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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> tuning - possible damage? /cgi-bin/YaBB.pl?num=1338857727 Message started by built2last66 on 06/04/12 at 17:55:26 |
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Title: tuning - possible damage? Post by built2last66 on 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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Title: Re: tuning - possible damage? Post by Serowbot on 06/04/12 at 18:18:20 What mods, and what jets?... sounds like too much pilot... |
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Title: Re: tuning - possible damage? Post by built2last66 on 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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Title: Re: tuning - possible damage? Post by built2last66 on 06/04/12 at 19:01:08 Seemed like the 55 pilot wasn't enough |
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Title: Re: tuning - possible damage? Post by built2last66 on 06/05/12 at 05:36:07 Bump - calling all engine pros before I break something from tinkering :D |
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Title: Re: tuning - possible damage? Post by justin_o_guy2 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? |
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Title: Re: tuning - possible damage? Post by built2last66 on 06/05/12 at 06:25:00 7C6365627F7849794971636F24160 wrote:
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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Title: Re: tuning - possible damage? Post by spacepirates on 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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Title: Re: tuning - possible damage? Post by built2last66 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). |
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Title: Re: tuning - possible damage? Post by spacepirates on 06/05/12 at 08:56:21 3A2D31342C6A34392B2C6E6E580 wrote:
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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Title: Re: tuning - possible damage? Post by Serowbot on 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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Title: Re: tuning - possible damage? Post by bill67 on 06/05/12 at 09:11:28 I would try some motorcycle oil in it first,To see what happens. |
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Title: Re: tuning - possible damage? Post by justin_o_guy2 on 06/05/12 at 09:15:54 & running rich washes oil from cylinder walls & can ruin the rings |
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Title: Re: tuning - possible damage? Post by built2last66 on 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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Title: Re: tuning - possible damage? Post by built2last66 on 06/05/12 at 11:11:08 383336366C6D5A0 wrote:
I put motorcycle oil in my and it broke, so why on earth would I put it in my bike??? |
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Title: Re: tuning - possible damage? Post by Serowbot on 06/05/12 at 11:26:29 That's a "dynamometer", more specifically a chassis dynamometer (Dyno,for short)... not a dynojet... (dynojet, is a contraption that connects to your carb)... ;)... Anyway,.. I still think the idle passages are clogged... |
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Title: Re: tuning - possible damage? Post by built2last66 on 06/05/12 at 12:04:53 Ok dyno then... I have a few other things to check, can't you adjust the throttle cable. To give the idle screw more slack? I'm on an 8hr long rd trip and not near my bike.. |
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Title: Re: tuning - possible damage? Post by Serowbot on 06/05/12 at 13:13:50 75627E7B63257B7664632121170 wrote:
You can check that you have slack in the cable,.. but, the limiting point, off-throttle. is the throttle plate inside the carb , idle speed screw is just barely nudging it open, there should still be slack in the cable... Good luck... ;)... |
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Title: Re: tuning - possible damage? Post by built2last66 on 06/13/12 at 19:33:34 I figured out the problem - let the bike warm up for about 15 minutes then tune :D |
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Title: Re: tuning - possible damage? Post by Routy on 06/14/12 at 06:37:46 3C2B37322A6C323F2D2A68685E0 wrote:
I think you have bigger problems than that. Like Sero says, it seems the idle circuit is not working, so you are compensating for that by opening the throttle plate to hold idle R's. And are you talking about rich/lean on idle ? Don't wory about that, because if the idle is not very near the correct mixture, it won't idle. Any engine damage is going to come only from a heavy load at higher speeds while running lean. From what you describe on your idle settings, are you getting anything close to a quality idle ? There is more to a normal good idle than just rpms. |
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Title: Re: tuning - possible damage? Post by built2last66 on 06/14/12 at 07:31:16 I'm just trying to make it idle at a steady 1,100 rpm, and to do this I have to crank the idle screw in all the way.. not the idle mixture screw.. I'm not using stock jets, exhaust, air cleaner, or needle spacer.. so it's pretty modified on the carb end of things.. |
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Title: Re: tuning - possible damage? Post by justin_o_guy2 on 06/14/12 at 07:47:55 it's pretty modified on the carb end of things.. Its also messed up on the carb end of things. No way should the idle screw be in like that. Youre gonna hafta go in & clean it, |
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Title: Re: tuning - possible damage? Post by built2last66 on 06/14/12 at 13:48:21 47585E5944437242724A58541F2D0 wrote:
Took it apart, no gunk.. wire brushed it.. CRC carb cleaned it.. I use SeaFoam regularly.. it's not dirty at all.... |
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Title: Re: tuning - possible damage? Post by justin_o_guy2 on 06/14/12 at 16:08:45 Somethin aint right,,or you wouldnt need to crank the idle like that, |
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Title: Re: tuning - possible damage? Post by built2last66 on 06/14/12 at 16:11:45 2D3234332E2918281820323E75470 wrote:
My sickles too hot rodded :( SUCK BANG BLOW is my engine... the stock is suck bang blow.. |
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