SuzukiSavage.com - Carb mods for RYCA project

Gyrobob

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Carb mods for RYCA project
04/30/11 at 09:04:24

How should we mod the carbs?

While we are waiting for the rest of the RYCA stuff to show up, we're doing several "tidy-up" projects so the finished project will be more like a new bike than an eighth-of-a-century old Savage with some new pieces on it.

Soon I'm about to freshen up the carbs, so I want to do some of the frequently recommended mods I've read about here while they are apart.

The only engine mods as part of the RYCA project will be the RYCA exhaust and the K&N air filter.

I know that even if I were just rebuilding a carb for a stock LS650, I'd want to do the white spacer mod, and re-jet, but I'm hoping to take advantage of all the real-world experiences the SuzukiSavage.com community has in modding these carbs.

So,... how should I change around the carbs to work better with the new parts?
- What to do with the white spacer?
- What jets to use, main and otherwise?
- Take the cover off the idle jet and adjust it?
- Adjust any of the springs inside?
- What parts are normally replaced in a typical rebuild?

Hopefully, with your expert inputs, I can put together a basic list of things to do to the carbs to get them tuned more for the new filter and exhaust, and to correct for the overly-lean tuning of the stock setup.

Thanks much in advance,

Bob

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MotoBuddha Serious Thumper Offline Let's roll! Posts: 1416 Charlotte, NC	Re: Carb mods for RYCA project Reply #1 - 04/30/11 at 10:14:59 Ryca has a carb mod video up on YouTube. The kit includes a selection of jets, a couple of washers to replace the white spacer, and their tuning suggestions.
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Gyrobob Serious Thumper Offline Posers ain't motorcyclists Posts: 2571 Newnan, GA Gender:	Re: Carb mods for RYCA project Reply #2 - 04/30/11 at 22:12:10 oh
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Routy

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Re: Carb mods for RYCA project
Reply #3 - 05/01/11 at 07:12:16

I would not mod anything unless I had evidence that it needs modding, and then mod only the speed circuit that needs modding.

Contrary to popular belief, many of these bikes,.....even the later s-40s run fine stock as a clock.
Running a less restrictive filter, is not a reason to mod the carb.
Running a much more open exhaust may be a reason, unless you happen to be running in higher elevation.

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Rich
'07 S40 Blvd stocker, except drilled OEM exhaust and white spacer mod...1/2 (.055)

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MotoBuddha Serious Thumper Offline Let's roll! Posts: 1416 Charlotte, NC	Re: Carb mods for RYCA project Reply #4 - 05/01/11 at 07:26:34 Evidence? The fact the exhaust turns blue is evidence it's running too lean. The popping on deceleration is evidence it's running too lean. EPA regulations are evidence the bikes are intentionally set up very lean.
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Routy

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Re: Carb mods for RYCA project
Reply #5 - 05/01/11 at 08:02:23

MotoBuddha wrote on 05/01/11 at 07:26:34:

Evidence?

The fact the exhaust turns blue is evidence it's running too lean.

The popping on deceleration is evidence it's running too lean.

EPA regulations are evidence the bikes are intentionally set up very lean.

The FACT still is,
Quote: Contrary to popular belief, many of these bikes,.....even the later s-40s run fine stock as a clock.

If you think pipe blueing is proof its running lean, you are wrong ! Just the residue from some types of cleaners can cause severe blueing, not to speak of the quality of some chrome.

You also seem to think that all carbs are identical,...wrong again.

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Rich
'07 S40 Blvd stocker, except drilled OEM exhaust and white spacer mod...1/2 (.055)

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bill67 Serious Thumper Offline old tired Posts: 8517 genoa city wisconsin Gender:	Re: Carb mods for RYCA project Reply #6 - 05/01/11 at 08:34:18 All carbs from the factories have been lean for the last 25 years or so,Go up one size richer jet on the high and low jets even if everything else is stock.
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Gyrobob

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Re: Carb mods for RYCA project
Reply #7 - 05/01/11 at 15:27:46

Routy, I'm not sure the filter supplied by RYCA is less restrictive. If you check out the analyses done by folks other than those interested in selling K&N stuff, the issue is at least up for debate.

I am fairly convinced, however, that usually the bikes come from the factory on the lean side; and that the factory exhaust is significantly more restrictive than the shorty megaphone supplied by RYCA.

So, I can see the value in going to richer mixtures in incremental steps. I suppose I'll use the jets supplied by RYCA as a starting point (and hopefully an ending point).

On a related subject, I noted when I tried to find carb rebuild kits on the internet, they were available for 1986-2001, but nothing mentioned for 2002. My partner in this RYCA project has a 2000, but mine is a 2002.

Did something in the carb change in 2001?

Where do I find a carb rebuild kit (o-rings, float valve, gasket etc.) for a 2002?

Thanks

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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: Carb mods for RYCA project Reply #8 - 05/01/11 at 15:45:01 other than main and pilot, there are several jets in the carb that we don't mess with. Those have changed over the years. Most mfr's will not certify that it fits unless they've checked it out. Other than that, all year carbs are the same.
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verslagen1

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Re: Carb mods for RYCA project
Reply #9 - 05/01/11 at 16:12:46

Routy wrote on 05/01/11 at 08:02:23:

MotoBuddha wrote on 05/01/11 at 07:26:34:

Evidence?

The fact the exhaust turns blue is evidence it's running too lean.
The popping on deceleration is evidence it's running too lean.
EPA regulations are evidence the bikes are intentionally set up very lean.

The FACT still is,
Quote: Contrary to popular belief, many of these bikes,.....even the later s-40s run fine stock as a clock.
If you think pipe blueing is proof its running lean, you are wrong ! Just the residue from some types of cleaners can cause severe blueing, not to speak of the quality of some chrome.
You also seem to think that all carbs are identical,...wrong again.

True some stock bikes run fine, just as true, some do not.
There's at least 1 story of the owner pulling the plug to find that the idle mixture screw was turned all the way in. And we all know that adjusting it can be difficult.
Add in mfg tolerances and blue mondays and you get brand new savages that kerpow from day 1.
And MB is talking about overheat blueing and you know that. You don't have to get high and mighty to expand on it. Overheat blueing is a pretty serious issue. Besides requiring a lot of elbow grease and blue job to fix, it can burn the pistons and valves leading to premature death of the savage.
Personally I do kinda wince when it is suggested that to go up to a 55 and 155 jets w/o any testing beforehand, but they have the experience with the actual components involved. Just hope the written instructions are clear enough to show when leaner jets are needed.

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Routy

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Re: Carb mods for RYCA project
Reply #10 - 05/01/11 at 19:31:04

Quote:
And MB is talking about overheat blueing and you know that.
---------------------------------------------------------------------
I do ?
If a header is blueing from combustion chamber overheating, the plug will show it.
IMO,......have evidence, like bad running, or bad plug read before hacking a carb. It could keep the less exerienced out of a ot of trouble.
Others opinions may differ.

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Rich
'07 S40 Blvd stocker, except drilled OEM exhaust and white spacer mod...1/2 (.055)

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