+4 timing etc...

[714banshee380]

Can someone explain to me in the easiest way to understand how retarding the timing helps the motor??

[xXBlessedWithDeathXx]

I`m also interested. i cant see how it would help but if it didnt why do they put the retard notches in after market plates. hahaha i get it. you have to be retarded to retard the shee timing.

 

Now, if i can only figure out how to pass off cheerios as donuts seeds on ebay. :shoothead:

[bink98xcab]

i think they have that adjustment for NOS< or turbos maybe, thats all i could thnk of

[bink98xcab]

or did you mean advance timing, i just seen the +4 in your title.

[gregrob]

Retarding it can help it on the top end, it will kill the bottom but make it pull on top. The stock box does that already, advances on the bottom and pulls out timing on the top, but you can take it even further by retarding it on the plate.

 

 

A Dyna FS programmable is ultimate if you really want to take advantage of that though, IMO.

[714banshee380]

or did you mean advance timing, i just seen the +4 in your title.

 

 

advance.... my bad

[Wildcardracing]

Advancing your timing ignites your air/fuel mixture sooner in the stroke, thus changing the time at which the strongest part of the explosion hapens in the crankshaft rotation. This will show an improvement in the bottom end power but a very slight decrease on top. Too much timing will cause pre-ignition, thus increasing your octane requirements. Both the pros and cons of timing adavance are very similar to increased compression.

[714banshee380]

Advancing your timing ignites your air/fuel mixture sooner in the stroke, thus changing the time at which the strongest part of the explosion hapens in the crankshaft rotation. This will show an improvement in the bottom end power but a very slight decrease on top. Too much timing will cause pre-ignition, thus increasing your octane requirements. Both the pros and cons of timing adavance are very similar to increased compression.

 

 

 

well the guy who built my bike finished it last season so we took it out and it wouldnt start.... it was getting spark, had gas, carbs clean, coild fine, compression fine then he said he had to advance the timing and it run. and what do you know that worked. well now i have been having some overheating issues and i was just curious if the timing had anything to do with it???

[Wildcardracing]

Sure, advanced timing will cause the engine to run hotter. Too much and you can overheat if you're not running enough octane. As with compression, the more timing you run... the more octane you need.

[714banshee380]

Sure, advanced timing will cause the engine to run hotter. Too much and you can overheat if you're not running enough octane. As with compression, the more timing you run... the more octane you need.

 

i currently run a 50/50 mix with F&L 112 octane and 91 premium with a 40:1 ratio

 

so you recomend i run straight racefuel???

 

leaded unleaded???

Edited March 19, 2008 by 714banshee380

[714banshee380]

.....

[Washburn]

i currently run a 50/50 mix with F&L 112 octane and 91 premium with a 40:1 ratio

 

so you recomend i run straight racefuel???

 

leaded unleaded???

 

 

It depends on how much you advance your timing and how much compression your running now. 150-165 I think 110/93 50/50 will be enough 165 and above I would run straight race fuel. Leaded fuels acyualy are better for a 2 stroke engine adding a little more lube and most higher octane race fuels like VP are leaded.

[David Keith]

Advancing your timing ignites your air/fuel mixture sooner in the stroke, thus changing the time at which the strongest part of the explosion hapens in the crankshaft rotation. This will show an improvement in the bottom end power but a very slight decrease on top. Too much timing will cause pre-ignition, thus increasing your octane requirements. Both the pros and cons of timing adavance are very similar to increased compression.

That's right, and the higher octane fuel explodes "slower", but with more driving force.

[714banshee380]

how would i check compression? do i need to buy a spedial tool

[Face]

You need a compression tester. they are not too expencive.