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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 20 Sep 2019
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carb boots
Has anyone had any trouble with aftermarket carb boots possibly on wrong angle or shorter than original boots?

the rubber air intake are 5mm short - alignment indicators are lined up with airbox notches...

Cheers
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  #2  
Old 21 Sep 2019
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Funny, I just replaced my XT600Z carb boots (intake) with aftermarket ones today.
They fit perfectly. They have 43F marked on them as well as 1VJ.

Regarding angle, make sure the right one points outwards. Mine went outwards by 1mm but it's hard to see.
I have the vacuum operated ones. That vacuum tubed one goes on the left



edit: i just realized you are talking about carb<>airbox?.. since you are talking about the alignment...
Sorry can't help you there. Still using the stock ones
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  #3  
Old 23 Sep 2019
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Originally Posted by Doubleyoupee View Post
Funny, I just replaced my XT600Z carb boots (intake) with aftermarket ones today.
They fit perfectly. They have 43F marked on them as well as 1VJ.

Regarding angle, make sure the right one points outwards. Mine went outwards by 1mm but it's hard to see.
I have the vacuum operated ones. That vacuum tubed one goes on the left



edit: i just realized you are talking about carb<>airbox?.. since you are talking about the alignment...
Sorry can't help you there. Still using the stock ones
I brought the cheapest one from aliexpress and found the clutch side boot not as angled and looks straight. The previous set had 43F marked on them slightly longer but didn't last long before the rubber separated ..... I loosened the airbox bolts and managed to find a couple of mm just enough to clamp the ducts..... possibly the age of the rubber ducts shrinking..

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  #4  
Old 23 Sep 2019
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guess you get what you pay for


i had luck with after market boots from ebay.de, cheaper than OEM but not dirt cheap as aliexpress....


and no, there's no way carb boots will shrink 5mm... worst is they harden to rock state, but certianly no 5mm shrink, sounds like wrong boots to me
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  #5  
Old 23 Sep 2019
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btw, few months ago i've met one guy, who used to ride ~90's xt600 during couple years.
he said that when he had one of that boots failed, he removed both, tore rubbers away and reshaped carb looking sides with tig weld to create cylindrical elevation, and, as he told, he got a "lifetime solution" about them just with some rubber tube of proper diameter and thickness..
and he sad that he hasn't noticed any later issues with performance (my question was about an impact of possible changes in gas flow through that improvised routes).

so, i plan to try his method when the time will come to change my boots. it will be well less than half price of good quality aftermarket boots.
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Old 24 Sep 2019
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Originally Posted by N67 View Post
btw, few months ago i've met one guy, who used to ride ~90's xt600 during couple years.
he said that when he had one of that boots failed, he removed both, tore rubbers away and reshaped carb looking sides with tig weld to create cylindrical elevation, and, as he told, he got a "lifetime solution" about them just with some rubber tube of proper diameter and thickness..
and he sad that he hasn't noticed any later issues with performance (my question was about an impact of possible changes in gas flow through that improvised routes).

so, i plan to try his method when the time will come to change my boots. it will be well less than half price of good quality aftermarket boots.

my 92 is still on originals, feel soft and supple... maybe im lucky...but even if you had to change them every 5-10 years, sounds total overkill to me.... and welding the carbs (if i understood right) has a good chance of distorting the bodies.


all my race bikes have custom manifolds for flow, but all i do is turn on the lathe an adapter to fit a cylindrical rubber to the head (sudco has a range of sizes), never had to weld carbs or head
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  #7  
Old 29 Sep 2019
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Originally Posted by N67 View Post
btw, few months ago i've met one guy, who used to ride ~90's xt600 during couple years.
he said that when he had one of that boots failed, he removed both, tore rubbers away and reshaped carb looking sides with tig weld to create cylindrical elevation, and, as he told, he got a "lifetime solution" about them just with some rubber tube of proper diameter and thickness..
and he sad that he hasn't noticed any later issues with performance (my question was about an impact of possible changes in gas flow through that improvised routes).

so, i plan to try his method when the time will come to change my boots. it will be well less than half price of good quality aftermarket boots.
I have thought about this... it's never nice welding contaminated alloy then not knowing how much it's going to distort... have to reface it and cut a o-ring groove?

Easier to start from scratch with stainless... I haven't measured the diameters but I imagine there must be tube out there close enough.... I guess there will be possible internal steps that may disrupt the air/fuel flow....trial and error I guess...
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Old 29 Sep 2019
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Originally Posted by turboguzzi View Post
guess you get what you pay for


i had luck with after market boots from ebay.de, cheaper than OEM but not dirt cheap as aliexpress....


and no, there's no way carb boots will shrink 5mm... worst is they harden to rock state, but certianly no 5mm shrink, sounds like wrong boots to me
Very true.... made the rubber air ducts stretch and clamped to carbs...still not perfect but its holding... I will need to keep an eye on it...
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