[SamUK]

I don't do much deep mudding this is more of a safety feature than a necessity as the off-road park I go to most times does have some deep holes that the trucks dig out. It might be a shallow hole this week but next week it can swallow you up!
So, what size pipe do you guys use? Available to me at the local hardware store is 1 1/2 inch with all the necessary bends/fittings etc.
Secondly, do you find silicone sealant does the job? I was going to use PU adhesive sealant.
Last but not least, do I need to waterproof anything else? All my breathers are replaced and extended.

Any do's and dont's?

Thanks guys.

 

[mac102004]

Yes fill all electrical connections with dielectric grease, run all of your vent hoses to the top of the snorkel, run your crankcase breather tube either into the airbox or to the top of the snorkel as well. Make sure your one way check valve is working on the bottom of your carb bowl...other than that you should be good to go


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[fishfiles]

I use 1 1/2 pvc on the 300's , on my 450 I used 2 inch , I use the blue pvc pool glue on pvc to pvc connections after sanding and priming and 3M 5200 on the rubber to pvc boots and grommets on the air box

 

[SamUK]

Thanks guys. My breathers are already extended and ready to run up the snorkel. I'm assuming I don't need to re-jet the carb providing the plastic pipe is big enough?

 

[Redleader20]

We did my buddies Kawi and yes that isn't a Honda but we didn't rejet his bike and it ran fine so u shouldn't have to worry about it

 

[SamUK]

Thanks Red, I didn't think isn't need to providing the pipework is big enough.

 

[alloutdoors]

Be sure to post some pics of the modification....

 

[SamUK]

Be sure to post some pics of the modification....

The only pic I have at the moment, I haven't had chance to get down the shed this weekend.

 

[fishfiles]

are you going to have it outside the fender ? I put it under the fender , this is about the best pic I have that shows my whole snorkel in one pic , I use a piece of industrial vacuum hose to give it some flex , makes putting it together easier also makes it easier to come out the bike if needed , the vacuum hose fits tight into the pvc couplers and with some 5200 3M , the pipe will break before the 5200

 

[rodp]

Sam should be off line at the moment taking a deer stalking test so I'll explain the idea. Good plastics are very hard to find over here so I think his idea was to run the snorkel outside instead of cutting holes in the front plastic.
To give some idea of the atv spares situation here I was offered (unseen) £400 ($500?) for some used 350D plastics, I turned it down. Plastics are sort of ok with some repairs. 300 plastics in decent used condition with some damage would fetch around $100 a section (front / rear) and that would not include hatch covers etc. Undamaged ones would fetch a lot lot more.

 

[SamUK]

Sam should be off line at the moment taking a deer stalking test so I'll explain the idea. Good plastics are very hard to find over here so I think his idea was to run the snorkel outside instead of cutting holes in the front plastic.
To give some idea of the atv spares situation here I was offered (unseen) £400 ($500?) for some used 350D plastics, I turned it down. Plastics are sort of ok with some repairs. 300 plastics in decent used condition with some damage would fetch around $100 a section (front / rear) and that would not include hatch covers etc. Undamaged ones would fetch a lot lot more.

Yes, that's exactly the idea. If I come across a set of front plastics that are in worse condition than mine I'll probably fix them up and then route my snorkel through the worse set rather than cutting holes in mine which are in good condition.

 

[SamUK]

Back again with snorkel issues guys..

So i built my snorkel and tested it for leaks by filling with water, while it was removed from the ATV of course! Lol. My issue is this, where the drain pipe tubing goes into my air box it hadn't sealed, I left the original rubber seal in there and used the 3M's adhesive sealant but the plastic tube won't bind to the rubber.
How do you guys get around this? Am I using the wrong sealer/adhesive?

 

[mac102004]

I just clamped mine on as normal with a healthy application of RTV silicone. No problems.


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[SamUK]

Bumping this thread back up..

Last night I finished rerouting my snorkel, I bit the bullet and took the holesaw to my front plastics/fender. As the sealer was wet I didn't fire it up until this morning (the morning were due to ride!) and it struggled to start, when it did I had a major bog, obviously this is lack of air as when I removed the air box lid it ran fine.

Here's my question.... Do you guys use 11/2 inch tube throughout the whole length of the snorkel or just out of the air box and then up to a bigger diameter tube?
I genuinely thought 11/2" would have been fine, obviously I was wrong!

I think the hardware store has 2" or 2 1/4" available so that would be my next option I guess.

 

[fishfiles]

Sam , I have 3 300's that have snorkels made from 1 1/2 pipe PVC pipe ( 1 1/2 " I.D. = inside diameter ) and run perfect , try re-adjusting the carb

 

[SamUK]

Sam , I have 3 300's that have snorkels made from 1 1/2 pipe PVC pipe ( 1 1/2 " I.D. = inside diameter ) and run perfect , try re-adjusting the carb

I'd considered adjusting the carb, I then thought that I shouldn't really have to because in theory it would be running rich if I did that. Ideally I'd like to not tinker with the carb, it's set and runs well.
I'm due to overhaul my carb anyway so I'll leave the snorkel off until I've done that then look at either making it bigger or possibly tweaking the carb.

 

[fishfiles]

....something that happened today that is snorkel related by not your model , a friend called me up with a problem , his brother-in-law bought two Yamahas that were on Craig's List , I seen them and he got them cheap cause one didn't run and the other wasn't running right , a 250 4x4 was freshly snorkeled and he tried everything to get it running right , he said it would run great at idle but would not take the gas and bogged out when you applied more throttle , I remember that another friend just went thru a problem with his grand-sons Yammy , he had snorkeled it , it ran great before the snorkel and terrible after wards with the same symptoms , he found that when he snorkeled it he extended and ran the crankcase vent up with the snorkel , when he put the crankcase vent back into the air box where it originally was , closed the cover on the air box and the bike ran great , so I told my other friend and he called me back and said that fixed it , I don't know the physics behind that one , maybe it is only a Yammy thing as I always run the crank vent up with the snorkel and I have never had that problem but strange things happen

 

[fishfiles]

Sam , I have 3 300's that have snorkels made from 1 1/2 pipe PVC pipe ( 1 1/2 " I.D. = inside diameter ) and run perfect , try re-adjusting the carb

I'd considered adjusting the carb, I then thought that I shouldn't really have to because in theory it would be running rich if I did that. Ideally I'd like to not tinker with the carb, it's set and runs well.
I'm due to overhaul my carb anyway so I'll leave the snorkel off until I've done that then look at either making it bigger or possibly tweaking the carb.

as long as you count the turns , you can always go back to where it was , look at the plug and adjust as needed

 

[SamUK]

Ahh, now I've got my crank breather going to the air box, I might take it off and give it a try though.

 

[fishfiles]

I really don't think is going to make a difference on the 300 moving the vent tube out of the air box as far as running goes , but you never know , all my crankcase vents go up with the snorkels and I have no problems with them not running good , but it seems some model Yamahas like the vent in the box or they don't run right ------ I would run that vent line up with your snorkel for another reason , if the air box where to ever flood then water would have a direct path into the crankcase thru the vent hose