And yfz's are nothing to laugh about... fast bikes.
i had the EXACT same prob check the wiring going to the key it might be pulled out nor loose
The clutch perch relay is for starting only....once it's running....shouldn't affect it.
Also, when it is shorted....NOTHING happens....NO click.
I wouldn't trust Clone...he's too wishy washy...
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I wouldn't trust Clone...he's too wishy washy...
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I know the YFZ's are no joke, the 06's are good bikes. I almost bought one. The thing is he has the 05, that's a 439cc engine not a 449. That's why I was pissed that they keep telling me his YFZ has more HP then my LTR. Mathmatically it's impossible, I just don't think my quad is set up right.

I don't know about what is wrong with my quad at this point. I'll probably just tell them to take it to Zuki and have it fixed before I get home.
while its running wiggle the wires going to the key if its the same thing that happened to me it'll start killin the engine
I know the YFZ's are no joke, the 06's are good bikes. I almost bought one. The thing is he has the 05, that's a 439cc engine not a 449. That's why I was pissed that they keep telling me his YFZ has more HP then my LTR. Mathmatically it's impossible, I just don't think my quad is set up right.
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Ahh, don't get caught up in cc's. There is way more to it than size of the motor. Yes, I know that particular bike is mostly stock, but in general, cc's is only a piece of the puzzle. I'm not down with the "no replacement for displacement" saying......
I just got off the phone with my brother in law. He is out at Pismo with my quad right now and told me of 3 issues it's having. The most important is that when he is going down hill it some times cuts out. He said it's completly random. I was maybe thinking TOS but any other ideas? It acts like it just runs out of gas.

Second is he said it is having trouble starting. He said it happens most the time when it's hot. Trys to start it and just click, like a dead battery. If he turns the key all the way off then back on though it starts back up normal. Is this normal?

Third he has been drag racing a 2005 YFZ 450 and been losing. They are switching off and the YFZ keeps winning. I'm thining WTF since the 05' is a 439. All he has done to it is a Dubach pipe, K&N, no lid, and jetting. I know that's all he has too, good friend. They are telling me who ever gets the hole shot wins the first half but the YFZ has more top end. I'm confused...
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i would say that to me it sounds like an electrical issue, and as for the tires, i've seen alot of races won at dumonts comp hill on sandstars over straight blades-i.e. skat-traks and personally i'm a fan of the sandstars because they seem to take less h.p. to run. i haven't tried a double or triple buff tire that are said to grow under power but if the tire gets taller so does the gearing when combined with a hill equals slower?
and as for the tires, i've seen alot of races won at dumonts comp hill on sandstars over straight blades-i.e. skat-traks and personally i'm a fan of the sandstars because they seem to take less h.p. to run. i haven't tried a double or triple buff tire that are said to grow under power but if the tire gets taller so does the gearing when combined with a hill equals slower?
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Well if sandstars were winning, then the SS bike just had more hp and their gearing was better. I won't trash talk SS's too much as I think they are a decent molded tire. But it is simple, they are heavier and don't hook up as good as a properly matched hauler. You can't just slap any hauler on any bike. It took me a lot of testing to find the one's I like, but it was worth it. Gearing and paddle choice is sooo big. Really takes a lot of time, $$ and testing to find the right fit. And the tire growing again goes with gearing and hp matching the tires just right. If everything works out like it should, when the tires grow, it should be like a variable transmission that never slips... it just keep going faster for you and slows back down when you let off. :D
This is more updated info on how my quad ran at Pismo.

The cutting out part. It happens random and it acts like it runs out of gas. The electrical doesn't cut out it does that BLAH blah blah and dies. It was MAINLY happening when you shoot a dune. When you were on your way back down the dune it would sometimes die. It did happen once or twice in the flats. Since the engine has had less than 15 gallons run through it I doubt it's a fuel filter issue.


Performance/Hot Start part. My bro in law was telling me that the head pipe was red. Now I know everyone said that's not abnormal. However it was so red it's now burnt black. It also back fired when you let off the gas right before going up a dune. I was noticing some back firing too when I was home. He also raced 2 "stock" LTR's and lost to both. One had paddles with stock pipe, I assume no baffle, and one had stock tires. He would beat them on the holeshot because he started first but they would eventually pass him. All races ended with in one to two lengths. The 05' YFZ would walk the LTR after 3rd gear. Note the YFZ and LTR were both using the exact same 8 paddle haulers. He believes it is running lean. He think's that is why it is also having trouble restarting. He thinks I should buy a power commander. Now that doesn't really bother me because I wanted one anyways and this will convince my wife to let me get one. Any input? I'm going to look into the manual that I got on CD here. Try and look into stuff.

He did try the clutch mod thing that we read about in other posts and that didn't fix it.
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