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Post by millsc on Feb 12, 2013 13:03:29 GMT -5
I got my performance clutch from scrappys, it's nicely made with bigger clutch shoes and metal parts also much lighter than the stock clutch. I tried all the springs 1k 1.5 and 2k actually i like the stock springs the best, the others including the 1k made it less responsive. It seems to lose that nice low end torque and grunt with the higher rated springs. Maybe i was just used to the stock springs, i kept the 1k springs in, and gonna drive with them for awhile to see if i can get used to the difference, if not i'll keep the stock clutch springs with the performance clutch.
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Post by lovemy2strokes on Feb 12, 2013 13:17:40 GMT -5
Heya, use different contra springs in conjuncture with the triple springs to get the best take off for the power. The triple springs really are for tuning the take off rpm for high rpm camed or high ported 2 strokes. It just helps get the power band where you want it.
When I do 4t triple springs that allow for, say 3-4k release, higher rpm release is joined by using a heavier pressure contra so that you near do a wheelie every time you goose it under 20 mph and as you go to slow down the clutch springs will disengage at a higher rpm so you dont have that feeling of putting your auto car into 1st gear when slowing down. Hard to explain with out getting technical. Although this is fun its more for race day than practical street use, but then again I run these in my 6.89:1 geared 2t on the street and it works great because other wise it would just burn my clutch to hell.
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Post by lovemy2strokes on Feb 12, 2013 13:22:21 GMT -5
I use light green polini springs that release at 5.5k on my highway "49cc" and a white "reinforced" Malossi contra spring and the prodigy race clutch, a Polini evo 2 shoe race clutch set up for 7k and a Malossi MHR delta clutch set up for 3-6k launches.
The 5.5 springs on the prodigy work very well for around town and brief 80 mph runs but the evo is the only one that holds 13k for long runs with out slip.
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Post by millsc on Feb 12, 2013 13:23:36 GMT -5
I run the 1.5k contra spring and with the stock clutch springs i could set my idle right at the end of the clutch grabbing rpm, and it was very responsive. It may take off better with higher rated springs, but i lost the responsiveness when i crank the the throttle. I guess i could turn up the idle to get that back, but i'd be idling around 2.5k rpms which is too high for my liking.
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Post by lovemy2strokes on Feb 12, 2013 13:26:17 GMT -5
Are you talking about triple springs or the contra when you say 1.5k rpm? If youre losing responsiveness try to lighten the front pulley weights by 1g total weight at a time and you will regain that burst of speed as the front will slide out faster and you wont have to have a high idle rpm.
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Post by millsc on Feb 12, 2013 13:27:39 GMT -5
I have a 1.5 contra "torque spring" I tested the three clutch springs each rpm.
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Post by skuttadawg on Feb 12, 2013 16:47:41 GMT -5
When testing springs you may also want to test various weights too
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Post by millsc on Feb 12, 2013 16:56:45 GMT -5
I have my weights exactly the way i want them to keep rpms 7500-7900 max at wot had to buy several sliders to achieve this, I have a 9.5 and 9 gram mix.
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Post by super9 on Feb 12, 2013 17:00:00 GMT -5
i like my set up 1500 contra 2000 clutch springs not a huge kick off the line but quick enough to beat cars still might drop the contra to 1000rpm but im gonna have another play about with the weights ect
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Post by millsc on Feb 12, 2013 18:36:21 GMT -5
raised my idle slightly, its a little better
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Post by wutzthedeal on Feb 12, 2013 21:50:55 GMT -5
I can't get my rpm over 6k. I used to get up to 8.5k. Wish I knew what I screwed up.
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Post by edfr on Feb 12, 2013 22:00:38 GMT -5
I can't get my rpm over 6k. I used to get up to 8.5k. Wish I knew what I screwed up. What did you change list everything. Lefty |
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Post by wutzthedeal on Feb 13, 2013 8:05:48 GMT -5
I can't get my rpm over 6k. I used to get up to 8.5k. Wish I knew what I screwed up. What did you change list everything. Lefty Well I can't remember exactly what changed since I last got around 8k rpm, but possibly the CDI and since then. I had problems with some stator wiring but didn't realize that was the problem, so ended up taking the carb out and cleaning it. I'm 99% sure the hoses are at the correct tightness when I put it back in. I've adjusted A/F and idle a few times. Cleaned and dried air filter(s) and put them back in. I can't think of anything else. EDIT: Sorry, don't want to hijack this thread; please just message me if you have any ideas. |
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Post by lovemy2strokes on Feb 13, 2013 9:40:10 GMT -5
You need to figure out if its a lack of power or lack of transmission travel. Start it up and remove the cvt cover and watch your trans and see what its doing.
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Post by lovemy2strokes on Feb 13, 2013 9:45:25 GMT -5
I have my weights exactly the way i want them to keep rpms 7500-7900 max at wot had to buy several sliders to achieve this, I have a 9.5 and 9 gram mix. Everytime you change the onset pressure(contra) youre going to have to rebalance the CVT. Its not a matter of max rpms but a matter of your transmission tuned correctly. You more than likely have a few more mphs left in the transmission if tuned right. Or not, its always a fun battle. Ive spent weeks before tuning my trans right on my personal rides. If youre tuning for a certain rpm that should involve the rollers last not the first thing to change just like the scenario you have now. Raising your idle is going to eat more gas than allowing a higher max rpm if thats what youre worried about. You may be lugging your engine at those rpms and you can always control the max rpm with the throttle. With the carb and other "performance" parts on your engine your power band is not going to be low like a stock engine. |
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Post by millsc on Feb 13, 2013 10:10:49 GMT -5
I didn't change my contra spring, just the clutch springs.
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Post by millsc on Feb 14, 2013 0:10:19 GMT -5
nevermind i tightened the throttle cable it was loose after jet change , works like a champ.
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Post by skuttadawg on Feb 14, 2013 0:12:59 GMT -5
millsc ever use the bb torque spring base ?
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Post by millsc on Feb 14, 2013 0:16:20 GMT -5
no i seen it on partsforscooters.com, it runs snappy now after i tightened the cable. may retest all the springs.
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Post by skuttadawg on Feb 14, 2013 0:18:40 GMT -5
When you test spring may require retesting weight too
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Post by millsc on Feb 14, 2013 0:21:11 GMT -5
possible i may change some things up, for retest pm your number kevin, i need your help on some issues i have with a 2 stroke job. You know your stuff.
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Post by skuttadawg on Feb 14, 2013 0:25:39 GMT -5
Check your inbox
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