SuzukiSavage.com - Soliciting Paid Assistance

Bokobob

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Soliciting Paid Assistance
04/04/20 at 08:18:11

Me? In eighties and brain dead with wrenching.

My very nice 2009 S40 Thumper runs well, but it starts hard when engine is cold, and there is a nearly imperceptible (choose a word: stuttering, slight hesitation that comes and goes, "stumbling" a tiny bit) when riding above 40 mph or so. It seems to me like it is getting the gas very slightly unevenly. It may be doing it in all gears at all speeds, but I do not pay that much attention when accelerating from a stop light up to 4th and 5th gears because my attention is on getting up to highway speed. The phenomenon mentioned is constant...It kind of flutters, but again, almost imperceptibly...

Starting hard seems to be that I have to fidget with the choke until the engine "catches" well. Once started and running generally ok, I keep the choke to medium and keep the throttle partly open until I have gone a mile or so when starting out with a cold start.

I note there are quite a few members of the Savage forum in North Carolina, and of these a good number are in the vicinity of Charlotte, NC...I live 20 miles west of Charlotte in Gastonia NC..
I wonder if anyone with expertise and within a reasonable would be willing to assist me in replacing the carburetor? (either that or rehabbing the one installed.). I will pay generously for competent help.

Alternatively, if you know of a good and trustworthy mechanic in the greater Charlotte area (radius of 50 miles or so) that you recommend, please do so.

I am thinking of replacing carb with the top-rated one in the recent posting about "carburetor shootout" in which the author tried out four different carbs on his thumper.

Thank you.

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« Last Edit: 04/04/20 at 16:07:59 by Bokobob »

Bob
84 and still riding
2009 S40 650, and Rebel 250
Gastonia, NC

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SoC

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New Jersey
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Re: Soliciting Paid Assistance
Reply #1 - 04/04/20 at 08:39:43

Bokobob, To answer your second question of day, before messing with the carb, replace the original petcock in gas tank with one for a Yamaha Raptor. Buy an original OEM from a Yamaha dealer, not a cheap knock-off from online. Many of the issues you describe can be attributed to the vacuum problems that can occur with the original petcocks when they get older.

The install of the raptor unit is a straight up fit, just unbolt the original and put in the new one. You remove the vacuum hose for the original and plug the inlet for it on carb with a screw protector from the hardware store.

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28890 L.A. California Gender:	Re: Soliciting Paid Assistance Reply #2 - 04/04/20 at 08:44:17 try a new sparkplug.
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LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10668 Oklahoma Gender:	Re: Soliciting Paid Assistance Reply #3 - 04/04/20 at 09:58:56 verslagen1 wrote on 04/04/20 at 08:44:17: try a new sparkplug. I have found this helpful from time to time. 😏
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Bokobob Junior Member Offline SuzukiSavage.com Rocks! Posts: 96 Gastonia, NC Gender:	Re: Soliciting Paid Assistance Reply #4 - 04/04/20 at 10:02:15 Thank you all. I will order the OEM petcock and put in a new spark plug. I am already using seafoam in the gas tank regularly... Stay tuned.. [edit] Edit: I will order the Yamaha Raptor petcock as suggested...There is a part number somewhere in forum..I'll hunt it down so I get the right one..
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justin_o_guy2

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Re: Soliciting Paid Assistance
Reply #5 - 04/04/20 at 10:06:38

Starting with the cheapest, easiest problem to solve is a great plan.
The petcock is a common issue, thirty bux,, ish. Not even physically challenging for old crippled up guys like me.
Spilling some Sea Foam in the tank is easy and MIGHT change the way things are.. Low odds, but If it helps,, its so cheap and easy, I think its worth tryine first.

Just saw your last post,, scratch my Sea Foam suggestion.
OEM petcock Is the weak link.
Yamaha Raptor is what most of us use. Genuine Yamaha part,,

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The people never give up their liberties but under some delusion.- Edmund Burke.

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Gary_in_NJ

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Re: Soliciting Paid Assistance
Reply #6 - 04/04/20 at 10:12:38

Bokobob wrote on 04/04/20 at 10:02:15:
Thank you all. I will order the OEM petcock and put in a new spark plug.

To be clear, you DONT want to order an OEM peacock, you want to order an OEM Yamaha Raptor Petcock.

Sparkplug, sure why not. Seafoam, sure why not. But the problem you are describing is lean surge and that can be fixed only by cleaning the inside of the carb and most likely raising the needle.

Can someone help this 80 year young man out?

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justin_o_guy2

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Re: Soliciting Paid Assistance
Reply #7 - 04/04/20 at 10:27:27

If I was one of the sites carb Guru types I just might be willing to do the carb on my bench after UPS dropped it off to me..But before we go that way,, lets try the petcock.. Heck, Put your petcock on Prime and see if it runs better.. That bypasses the vacuum diaphragm.
Also, petcock failures Sometimes allow fuel to get in the oil.
If youre seeing more oil when you check it,, you may not be hallucinating.

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The people never give up their liberties but under some delusion.- Edmund Burke.

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jcstokes Serious Thumper Offline SuzukiSavage.com is very useful Posts: 2119 Mauku New Zealand Gender:	Re: Soliciting Paid Assistance Reply #8 - 04/04/20 at 11:26:47 Do you crack the throttle open when you start?
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zipidachimp

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Re: Soliciting Paid Assistance
Reply #9 - 04/04/20 at 11:46:27

Boko: there is order in the universe and it is this for S40 owners:
1..Yamaha Raptor petcock replacement
2..Cap the vacuum port on the carb
3..White spacer mod on carb
4..Re-jet the carb 52.5/150 and test
5..Shell Rotella 15w/40 oil
6..Fresh rubber, not from 2009
7..Ride the darn thing !
From a 76 yr old with a few grey cells and an inquiring mind/sense of adventure
Cheers! Cool

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IslandRoad Serious Thumper Offline It doesn't vibrate, it purrs! Posts: 1147 The Kiewa Valley, Australia Gender:	Re: Soliciting Paid Assistance Reply #10 - 04/04/20 at 13:24:22 Tis is the Yamaha part number for the petcock: 5LP-24500-01-00
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Bokobob

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Re: Soliciting Paid Assistance
Reply #11 - 04/04/20 at 13:27:34

Quote: Do you crack the throttle when you start?

Not sure what you mean. When I first start the bike or when I start from a stoplight? If when I first start the bike up cold, I use the throttle a bit to "help" coax the engine to run smoother; if from a stoplight, I ride very easy going.

I am gonna go for a ride in a moment...I will try the petcock on "prime" after it warms up.

I will also rev the engine up after the ride when in neutral and stopped to see if I can tell any difference...

Also thank you for the part number...…

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Bob
84 and still riding
2009 S40 650, and Rebel 250
Gastonia, NC

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bobert_FSO Senior Member Offline SuzukiSavage.com Rocks! Posts: 422 Wichita KS Gender:	Re: Soliciting Paid Assistance Reply #12 - 04/04/20 at 13:52:42 My suggestions would be issues with either the petcock or the carb white spacer mod. Modifying the needle spacer really made a difference for me.
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jcstokes Serious Thumper Offline SuzukiSavage.com is very useful Posts: 2119 Mauku New Zealand Gender:	Re: Soliciting Paid Assistance Reply #13 - 04/04/20 at 13:53:04 According to the handbook cold starts should be done with full choke and completely closed throttle.
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srinath Serious Thumper Offline I love YaBB 1G - SP1! Posts: 5349	Re: Soliciting Paid Assistance Reply #14 - 04/04/20 at 14:30:22 You have clean carbs ? Cool. Srinath.
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