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2007 S40 - Carb Questions (Read 78 times)
irobb
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2007 S40 - Carb Questions
11/24/22 at 07:32:35
 
Hi All,

Happy Thanksgiving. New member here. I did search first but there's so many posts about my specific question below.

I recently got an 07 S40 and it pops and cracks each deceleration and seems to not be able to accelerate under full throttle, while continuing to backfire and pop.

Based on the parts diagram I found online, it looks like the OEM carb for my year LS650 K7 carb PN 13200-24CA0 was replaced by PN 13200-24C91.

However, the carb is near $500 as of this post.

I tried fiddling with the idle screw mixture on the right side (the one you have to drill out) as well as following the guides to stop the backfiring.

I think the previous owner might have messed with the spacers or jets inside.

Sorry so long, just giving context first.

My question is, since the idle screw mixture isn't working for me, are there jet kits that anyone can recommend that I try? I would also take the opportunity to clean the carb if I need to remove it.

There are no exhaust leaks.

Anyone have any suggestions? I'd like to do this myself and not bring it into a shop.

Happy Thanksgiving!  Thanks in advance.  Smiley
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justin_o_guy2
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Re: 2007 S40 - Carb Questions
Reply #1 - 11/24/22 at 07:57:45
 
If it was parked for months the carb might just be nasty. The gas should be replaced, the petcock should be on prime to make sure it's delivering. You can prove fuel flow by letting it drain gas into a can. You can drain the carb bowl, to make sure it's getting filled, catch it in a clear cup. Have a look at what comes out. If you can drop the bowl you can eyeball in there and run a wire through the jets.

Is this why the guy sold it? Did he swap out the carburetor and never got it to run right?


You need to prove your fuel flow all the way into the bowl.
The petcock is old and they are the source of much aggravation .
So put it on Prime and check it for flow.
If still no joy
Drop the bowl and see what jets are in it and are they crusty?
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Re: 2007 S40 - Carb Questions
Reply #2 - 11/24/22 at 08:12:08
 
Quote:
Based on the parts diagram I found online, it looks like the OEM carb for my year LS650 K7 carb PN 13200-24CA0 was replaced by PN 13200-24C91.


That's usual notation for all parts, the part issued with the year vs. the current part.

Quote:
My question is, since the idle screw mixture isn't working for me, are there jet kits that anyone can recommend that I try? I would also take the opportunity to clean the carb if I need to remove it.


Generally, if adjusting the idle mixture screw doesn't do anything then the idle jet is too large, go down 1 size.

Quote:
I recently got an 07 S40 and it pops and cracks each deceleration and seems to not be able to accelerate under full throttle, while continuing to backfire and pop.


I would say that many problems can be a dirty carb or a bad petcock, so that would be the 1st thing I would do.  And while you're in there, note what jets you have.
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Re: 2007 S40 - Carb Questions
Reply #3 - 11/24/22 at 16:56:22
 
Start with the petcock. And, don't overlook a sticky slide.  It will present as a very lean condition with a lack of acceleration.
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Re: 2007 S40 - Carb Questions
Reply #4 - 11/25/22 at 08:57:12
 
Hi All,

I changed the petcock when I got it and also fresh gas and oil change...

I think I should just remove the car, clean fully, inspect, and determine what jets are in it.

Then, based on the jets, order a new set that comes with varying sizes...  

So, is there a good site folks like to use, other than Amazon, to order carb parts for our S40? I've ordered from revzilla before but am hoping there's something else?
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Re: 2007 S40 - Carb Questions
Reply #5 - 11/25/22 at 11:17:21
 
Replaced with the same vacuum petcock they come with?
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Re: 2007 S40 - Carb Questions
Reply #6 - 11/25/22 at 12:06:57
 
justin_o_guy2 wrote on 11/25/22 at 11:17:21:
Replaced with the same vacuum petcock they come with?


I replaced the petcock with this https://www.amazon.com/gp/product/B07DNRR4MB/ref=ppx_yo_dt_b_search_asin_titl...

Should I use a different one?
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Re: 2007 S40 - Carb Questions
Reply #7 - 11/25/22 at 13:03:56
 
You need to Prove your fuel flow.

Sharing what you have already done when asking for help is considered good form.

How did you handle the vacuum line?
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Re: 2007 S40 - Carb Questions
Reply #8 - 11/25/22 at 14:57:51
 
I replaced the petcock with this https://www.amazon.com/gp/product/B07DNRR4MB/ref=ppx_yo_dt_b_search_asin_titl...

Should I use a different one?


Yes.  You should buy a genuine Yamaha Raptor petcock.  Part number 5LP-24500-01-00.  That $11 unit is bogus.  If you are dead set on using the Amazon knock-off, verify that it flows at least 8 ounces per minute.  That should be sufficient to support 50 horsepower.

For main jets and pilot jets, I have always had good luck with Jets-R-Us.  You want Mikuni Large Round Main Jets N100.604, and Mikuni Pilot jets (no emulsion holes) N151.067.

https://www.jetsrus.com/a_jets_by_carburetor_type/a_jet_kits_mikuni_selection...

Of course, genuine Suzuki carburetor parts are always a safe bet.  You can purchase main jets and pilot jets through Suzuki dealers.

For all other stock carburetor parts (needle jet, slide, slide needle, float, float needle & seat, mixture screw, TEV diaphragm, etc.), buy genuine Suzuki parts.  The overhaul kits are sketchy at best.  They cause big problems that are very difficult to diagnose.  This post provides more info.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1641171298

Good luck.
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Re: 2007 S40 - Carb Questions
Reply #9 - 11/25/22 at 17:59:46
 
Thanks! I'm ordering the raptor right now. It'll be here Monday. I'll post my results.
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Re: 2007 S40 - Carb Questions
Reply #10 - 11/25/22 at 18:50:53
 
justin_o_guy2 wrote on 11/25/22 at 13:03:56:
You need to Prove your fuel flow.

Sharing what you have already done when asking for help is considered good form.

How did you handle the vacuum line?



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Re: 2007 S40 - Carb Questions
Reply #11 - Yesterday at 10:24:50
 
The petcock got here early by one day so I began draining the fuel from the tank by switching petcock to PRI.  No fuel came out other than when I had the petcock on PRI.

Regardless, I am ordering new jets, will clean the carb, replace the generic petcock with the good one (I hope it's the good one)...

Here's the petcock I ordered:

https://www.amazon.com/dp/B004K9I25C?psc=1&ref=ppx_yo2ov_dt_b_product_details
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Re: 2007 S40 - Carb Questions
Reply #12 - Yesterday at 12:39:53
 
Thanks for posting that, irobb.  It's interesting that Amazon indicates it's frequently bought with vacuum port caps  Wink
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