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Message started by hotprops on 03/05/15 at 11:48:33

Title: does anyone
Post by hotprops on 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

Title: Re: does anyone
Post by youzguyz on 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.

Title: Re: does anyone
Post by Dave 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.

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.

Title: Re: does anyone
Post by youzguyz on 03/05/15 at 12:47:27

112A2730212D36302B232E31420 wrote:

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

Title: Re: does anyone
Post by verslagen1 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.

Title: Re: does anyone
Post by hotprops on 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?

Title: Re: does anyone
Post by hotprops on 03/05/15 at 14:52:49

465542435C5157555E01300 wrote:

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 ?

Title: Re: does anyone
Post by verslagen1 on 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.

Title: Re: does anyone
Post by verslagen1 on 03/05/15 at 15:19:01

3F38232725382724570 wrote:

[quote author=465542435C5157555E01300 link=1425584913/0#4 date=1425590397]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 ?[/quote]

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.

Title: Re: does anyone
Post by hotprops on 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.

Title: Re: does anyone
Post by Steve H on 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.

Title: Re: does anyone
Post by hotprops on 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.

Title: Re: does anyone
Post by hotprops 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 ?

i think the height setting was ok as it only started leaking today. thanks to all .

any help needed on aircraft please ask,hotprops.

Title: Re: does anyone
Post by Dave on 03/06/15 at 03:14:53

6B6C7773716C7370030 wrote:

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.

Title: Re: does anyone
Post by youzguyz on 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+float&_from=R40&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.Xsuzuki+%28savage%2C+ls650%2C+s40%29+carb+kit.TRS0&_nkw=suzuki+%28savage%2C+ls650%2C+s40%29+carb+kit&ghostText=&_sacat=0

It comes with the everything you would probably need to fix the leak.
Float valve, float seat, o-rings

Title: Re: does anyone
Post by hotprops on 03/06/15 at 13:02:17

you guys have been great! so i am waiting for parts, raptor and that cheap k%l carb rebuild kit from amazon.
ronaires is 10 days out on the raptor petthing he sold something like 56 in the last 2 mos most probably going to savage guys!
is there a thread showing/ telling how to check viability of the float,sometimes they gain weight without any slosh .weight in grams would be good.
i will weigh mine and if it turns out good you will have that info.

Title: Re: does anyone
Post by Dave on 03/06/15 at 13:13:21

292E3531332E3132410 wrote:

Is there a thread showing/ telling how to check viability of the float,sometimes they gain weight without any slosh .weight in grams would be good.

No...I don't have anything that weighs grams. What have you been up to? :-?

I just shake the float.....and if it doesn't make any sloshing sounds, then I hold it under hot water and watch for bubbles. When the air expands as the float gets warm - it will blow bubbles if there is a bad seam or hole.

Title: Re: does anyone
Post by jcstokes on 03/06/15 at 13:19:25

Hotprops, the ones that gain weight without sloshing are generally made of a brown composition material that can age and get porous and then absorb fuel. Brass or hollow plastic floats won't do this, they will slosh.

Title: Re: does anyone
Post by hotprops on 03/07/15 at 09:59:26

i just happen to have a scale in my shop that i use all the time and it reads in grams .
used it last to balance 4 pistons to within 3 or four grams :)