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General Category >> Rubber Side Down! >> Weird thing happened with the S40...
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Message started by Flint on 06/22/16 at 18:37:56

Title: Weird thing happened with the S40...
Post by Flint on 06/22/16 at 18:37:56

A few days ago I was out riding with the kids. We had been hot rodding a bit with the bikes, 75-80 MPH, and I pulled over the S40 stalled when I went to idle. This has never happened before. It did it twice.

Is the idle mix rich or lean? It has been jetted and a Harley muff installed.

Title: Re: Weird thing happened with the S40...
Post by Dave on 06/22/16 at 18:57:21

Did you chop the throttle? Sometimes when if you close the throttle too quickly, and the idle speed is a bit low, the engine can stall.

If the trend continues...try bumping the idle speed up a bit.....and/or close the throttle a little slower.

Title: Re: Weird thing happened with the S40...
Post by Flint on 06/22/16 at 19:19:54

That is what I found strange about it. It has been over a year with the same jetting and idle speed. I always run premium gas with no ethanol.

I filled up again today with 100LL. Maybe a bit of gunk on the idle jets?

Title: Re: Weird thing happened with the S40...
Post by justin_o_guy2 on 06/22/16 at 19:26:57

I noticed mine died if I was $Seriously whoopin it and, Since I was Whooping it, I hadda Chop throttle quickly to get set up for a corner,

The thing that helped Me the most with the least hassle was Up the idle.

TEV, I can't remember, so, someone, fill in the gaps, please.

Title: Re: Weird thing happened with the S40...
Post by KennyG on 06/22/16 at 20:03:04

Flint,

If the Transient Enrichment Valve is dirty you can get the engine to stall when gearing down or coming into a stop.

Before you start cleaning the TEV, stuff some rags around the starter because if you drop any of the screws you will never find them again. While you are at it it would be a good time to replace the 3 M4 x 10MM screws with stainless steel Allen head screws, or at least plated Phillips head screws from Ace Hardware.

Hold your thumb on the cover while removing the screws as it is spring loaded.

It is easy to clean the TEV, after disassembly use soap and warm water to wash the rubber diaphragm.

While you are inside the TEV you will find a small orifice that you should blow some air through to make sure it isn't clogged. The little air tanks you can buy for cleaning computers will work if you don't have a compressor.

As Dave suggested speeding up the idle a little will help.

Kenny G

Title: Re: Weird thing happened with the S40...
Post by justin_o_guy2 on 06/22/16 at 20:21:08

Suzuki screws that Look like Phillips AREN'T.
JIS screwdriver or a Phillips with the tip ground off till the X fills up the slots.

Title: Re: Weird thing happened with the S40...
Post by Kris01 on 06/23/16 at 05:28:48

100LL isn't doing anything for you but making your wallet lighter. It doesn't improve performance on this bike nor does it clean the carb as some have said. This bike has 8.5:1 compression and only requires 87 octane. ;)

Title: Re: Weird thing happened with the S40...
Post by batman on 06/23/16 at 11:41:56

You didn't list changing to a raptor ,if you haven't ,running at high speeds you have very little vacuum to hold the stock diaphragm open and the fuel level in the carb bowl may have dropped.how old is your bike?

Title: Re: Weird thing happened with the S40...
Post by hotprops on 06/25/16 at 13:50:41

kris 100 low lead is more like 91 octane if measured using the cargas method. it is good as it has a ton of lead to cushion the valve seats. also it has zero alcohol and keeps the tank .carb and rubber stuff like new. :)

Title: Re: Weird thing happened with the S40...
Post by Kris01 on 06/26/16 at 10:09:56

Oh really? So it's not actually 100 octane? I never considered the lead aspect. I guess it's been so long since we could run leaded gas that I forgot the S40 has no cataclysmic perverter to get ruined. We can run leaded or unleaded.

Title: Re: Weird thing happened with the S40...
Post by Dave on 06/26/16 at 18:45:36

There was a period of time when I used Avgas in my chainsaws and yard equipment. I did this to avoid the ethanol. Avgas doesn't burn at the same fuel/air mix as pump gas, and it runs rich if you don't rejet to account for it. The WOT speed of my chainsaws would drop 1,000 rpm when switching to Avagas.....until the mixture screw was adjusted to get the correct fuel/air ratio. The E10 requires more fuel to mix with the air...and if you are jetted to run correctly with E10........the Avgas will result in a mix that is too rich.