Lighter clutch weights at low elevation

Couch

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Have a 14 stock pro 800 (stock spring plus 62g weights) that completely whoops our pair of 15 pro's with low elevation clutching installed from dealer (gold spring and 70g weights). The 14 is also 15% better on fuel in the powder!!
The 15s feel gutless in comparison. The 14 engages at 4100 and hits 8400 and holds 8300 while the 15s engage at 3600 and pull 7900 / 8000.

Riding drainages and valleys at 1000' to 2000' but wondering if the clutching is too light on the 14 and whether or not it's too hard on the motor.

Any experience / feedback re light clutching at low elevation appreciated.

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BILTIT

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Whats in the secondaries of each?

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kanedog

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Kanedog 2015-2019, thanks for the good times S&M!
Light weights and light springs is practiced by only a few tuners. Most aren't willing to put in the effort and time. That and it goes "against the grain" so to speak.
97% of tuners clutch with heavy springs and heavy weights. The heavy weights/heavy spring combo makes your sled slower revving and wears out the clutch waay faster.
The proof is right in front of your eyes. The sled with 62gram weights dominating a sled with 70 gram weights.
I do find it funny, but not in a condescending way at all, that you are wondering if the lightweights are wrong because its so much faster than the sled with heavier weights. And also the 70g weight sleds feel gutless. Lightweights won't hurt the motor.
I say convince the '15 pros to keep the 70g weights in(they can brag about how many grams their sled pulls) and you keep on whooping!!!!!i
 
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Couch

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The 14 definately has more power on the bottom end which is where we typically need it for the type of riding and elevation. Only wondering if it's harder on the motor / clutches with the lighter weights (stock) .... Always ready to learn from others who have already gone through it.
Service manual (2013) shows stock spring and 68 g weights for our elevation - assume 14 & 15 are the same. Dealer installed low elevation clutching on the 15s with 70 g weight and gold / almond spring. The 14 was bought used and looks like clutching was per factory stock setup.
Would like to set up the 15s to run as well only wondering if the lighter setup will / could cause premature wear.


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kanedog

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Kanedog 2015-2019, thanks for the good times S&M!
Take the 14 clutch cover off and see what spring is in it. Stock is around a 120/310 and a poo gold/almond is a 150/290. The engagement/top rpm's characteristics you describe don't match the springs so the 14 may have a different spring than stock.
To test what combo is best, swap the clutches between the 14 and 15 and ride. If the 15 is faster, buy the same springs and weights as the 14 and have fun! Woo-hoo
 

Couch

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Black stock on the 14. 140 / 330.
Almond gold on the 15s which is 140 / 290 acc to 2013 service manual.
The engagement rpm on the 14 is a little high at 4100 / 4150 while the engagement on the 15s are at 3600 / 3650.
Curious as to potential impact on engine life if anyone has similar experience.

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ABMax24

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Black stock on the 14. 140 / 330.
Almond gold on the 15s which is 140 / 290 acc to 2013 service manual.
The engagement rpm on the 14 is a little high at 4100 / 4150 while the engagement on the 15s are at 3600 / 3650.
Curious as to potential impact on engine life if anyone has similar experience.

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Nothing wrong with pulling 8300 RPM's at WOT, I believe peak power is 8250RPM on these motors so you are right where you need to be. 2-strokes aren't torque producing monsters, you have to let them spin to make the power.

Running plus or minus a little on RPM will have very little impact on engine life. Putting good fuel and oil in significantly effects engine life however.
 

Couch

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The 15s have almond gold 150-290 primary spring so what weights would bring it closest to 14 stock clutching (black spring 140-330 with 10-62). More or less weight???

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Chrisco

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Put the stock spring back in the 15 sleds, that 150/290 is not what it needs. What rpm does the 15 pull?
 

Couch

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Dealer changed out stock spring and weights for low elevation clutching and looks like add +2 grams for warm temps per service manual.
What weight with the gold almond spring will bring it closest to stock - 60 / 62 / 64?

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