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Discussion Starter · #1 ·
I have 2002 ZR 800 CCE been over reving to 7900 , and found out it is clutched with D&D kit for twin pipes ( twin pipes gone when I bought it). Here is my question? I currently have a 170/305 spring with 73 grams (Revs 78-79). I am thinking of throwing some 78 grams in there with this same spring to lower RPM's. The kit from D&D calls for 190/330 spring and 81 grams. Secondary is correct with D&D helix and spring. Do those two primary combos sound similiar. Or should I just spend the money and get bigger springs and weights?
 

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The helix angle and spring in the secondary are probably for the twin pipes too. You need to re-clutch for the stock pipe.

94tcat900
 

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The weights you are using are good but you need to lower the final rate on your primary spring in order to bring the RPM's down.A good spring for your application would be the A/C orange and white spring with a rate of 143/290. Don't know what angle helix you are using,but if you raise the final angle it will also lower your RPM's.
Maybe a 59/53 or 58/54 could work for you.
I'm running an orange and white Cat spring with 71.5 weights,a 57/50 A/C helix and a D&D grey 67/123 in my son's 02 ZR800 CCE with a top RPM of 7500.It's a little
high and will try a 58/52 next time out. You want to shoot for around 7300-7400 with a stock motor...
Don't waste your money on heavier weights,it's cheaper to buy a couple used helixes and new springs and dial your sled in for your weight and track setup !
 

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whats so bad about 7900?
 

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Your half way to a great clutch set-up, go for the blk, primary and the 81 gramers.
 

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Discussion Starter · #6 ·
I would think a lower spring rate would mean higher RPM with same wieght. Is this incorrect? I guess I'll try the spring I got and just add the 78 gram weights. They are 5 grams heavier then the 73 and should lower RPM. The D&D secondary and spring are perfect for my stock setup, according to D&D, they told me only need to modify primary to get back into peak power for stockpipe.
 

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Lower spring finish rate will bring the peak r's down. Do you already have the 78's?
 

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The weights you are using are good but you need to lower the final rate on your primary spring in order to bring the RPM's down.A good spring for your application would be the A/C orange and white spring with a rate of 143/290. Don't know what angle helix you are using,but if you raise the final angle it will also lower your RPM's.
Maybe a 59/53 or 58/54 could work for you.
I'm running an orange and white Cat spring with 71.5 weights,a 57/50 A/C helix and a D&D grey 67/123 in my son's 02 ZR800 CCE with a top RPM of 7500.It's a little
high and will try a 58/52 next time out. You want to shoot for around 7300-7400 with a stock motor...
Don't waste your money on heavier weights,it's cheaper to buy a couple used helixes and new springs and dial your sled in for your weight and track setup ![/b]
What is your engagement at wildcat? I have a set of 72.5 weights and an yellow/white and yellow/green primary springs.
 

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The engagement on the 02 ZR800 CCE is 4500 RPM's. It has a 1.25 predator track with 144 Woody's studs and is basically stock. My 13 year old son weighs 130 lbs and
the setup is just perfect for him. He takes my 03 ZR900 with "V" forces and 2 degree timing key off the start until around 60 mph where i catch up to him.
The yellow springs you have are not good for a ZR800 as the rates are 122/285 and 114/267 which would probably engage at around 3800-4200 rpm's.If you have studs that's a little on the low end.I just used the stock 71.5 weights from my 03 ZR900 for the 800 and i'm running 74gr Daltons on my 900.
It's a lot cheaper to play with helixes and springs than to buy heavier weights in which case you will need the proper springs and helixes anyways... more money !
 

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That is the eng. I am looking for,near stock.I also have 59/53,58/52,57/52 and 57/50 helixs and an epi green primary and epi blue secondary springs.
 

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Your EPI green primary spring rate is 145/260 which might be low on the finish rate although the engagement will probably be right on..EPI does not make a blue secondary for a non diamond drive cat as the rate for the D/D springs is much higher.With all the helixes you have you should be able to dial in your sled pretty good !
I'm running a grey D&D 67/123 secondary spring on the 800 with the tab in the middle hole.
 

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My 06 EPI catalog shows a blue secondary for a non diamond in a 63/118 rate.I am thinking the 72.5 speedwerx weights,green EPI Primary 145/260,57/53 helix and the blue secondary.I am hoping that will put me around 4000 with a 7300-7400 finish and play with the other helixes to fine tune.
 

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Discussion Starter · #14 ·
Well the 78 gram weights are in and I'll report back on the difference. Stayed with the 170/305 spring should be close. I'll know Saturday.
 
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