timing key or no??

[jminor1]

Running a 50 horse boondocker shot and thinking of putting in the 3 degree key, anybody have thoughts?

 

[NOS-PRO]

No need for it, unless you go real big.

 

[700SCOTT]

I'm running a 60 shot with the boondocker kit on mid grade fuel with out any problems with out retarding the timing. no problems

 

[jminor1]

700 scott I'm talking about a 3 degree advanced timing, also if you could pm me how your set-up works, its similar to mine but I am running 2 nozzles into k+n's and I think the max you can get is a 25 horse nozzle so I am guessing you are running 4 nozzles into the box??

 

[jminor1]

link.....I think
http://www.hauckpowersportsinc.com/clea ... 083_2.aspx

 

[700SCOTT]

I'm running (2) 6 hole nozzles =60 hp. into k+n's. i bought my kit used and it came with them and many other orifices(sp), but those were the biggest in the bag when i got it. i would think you could get even bigger yet from bondockers. not sure if or how much you could safely advance timing when spraying these motors, so i'm not much help there.

 

[rehm70]

Don't know about sled mtrs, but when you spray bigger four-strokes, timing MUST be retarded when spraying. When N20 is introduced into the combustion chamber, it creates a bigger volume of air and fuel, therefore combustion is sped up because natural compression wants to explode a fuel/air mixture that is much bigger than it is at natural atmospheric conditions. When the piston is coming up to top dead center, the expanded volume in the cylinder will want to ignite prematurely. With the timing advanced, the spark ignites this mixture before the piston is close to TDC. Retarding the timing slows down the process and allows the piston to get closer to it's normal ignition point in the stroke position.
The mixture is exploded and is trying to push the piston down before it is finished rising on the combustion stroke.
The effects of what can happen if the mixture is exploded too early, before the piston is to TDC can be broken ringlands on the piston(trust me), premature ring failure, bent conecting rods, broken crankshafts, and or bearing failure.
I'm sure this applies to the Yamaha four-stroke as well.

 

[700SCOTT]

I'm sure this applies to the Yamaha four-stroke as well.

these motors in the rx1 come from the factory retarded. i can tell you i put more than 30lbs through my sled with no problems and over 5000 miles, BUT I wouldn't recommend advancing timing. Even on a big/ small block car engine you can USUALLY get away with 100 shot before you have to start retarding timing of course depending on many variables ie. octane, compression, etc..

 

[NOS-PRO]

I'm sure this applies to the Yamaha four-stroke as well.

these motors in the rx1 come from the factory retarded. i can tell you i put more than 30lbs through my sled with no problems and over 5000 miles, BUT I wouldn't recommend advancing timing. Even on a big/ small block car engine you can USUALLY get away with 100 shot before you have to start retarding timing of course depending on many variables ie. octane, compression, etc..

What he said

 

[wantboost]

how can you retard the timing if i wanted to run a big shot