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Old 04-25-2010, 09:58 AM   #1
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my sh .28 c use to idle forever now it wnt idle more than a few secondsthe hobby shop told me the nitro motors are not made to idle more than a few seconds
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Old 04-25-2010, 10:06 AM   #2
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I was told when tuning the low end of an engine you should have the LSN and the idle screw set so that it can hold a strong idle for at least 20 seconds. Maybe your engine lost its tune just a bit. But it should idle as far as im concerned for more then a few seconds.
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Old 04-25-2010, 10:15 AM   #3
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I was told when tuning the low end of an engine you should have the LSN and the idle screw set so that it can hold a strong idle for at least 20 seconds. Maybe your engine lost its tune just a bit. But it should idle as far as im concerned for more then a few seconds.
i havent messed with lsn only hsn and idle so if i turn my idle up what will i need to do with my lsn and if i touch my lsn will i need to richen or lean my hsn
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Old 04-25-2010, 10:21 AM   #4
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Is the motor fairly new? If so, it could've of richened up from "breaking in". Try leaning the LSN then u may have to turn the idle down some too.
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Old 04-25-2010, 10:25 AM   #5
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they should definitley idle for more then a couple seconds. About 30 is average.



on second thought it depends. Because after about 10 or 15 i blip the throtle.

i guess it all depends.
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Old 04-25-2010, 11:22 AM   #6
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Is the motor fairly new? If so, it could've of richened up from "breaking in". Try leaning the LSN then u may have to turn the idle down some too.
got the motor from a friend had 6 races on it
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Old 04-25-2010, 11:24 AM   #7
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they should definitley idle for more then a couple seconds. About 30 is average.



on second thought it depends. Because after about 10 or 15 i blip the throtle.

i guess it all depends.
what should i try leaning the lsn and lowering the idle and is it the same for lsn and hsn clockwise lean counter richen
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Old 04-25-2010, 11:33 AM   #8
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Well if your motor is putting out a lot of smoke with you take off it could your lsn is to fat try to lean it about an hour at a time until if feels good then adjust your idle from there. If the bottom feels fine then just adjust your idle a bit until it stays running.
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Old 04-25-2010, 01:40 PM   #9
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what should i try leaning the lsn and lowering the idle and is it the same for lsn and hsn clockwise lean counter richen
Your LHS is wrong.. They should idle and idle and idle.. Go to the track on an off day and ask someone for some help, or if you know a few of the better racers ask them for a little help.. They can see what your engine is doing and give you a better analysis of what it needs.. If they tune it for you ask them what they did and why..

I've had guys tune for me before, only to be left wondering why did he do that? It rocks, but why? What did he see that I didn't. ETC ETC..

Your idle is too low, too rich on LSN, or too Lean.. It can be any of those.. Do the pinch test.. Get it running and Pinch the fuel line as close to the carb as possible. If it revs up before 3 seconds then it is too lean. IF it takes longer than 5 seconds it is too rich.. Also, if it revs right at 3-4 seconds, then it is about right and you need to raise the Idle speed..
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Old 04-25-2010, 02:44 PM   #10
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Read it, learn it, and live it..
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Old 04-25-2010, 03:03 PM   #11
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AGREED!.
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Old 04-25-2010, 03:23 PM   #12
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Your LHS is wrong.. They should idle and idle and idle.. Go to the track on an off day and ask someone for some help, or if you know a few of the better racers ask them for a little help.. They can see what your engine is doing and give you a better analysis of what it needs.. If they tune it for you ask them what they did and why..

I've had guys tune for me before, only to be left wondering why did he do that? It rocks, but why? What did he see that I didn't. ETC ETC..

Your idle is too low, too rich on LSN, or too Lean.. It can be any of those.. Do the pinch test.. Get it running and Pinch the fuel line as close to the carb as possible. If it revs up before 3 seconds then it is too lean. IF it takes longer than 5 seconds it is too rich.. Also, if it revs right at 3-4 seconds, then it is about right and you need to raise the Idle speed..
very true, should idle for ever mine do, i dile mine at least 3 to 4 minutes at the begining of the day, tell ur hobby to get into a new perfession if he told u this
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Old 04-25-2010, 05:44 PM   #13
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Your LHS is wrong.. They should idle and idle and idle.. Go to the track on an off day and ask someone for some help, or if you know a few of the better racers ask them for a little help.. They can see what your engine is doing and give you a better analysis of what it needs.. If they tune it for you ask them what they did and why..

I've had guys tune for me before, only to be left wondering why did he do that? It rocks, but why? What did he see that I didn't. ETC ETC..

Your idle is too low, too rich on LSN, or too Lean.. It can be any of those.. Do the pinch test.. Get it running and Pinch the fuel line as close to the carb as possible. If it revs up before 3 seconds then it is too lean. IF it takes longer than 5 seconds it is too rich.. Also, if it revs right at 3-4 seconds, then it is about right and you need to raise the Idle speed..
i went to the track today and did exactly that it was brain wrenching to pack in so much info from so many people at once took a few hours cause everyone was racing but we got it squared away
THANKS TO ALL UR HELP AGAIN EVERYONE
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Old 04-25-2010, 10:17 PM   #14
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i went to the track today and did exactly that it was brain wrenching to pack in so much info from so many people at once took a few hours cause everyone was racing but we got it squared away
THANKS TO ALL UR HELP AGAIN EVERYONE
Awesome gald I could help.. Just try to stick to one set of rules for tuning.. KISS method.. Keep It Simple Stupid.. Look at the obvious stuff if it won't tune in the future..

Enjoy!
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