Identifying your Helix

triple

triple

New member
Joined
Dec 3, 2005
Messages
120
Age
44
Location
Madison, NH
I know that the Srx stock helix is 47, and the one that's on my sled looks like a stock Yamaha unit, but has a 51 circled and 8bv33...somethinglike that. Is this the stocker or some 51/??? helix.

I'm trying to figure out what's on the sled and go from there. I know it has 8bu-00 weights, engages at 4900rpm, red secondary spring. Seems to be setup for short drags as it rockets out of the hole side by side with a very strong 02 ZR800, but will fade on top and the ZR pulls away.

I've messed with the wrap, and haven't noticed a difference, the sled pulls hard either way.

Thanks in advance for any suggestions......
 

Turk said:
You got a 45 degree helix unless someone recut it.
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Thanks Turk. I'm getting closer to finding out what the hell this thing has going on. My 2 riding buds have an 02 ZR800 and 03 ZR900 and they swear this is the best going SRX they've raced. Supposedly, SRXMAGIC tuned this, but it was a few years ago. I'd like to get it to pull 8400-8500, but don't want to hurt it's holeshot. It won't pull past 8k at all......

Dead even with the 800 while under revving,(til topend) but the 900 is a different animal.
 
If your underreving & the sled used to pull that clutching you got some pulled thru powervalves.
 
Turk said:
If your underreving & the sled used to pull that clutching you got some pulled thru powervalves.
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Powervalves are good. I cleaned and inspected when I rebuilt the engine. That was 300 miles ago, this sled hasn't pulled past 8k since I bought it. I suspect it had aftermarket pipes on it, because the stockers where OH SO SHINY... Might explain the RPM? Just a guess.
 
I doubt it....It was probably geared considerably lower & taller grearing changed the clutching. Start lightening up the weights till u hit the sleds G-spot!
 
I read MrViper's Thread on the Tech Section. (Weights and their purpose) I'm considering the 8dn-00's they're roughly 4 grams lighter. One more consideration Turk? Please?
 
triple said:
I read MrViper's Thread on the Tech Section. (Weights and their purpose) I'm considering the 8dn-00's they're roughly 4 grams lighter. One more consideration Turk? Please?
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Can you not just put in lighter rivets in the tip instead of changing weights?
 
Equalizer said:
Can you not just put in lighter rivets in the tip instead of changing weights?
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I don't know? Will rivets make a 400 rpm difference? It tachs right up to 8k and doesn't move. I thought I read somewhere that the 8bu-00 don't have much tip weight. I'm still trying to understand clutching and if that's the case, it sounds cheaper then buying different weights!!
 
triple said:
I don't know? Will rivets make a 400 rpm difference? It tachs right up to 8k and doesn't move. I thought I read somewhere that the 8bu-00 don't have much tip weight. I'm still trying to understand clutching and if that's the case, it sounds cheaper then buying different weights!!
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I'm certainly no expert at clutching but from what I've learned so far, for every gram you add you lower the rpms by 100, so if you were to remove 1 gram you will gain a 100rpms. If you have enough rivet weight so you can remove 4 grams, then you should be good to go.
 
Equalizer said:
I'm certainly no expert at clutching but from what I've learned so far, for every gram you add you lower the rpms by 100, so if you were to remove 1 gram you will gain a 100rpms. If you have enough rivet weight so you can remove 4 grams, then you should be good to go.
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Do the rivets state clearly what they weigh? I like the sleds pull, but being passed slowly by an 800 twin just doesn't seem right. Well, I am under revving. At a 50 mph roll, I can hang with the ZR900 for maybe 2 seconds, then it motors away. i'd like to surprise the Cat Boys, YA KNOW WHAT I MEAN? :rocks:
 
triple said:
Do the rivets state clearly what they weigh? I like the sleds pull, but being passed slowly by an 800 twin just doesn't seem right. Well, I am under revving. At a 50 mph roll, I can hang with the ZR900 for maybe 2 seconds, then it motors away. i'd like to surprise the Cat Boys, YA KNOW WHAT I MEAN? :rocks:
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I don't believe the weights are marked but there are pics in the tech section so you may be able to tell what you have once you get the clutch apart. Just make certain the power valves are indeed clean as well as adjusted properly and you have a good belt on there before you start on the clutch.
 
you need to get a gram scale and weigh the cam arms with the rivets in them, (they sell them cheap at office max)what color the primary spring is ?? The primary spring is just as important as the weights, if they dont match weight to spring power, then youll either over rev or under rev if the spring is too weak for the weight. You might get a aftermarket helix in the range of a 52/42,50/40,48/38, and we could help you fine tune it from there, running with a straight 45 and those weights will be tough to get any good topend because in my opinion its too steep of a finish angle, your trying to load the engine with the secondary and you need a little shallower finish and it will allow you to run some good tip weight, 8bu-00 is a good drag weight but it can provide decent top end with a shallower fnish and added rivet weight.
 
mrviper700 said:
you need to get a gram scale and weigh the cam arms with the rivets in them, (they sell them cheap at office max)what color the primary spring is ?? The primary spring is just as important as the weights, if they dont match weight to spring power, then youll either over rev or under rev if the spring is too weak for the weight. You might get a aftermarket helix in the range of a 52/42,50/40,48/38, and we could help you fine tune it from there, running with a straight 45 and those weights will be tough to get any good topend because in my opinion its too steep of a finish angle, your trying to load the engine with the secondary and you need a little shallower finish and it will allow you to run some good tip weight, 8bu-00 is a good drag weight but it can provide decent top end with a shallower fnish and added rivet weight.
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I checked to see what the primary is, but it's kind of a rust color...No marking whatsoever. It engages at 4800-4900rpms. It sounds like my helix needs to be changed to pull rpms?

Can I possibly call you MrViper? It will take me a day to type as I'm a one finger shooter myself.
 
Triple, I have the same kind of problem on my 99 SRX. Goes up to 8000RPM, 8100RPM then doesn't go any higher. If you find out what is the problem, give me some feedback please. Thank you. Running 8BU-00 whit 4,5g tip and small aluminium ones on center with a spring I don't even can see the color. Red secondary wrapped 70. I've tried several times before to lighten the weights but it didn't changed my final RPM.

(I also have a 45 deg helix but I'm sure it would not affect that much)
 
Brun_SRX said:
Triple, I have the same kind of problem on my 99 SRX. Goes up to 8000RPM, 8100RPM then doesn't go any higher. If you find out what is the problem, give me some feedback please. Thank you. Running 8BU-00 whit 4,5g tip and small aluminium ones on center with a spring I don't even can see the color. Red secondary wrapped 70. I've tried several times before to lighten the weights but it didn't changed my final RPM.

(I also have a 45 deg helix but I'm sure it would not affect that much)
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Thanks for chiming in. I 'm hoping MrViper can get me through this. this sled pulls like a freight train, but a 600 might get by me on top. I've gone from max wrap to 60*, which I'm at right now. I see a few primary springs for sale in the classified, maybe that's an issue.

No more revs with lighter weights? What could it be then?
 
My brother got a new Y-W-Y spring, we are going to try this with lighter weights (got a spare set of 8BU-10's) I'm givin you some news tomorrow.
 
Brun_SRX said:
My brother got a new Y-W-Y spring, we are going to try this with lighter weights (got a spare set of 8BU-10's) I'm givin you some news tomorrow.
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Ok, I'll look forward to hearing your results.
 
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