kirk700 srx
Member
I recently put 8dn20's with 5.5 grams each hole W-W-W spring and a 54/44 Bender helix with green spring on my 98 srx 700. I have 22/40 gearing and 8 tooth drivers 1 1/4 ripsaw for now going to 1 3/4 and Sled is reving 7500-7600 rpm Sled is pulling like crazy, shifts great, but I am just wondering where should I take some weight from?The tip or back hole?I want to raise rpm to 8400 Any suggestions?Also does anyone have dyno results of 98 srx peak horsepower rpm?
ywy spring or 4.5 gram rivets in each hole
YAMMIEGOD3:16
Active member
WHAT EVER YOU DECIDE TO DO, YOU HAVE ALOT OF WEIGHT IN YOUR PRIMARY, ESPECIALLY WITH A 44 FINISH ON YOUR HELIX. YOUR LOADING MOTOR DOWN. LIGHT,EN PRIMARY TIP WEIGHT. 3:16 (yammie tony)
Bender helix,s are very aggressive like advant-edges were. You need to remove 2-3 grams from each hole...but...i think you have powervalve issues. You should be pulling higher rpm,s with that set up.
kirk700 srx
Member
I checked and adjusted my power valves cleaned and adjusted carbs before I installed my clutch parts Sometimes rpm will jump to 7900 I guess I could double check my power valves tomorrow and see if I have them adjusted properly.Turk said:
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staggs65
Moderator
RPM CBT CBHP BSFC A/F Ratio
6800 82.7 107.0 0.685 11.37
6900 83.7 109.9 0.702 10.88
7000 84.5 112.6 0.693 10.87
7100 85.6 115.7 0.692 10.79
7200 85.5 117.2 0.676 11.04
7300 85.2 118.4 0.681 10.94
7400 86.6 122.0 0.689 10.57
7500 87.4 124.9 0.691 10.52
7600 87.9 127.3 0.682 10.52
7700 88.4 129.5 0.662 10.71
7800 89.5 132.9 0.627 11.27
7900 90.9 136.7 0.625 11.17
8000 90.9 138.4 0.614 11.33
8100 91.4 140.9 0.624 11.18
8200 91.0 142.0 0.618 11.33
8300 89.2 141.0 0.632 11.23
8400 87.8 140.5 0.600 11.92
8500 84.9 137.4 0.622 11.82
kirk700 srx
Member
I had a pull through and replaced the valve. the other two were great shape. Could it be, it is not usual operating temperature it is 0 to -7 last weekend as compared to - 20 to -30? All plugs are burning really black, not tan like they should!Turk said:
Is servo motor working?
kirk700 srx
Member
Now that might be the problem, the servo is twitchy! I have other servo's that i can try. I will change it out today and see if that fixes anything!Whammy said:
kirk700 srx
Member
I changed out the servo motor ,No change! Checked for pull through's all great shape.Readjusted power valves to 2.5 mm. I tried Y-W-Y primary spring, No change! Changed smaller primary rollers with the Y-W-Y and W-W-W , No change! Tried new belt, No change! Checked and re adjusted carbs,kirk700 srx said:
Still No change! Highest Rev was still 7900! Anyone have another option?
a 54-44 seem alots to go with full loaded 8dn-20
kirk700 srx
Member
Im gonna try my straight 47 again to see where my revs sit! I am just trying to eliminate the cause of the problem!modsrx said:
Had one of our Viper's only pull to about that, anymore and it'd want to bog out. Turned out to be the reeds.
Did this revving to 7900rpm happen after you changed the clutch setup or just out of nowhere?
Did this revving to 7900rpm happen after you changed the clutch setup or just out of nowhere?
kirk700 srx
Member
SXlover said:
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staggs65
Moderator
i like yammiegod and modsrx replies, last year i tried a 54/46 with my heavy hitters loaded pretty good and it'd pull like a freight train for 2000' then the rpms would tail off, i'm doing some engine mods for this year so i'll try that setup first with the mods but if it still drops off on top i think i'll try 50/40 or something
kirk700 srx
Member
It does seem to be alot to go with, but my gearing is 22/40, 13 wide with 8 tooth drivers, my rpm's were gonna go through the roof! Thats why I used so much weight in my primary. I figure there is something stupid that is holding rpm down. Maybe ill have to lose the 1 gram washers from the tip like Yammigod mentioned but I am gonna try my stock primary and see how high my revs really are ! I used a spare clutch for my new weights and spring so I have stock ready to bolt on and go! I also have a maxx roller secondary with a 40 32 helix.I am guessin that is not enough helix angle to run?? Also a 30 stock helix which I believe is a straight 41 degree. A {70 stock and a 71 stock} both are 47 Degree Keep your opinions coming the more the bettermodsrx said:
Thanks
Kirk
staggs65 said:
if it drop rpm on top the tip is to heavy ..............
stupid clutch
kirk700 srx said:
it will overrave till it shift then rpm will died .....secondary seem to shift wayy to fast
staggs65
Moderator
yeah i agree but in the end i still don't think it was the right helix for my application