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Cracked intake boot

This is a discussion on Cracked intake boot within the Yamaha YFM350 Raptor/Warrior ('87-Present) forums, part of the Performance /Technical category; I was wondering if anyone else has had trouble with their intake boot cracking. Mine has just cracked for the second time and it's only ...


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Old 05-08-2005, 04:07 AM   #1
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Default Cracked intake boot

I was wondering if anyone else has had trouble with their intake boot cracking. Mine has just cracked for the second time and it's only a '04. Isn't this unusual for these to be doing this? Especially on a Warrior that is only 1 1/2 years old? Is there anything to look for that could be causing this? The first time I had cracked uppper motor mounts too which I suspected caused the problem the first time but this time they aren't cracked. I'm also worried too now because I was riding it at the dunes the last time I had ridden it and worried the the motor sucked in a ton of sand. Should I be thinking about taking the motor apart and checking for sand? Man this is frustrating, I wanna ride!!!!!
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Old 05-08-2005, 08:22 AM   #2
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Check all your motor mounts and make shore there tight, also check to make shore ur crab is on tight.

Boots to wear and crack over time, but having gone threw 2 on a 04 isnt right

about taking apart ur motor....its better safe then sorry, one good check you can do is take off you carb and boots and every thing so that ur right on the intake to the head and feel around there and check for any grim or dirt, if there is some then you might want to start taking some things apart
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Old 05-08-2005, 12:06 PM   #3
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Does it sit in the sun all the time? Maybe the rubber is dry rotting. As for suckin sand in the motor, why do you you think it did? Did you run without a filter or something? It cant just get sucked in there.
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Old 05-08-2005, 12:24 PM   #4
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I wouldnt worry about ripping anything apart to check for sand. Take a look at the carb while changing the boot and make sure its clean. As for sand getting in the motor. Technically whats done is done. You had an air leak. If it sucked in sand. It Sucked it into the piston and cylinder area and spit it out the exhuast. If it damged any in there theres nothing you can do about it.
If its runnen fine now It probbably wil for some time. But you may have shortened ring life somwhat..............I wouldnt worry about it.
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Old 05-08-2005, 12:37 PM   #5
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I agree with what Jstcriusen said. I didnt even realize that it cracked in th dunes. Guess I wasnt thinkin.
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Old 05-08-2005, 01:25 PM   #6
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when i first got my quad it had a cracked in take boot.. but after i got the new one on it never did it again. so far
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Old 05-08-2005, 02:36 PM   #7
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my 250r had the same problem, just replace it, better to be safe then sorry...go to www.yamahaoftroy.com one for my 250r was only like 35 bucks...
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Old 05-08-2005, 06:35 PM   #8
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I already ordered one off ebay for 32. It stays in the garage when I'm not using so the sun doesn't get to it. I hope I can find out why two have cracked already. I suspect that the carberatur is may be sitting to far back from the engine perhaps. I'll have to take a look when I take it apart.
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Old 05-08-2005, 07:21 PM   #9
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I think they can be put on upside down i had one crack and it was on upside down. I am not positive of this but my buddys was on different than mine and when i got a new one i never had another problem.
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Old 05-09-2005, 11:14 AM   #10
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Most cleaning prducts eat that rubber, especially engine cleaner. My orig boot finally cracked after 10 years, but I didn't shine the bike up much.Too busy riding.
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Old 05-11-2005, 09:31 PM   #11
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I have replaced a few of them over the years. Worst thing is trying to tighten or loosen the 2 nuts between the carb and boot while jetting. Take the time to hold the carb while wrenching on the nuts. Most of us let the boot twist a little to hold the slack when we tourq the nuts. guilty
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Old 05-12-2005, 11:03 AM   #12
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I had just replaced mine yesterday, and low and behold I had installled it upside down, and that is what caused it to crack. the o ring goes toward jug, and the arrow points up, you will do fine and they are correct to not let the nuts twist the boot while tightening it. good luck...
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Old 12-17-2012, 10:53 AM   #13
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I know this thread has been dead for years, but I've had this carb boot ripping problem too, if I cut out the rubber center and welded a piece of metal in its place, could it do any harm??
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Old 12-17-2012, 09:36 PM   #14
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They are rubber for a reason. You want the carb to be able to flex. If you make it solid you might end up breaking the carb ears or something more. These boots last for years if installed properly and all motor mounts are tight and in good shape. If they keep breaking then there is an underlying problem causing it.
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