SuzukiSavage.com - tuning - possible damage?

Built2Last

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tuning - possible damage?
06/04/12 at 17:55:26

Due to the mods I've done, I have my idle finger screw screwed all the way in, and my idle mixture screw about half a turn out (maybe a full turn), and its at an almost steady 1,200 rpms. Could this be too rich? Would this cause engine damage on the highway? There's no black or white smoke... what is the rpm redline and stock idle mixture screw settings for a S40?

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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28644 Tucson Az Gender:	Re: tuning - possible damage? Reply #1 - 06/04/12 at 18:18:20 What mods, and what jets?... sounds like too much pilot...
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Built2Last Serious Thumper Offline Tempt Fate Posts: 1447 FTF Gender:	Re: tuning - possible damage? Reply #2 - 06/04/12 at 18:22:01 Raask exhaust (bigger head pipe), big k&n cone on the carb boot, 60 pilot, 160 main, 3 #4 washers
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Built2Last Serious Thumper Offline Tempt Fate Posts: 1447 FTF Gender:	Re: tuning - possible damage? Reply #3 - 06/04/12 at 19:01:08 Seemed like the 55 pilot wasn't enough
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Built2Last Serious Thumper Offline Tempt Fate Posts: 1447 FTF Gender:	Re: tuning - possible damage? Reply #4 - 06/05/12 at 05:36:07 Bump - calling all engine pros before I break something from tinkering
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: tuning - possible damage? Reply #5 - 06/05/12 at 06:10:08 Youve got the idle screw on the left side,the shifter side, cranked all the way in? Whats the idle RPM?
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Built2Last

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Re: tuning - possible damage?
Reply #6 - 06/05/12 at 06:25:00

justin_o_guy2 wrote on 06/05/12 at 06:10:08:

Youve got the idle screw on the left side,the shifter side, cranked all the way in? Whats the idle RPM?

The left idle screw is jacked in all the way, the right side idle mixture screw is under a full turn out... idle rpms are almost a steady 1200 when hot, 1100 when warm (I can always lower the rpms and lose pull).. no crazy drops in rpms when idling, no smoke from the exhaust (white or black) while idling or riding... I might just drop the pilot and main back down to 55 and 155 since I don't know if its gonna run so hot it tears something up ;(

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spacepirates

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Re: tuning - possible damage?
Reply #7 - 06/05/12 at 08:25:24

Running rich causes the engine to run cooler. the downsides of overly rich running are reduced fuel economy and fouled plugs.

Running lean causes the engine to run hotter, which over time can burn holes in your head gasket (happened to me).

Heat at idle might be a concern, in which case you should drop the idle speed down to 1000, or don't sit for long.

I'm not an engine pro though, I'm just fairly sure these are the cases. There was an oil-war thread a while back that posted running temperatures of different oils. You could always take those values and measure what your bike is running to see if it is cool/hot. might give you peace of mind.

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Built2Last Serious Thumper Offline Tempt Fate Posts: 1447 FTF Gender:	Re: tuning - possible damage? Reply #8 - 06/05/12 at 08:33:11 I'm running T6 right now, idle screw all the way down and idle mixture screw 1 turn out would be rich right? I'm not worried about the spark plug, I just don't need any engine damage till I can get on a dynojet or rejet (old pilot and main are messed up by the mechanic I had before I had space to work).
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spacepirates

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Re: tuning - possible damage?
Reply #9 - 06/05/12 at 08:56:21

Built2Last wrote on 06/05/12 at 08:33:11:

I'm running T6 right now, idle screw all the way down and idle mixture screw 1 turn out would be rich right? I'm not worried about the spark plug, I just don't need any engine damage till I can get on a dynojet or rejet (old pilot and main are messed up by the mechanic I had before I had space to work).

I can't say with any certainty if that would be lean or rich. The easiest, most sure-fire way to know? Pull the spark plug. white = lean, tan = perfect, black/dark = rich.

What catches my eye as strange is the idle screw is in so far, but that might not be a strange thing, i don't recall.

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Serowbot

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OK.... so what's the
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Re: tuning - possible damage?
Reply #10 - 06/05/12 at 09:04:52

First,.. if you have to have the idle speed screw all the way in to run... That screw opens the throttle plate... and allows engine vacuum to pull fuel straight from the pilot jet.
This means that the idle circuit is not working. Look in the intake end of the carb and you will see some tiny holes in front of the throttle plate. These may be clogged. They should allow a small amount of fuel to be pulled without the throttle plate being opened at all...
I'd start by running thin wire and cleaning fluid through those.
When you get those cleared,.. you should be able to back off the idle speed screw...
The added fuel may then require that you reduce the pilot jet.
#60/ 160 is really big...

PS.. adding a dynojet will only add more complications.... If you get this jetting right, you really don't need one...

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bill67 Serious Thumper Offline old tired Posts: 8517 genoa city wisconsin Gender:	Re: tuning - possible damage? Reply #11 - 06/05/12 at 09:11:28 I would try some motorcycle oil in it first,To see what happens.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: tuning - possible damage? Reply #12 - 06/05/12 at 09:15:54 & running rich washes oil from cylinder walls & can ruin the rings
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Built2Last Serious Thumper Offline Tempt Fate Posts: 1447 FTF Gender:	Re: tuning - possible damage? Reply #13 - 06/05/12 at 11:05:49 Serow, i don't have to have the idle screw in all the way for it run, just to have it at a steady 1200rpm. I'm not getting the dynojet jet kit, I'm talking about running it on a dynojet machine then tuning
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Built2Last Serious Thumper Offline Tempt Fate Posts: 1447 FTF Gender:	Re: tuning - possible damage? Reply #14 - 06/05/12 at 11:11:08 bill67 wrote on 06/05/12 at 09:11:28: I would try some motorcycle oil in it first,To see what happens. I put motorcycle oil in my and it broke, so why on earth would I put it in my bike???
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