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reasons for timing advance

This is a discussion on reasons for timing advance within the Yamaha YFZ350 Banshee (1987-Present) forums, part of the Performance /Technical category; hi my banshee came with a pro design timing plate it was set on +4 what are the benefits from different timings? anything 'type of ...


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Old 09-09-2003, 01:10 AM   #1
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Default reasons for timing advance

hi
my banshee came with a pro design timing plate
it was set on +4

what are the benefits from different timings?
anything 'type of riding' specific?
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Old 09-09-2003, 03:09 AM   #2
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what else is done on your motor??? Timing is usually set for a specific motor setup, I.E. compression ratio or type of fuel.
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Old 09-09-2003, 08:52 AM   #3
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the head was shaved very little
and the engine has mild porting
thats about it, except exhaust
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Old 09-09-2003, 10:26 AM   #4
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well timing advancing gives you about 2hp through the whole power band.. goes really well with a milled head..
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Old 09-09-2003, 04:45 PM   #5
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I was wondering this too I have heard that advancing the timing can actually hurt the engine?
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Old 09-09-2003, 04:57 PM   #6
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i guess my inquiring mind wants to know like, on a scale, what timing would be good for what.

example:
+1 - good for blah
+2 - good for bleh
+3 - good for bloh
+4 - good for bluh

i just changed stators and it came with a timing place and i just put it back to stock timing because i have never actually seen how my banshee performs at stock timing.
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Old 09-09-2003, 05:10 PM   #7
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IMO its worth it
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Old 09-09-2003, 05:12 PM   #8
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well i gotta close everything back up and try it out this evening
i'll find out pretty quick if its noticeable or not i guess
i'll report back with my findings
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Old 09-09-2003, 08:38 PM   #9
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I haven't been here in forever, and I sold my ATV a little while ago but I figured I would chime in:

Timing is basically when the engine will get its fuel and let out it's exhaust (in your car it is done through a series of valves for instance) however it can lead to knock and detonation... so if you have low octane gas it is a bad idea, but high octane gas is a good idea. Timing is power, just make sure you don't have too much advance or you will be pushing things too hard and that leads to pain in the engine.
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Old 09-09-2003, 08:54 PM   #10
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well i know what changing the timing physically does, just not what its benefits are.

the stroke is still exactly the same, as far as getting the fuel and letting out the exhaust.

what changing the timing actually does is alter when the spark plug fires within the stroke... (earlier or later)
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Old 10-08-2003, 08:27 PM   #11
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Quote: Originally Posted by jilted
well i know what changing the timing physically does, just not what its benefits are.

the stroke is still exactly the same, as far as getting the fuel and letting out the exhaust.

what changing the timing actually does is alter when the spark plug fires within the stroke... (earlier or later)
I was just looking through some of the old posts and this one caught my eye.

Advancing your ignition timing gives the air/fuel mixture more time to burn. Since the heat is what causes the piston to move down and not the explosion, this means more of the fuel will be used up to heat the oxygen to push the piston down harder.
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Old 10-08-2003, 09:12 PM   #12
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I "think" it also makes you more likely to ping if you dont have enough octane and it makes a motor run hotter.
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Old 10-08-2003, 11:51 PM   #13
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First +4 or +5 max is about as far as you want to go for a normal engine.

By advancing the timing you are igniting the air/fuel mixture a little sooner. How does this give more power? It takes time for fuel to burn so the spark always fires before the piston reaches TDC. In other words, the spark fires before the piston is finished with the compression stroke. What this does is gets the air/fuel mixture burning and close to maximum combustion pressure at just the right time. If it fires too late you lose power and if it fires too soon you get pre-ignition. In short, by advancing the timing you are just firing at a more optimal time than stock. The stock curve is a little conservative I guess.
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Old 10-09-2003, 12:44 AM   #14
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I 2nd what WyoDuner said! When I advanced my timing to +4 to +5 and ran race fuel...it felt like 10 more HP, but I know it is only about 2HP.
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Old 10-10-2003, 02:28 PM   #15
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ok here is a very simple explanation
when at idle if advanced it will sound like its idling rougher / higher or like your giving it a little gas but your not
so it seems to get to power faster
make sense
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