SuzukiSavage.com - does anyone

hotprops

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does anyone
03/05/15 at 11:48:33

run a fuel filter on the end of the airbox puke tube ? would act as i air filter when running and a fuel dump if you get a stuck carb float like i did yesterday mine had the factory plug in it , would have been bad if i started it . i thought about other things also to keep the dust out while running. anyplace still sell the old type that might open for fuel and close for vacuum? does the crankcase vent into the airbox as well? i think it must as i checked the tube and its contents before i bought it and only found a 1/2 teaspoon of fresh oil

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youzguyz

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Re: does anyone
Reply #1 - 03/05/15 at 12:13:40

I really can't see a reason for putting a filter on the drain tube.
It is so long, and would draw so little extra air, (as compared to the snorkel) that you could just leave it uncapped if you are worried about gas building up in the air box when you have a float system failure.

Yes, the crankcase breather vents to the airbox. The main reason for the drain (aka puke) tube is to get rid of the oil residue from the breather.

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Dave

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Re: does anyone
Reply #2 - 03/05/15 at 12:35:24

I would think that some air would be drawn up the tube if it was uncapped, and if the roads you ride on are dusty it could pull dust up into the engine.....and it would bypass the air filter. Most likely it won't be very much dust....but even a little isn't good.

One reason not to leave it uncapped, and not to put a filter on in place of the cap....... is that you will most likely drip a bit of oil when the bike is parked.

And yes....the engine crankcase vent goes into the front of the airbox and is supposed to drop the oil into the box, and burn the vapors in the engine.

Perhaps a better solution is to see if we can modify the existing carb to have an actual overflow.....like motorcycles used to have. I have a carb at home and will look to see if there is an appropriate place to put a "non-EPA" approved fuel overflow.

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youzguyz

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Re: does anyone
Reply #3 - 03/05/15 at 12:47:27

Dave wrote on 03/05/15 at 12:35:24:

I would think that some air would be drawn up the tube if it was uncapped, and if the roads you ride on are dusty it could pull dust up into the engine.....and it would bypass the air filter. Most likely it won't be very much dust....but even a little isn't good.

I thought the drain was on the intake side of the filter.. There I go thinking again.

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Most motorcycle problems are caused by the nut between the seat and the handlebars. Make sure yours isn't too tight or too loose.

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28886 L.A. California Gender:	Re: does anyone Reply #4 - 03/05/15 at 13:19:57 and a good bump will cause the breather to puke a lot of oil. so if you have that dump open, you're not going to be upright for long.
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hotprops

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Re: does anyone
Reply #5 - 03/05/15 at 14:50:16

versa please explain, and now with the raptor valve, a fuel box could be loaded with fuel ,mine had at least 1 cup of gas also do you know on a std s40 if the fuel goes into the airbox before the cylinder intake as i had the oil drain out with the kickstand on a 2x4 and most of the fuel was leaking from the hose with plug in, thank goodness, but the box was still overflowing i am surprised this has not been discussed before . yes a nuby to the s40 but been a bike owner for some 45+ years ,also a aircraft wrench my whole life ,now retired. i think it would be a good idea for raw fuel to drain from the airbox in case of a float sticking but as the deep side of the airbox is also on the wrong side of the filter so?

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hotprops Full Member Offline SuzukiSavage.com Rocks! Posts: 180 fort myers fl	Re: does anyone Reply #6 - 03/05/15 at 14:52:49 verslagen1 wrote on 03/05/15 at 13:19:57: and a good bump will cause the breather to puke a lot of oil. so if you have that dump open, you're not going to be upright for long. how does the oil that gets "bumped "ever get bach in the crankcase ?
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verslagen1

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Re: does anyone
Reply #7 - 03/05/15 at 15:11:16

Oi you're talking in circles. it helps if separate ideas with paragraphs.

1st stock bike when parked:
Gas can leak from the float valve with a leaky petcock or petcock diaphragm direct into the intake.
If you're lucky, it'll go into the airbox and not the cylinder (another reason to park uphill)

When riding, a leaky petcock diaphragm makes it run rich.

Raptorized when parked:
In the off position, no leaky, none, get used to it.
In the on position it can still leak thru the float valve as above.

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verslagen1

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Re: does anyone
Reply #8 - 03/05/15 at 15:19:01

hotprops wrote on 03/05/15 at 14:52:49:

verslagen1 wrote on 03/05/15 at 13:19:57:

and a good bump will cause the breather to puke a lot of oil.

so if you have that dump open, you're not going to be upright for long.

how does the oil that gets "bumped "ever get bach in the crankcase ?

In the head there's a little bath tub for the cam to play in full of oil.
a good bump will send the oil flying and the breather is close by.
If it happens at TDC with the piston going down will send air out the breather and any flying oil with it.

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hotprops Full Member Offline SuzukiSavage.com Rocks! Posts: 180 fort myers fl	Re: does anyone Reply #9 - 03/05/15 at 18:49:26 ok the real problem is that i have without doubt a float carb leak. waiting for raptop thingy. old thingy will not leak on run . will leak like a pig on res or prime . best place to look for said float leak? does batt box come off easy? thanks for all your help.
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Steve H Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 1223 Spartanburg, SC Gender:	Re: does anyone Reply #10 - 03/05/15 at 19:31:38 Batt box is easily removed. I hate the stiff hoses but it's not bad doing the carb. When you clean the carb, don't forget the little screen above the float valve seat.
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hotprops Full Member Offline SuzukiSavage.com Rocks! Posts: 180 fort myers fl	Re: does anyone Reply #11 - 03/05/15 at 20:12:49 to add had the vac hose plugged as well as the vac carb intake caped. ended up leaking in all positions. so petcock is bad as well as float in carb.
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hotprops Full Member Offline SuzukiSavage.com Rocks! Posts: 180 fort myers fl	Re: does anyone Reply #12 - 03/05/15 at 20:57:17 ok,so what is the most likely part's to go bad, float getting heavy,seat and valve assembly or o ring or other ? i think the height setting was ok as it only started leaking today. thanks to all . any help needed on aircraft please ask,hotprops.
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Dave

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Re: does anyone
Reply #13 - 03/06/15 at 03:14:53

hotprops wrote on 03/05/15 at 20:57:17:

ok,so what is the most likely part's to go bad, float getting heavy,seat and valve assembly or o ring or other ?

You will just have to take it apart and see. I have seen posts on this thread that have had bad floats that were leaking fuel inside, some with sticky hinges or needles. I took one apart where the ethanol had started to corrode the aluminum part of the needle and the white fuzz had pushed the rubber tip crooked.

To access the little screen above the seat, you need to remove the screw and clip and then pull the brass seat out of the float body. On one carb I did I needed a new O-ring there...as the original was in poor shape.

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youzguyz Serious Thumper Offline Posts: 2538 San Antonio, Texas Gender:	Re: does anyone Reply #14 - 03/06/15 at 03:35:16 Buy a carb rebuild/repair kit: http://www.ebay.com/sch/i.html?_odkw=suzuki+%28savage%2C+ls650%2C+s40%29+floa... It comes with the everything you would probably need to fix the leak. Float valve, float seat, o-rings
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