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Post by chanito on Apr 4, 2005 16:08:44 GMT -5
;D ;D Yeah, Dandy i totally understand the more power part, but the reason to have timing advance is that gas burns at the same speed, but your engine runs a lot faster at higher rpms, so in order for the combustion to be at its most expanding, the combustion has to start earlier at higher rpms, the desiring effect would be to have the gas expanding at its higher rate when the piston is just past the top dead center, you do not want this at top dead center or before, becouse it will create a piston going up when the explotion is pushing it down, super bad for the bearings and the piston pin, most engine manufacturers put the timing just a little retard to be on the safe side. However the timing does not have any effect on the engine top speed unless the timing was way off, the top speed of the scooter is limited by the engine speed, now the valve adjustment have a direct effect on engine speed, by limiting the breathing capability of the engine, in any case the timing might be very conservative on the ruckus so the cdi should give a couple hundreds rpms, it is just i am not that crazy about cdi and by passing the rev limiter
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tygerfifteen
Ruckster
knobby tires,cdi, k/n filter,variators,rollers
Posts: 248
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Post by tygerfifteen on Apr 4, 2005 16:39:55 GMT -5
oh man , tha typo was bad, sorry anybody (half my senior men's bball team is black and some of my best friends are, so not to offend anyone)
but chan I see what your saying that it wouldn't effect top speed and i was thinking the same thing if i didn't to nothing to the variators. but as a noob with a noob cdi, I would recommend it, i mean my pick up has increased alot ,me and my other friend with no mods go side by side and off the hop i'm ahead like 2-6 scooter lengths, also today i usually jump speed bumps, like use them as a ramp but first time with the cdi and i gave er some gas before the bump , i flew in the air as the same height distance as if i was going fast, it was weird. But i still want some top speed. oh did i mention i have no rear fender yet because i swaped brakelights and lowered them, so it rained, and the splashes were all the way on top of my helmet, did i mention the mud? LOL
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Post by Dandy Dan on Apr 4, 2005 17:12:41 GMT -5
Well it is possible that all my top speed increase is due to increasing the airflow and messing with the carb. I played with the airflow before I installed the CDI and for a while there I didn't have it adjusted perfect so maybe I just installed the CDI on a cold night and my Ruckus ran better or something but I am pretty sure that I noticed an immediate 1-2mph increase.
Perhaps Abe will come on here and provide some more info.
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Post by greenchopper on Apr 4, 2005 20:30:43 GMT -5
The cdi just gives you a higher rev limit, usually a grand extra. Stock the rev limit is like 8k which allows you to go 37-40mph. With the cdi that electronically allows an added thousand rpm, or one that eliminates it completely, you are basically going 42mph at 9k rpms.
But when is the actual redline? Probably at the stock setting. Thats why it helps to have a tach along with any mods to help dial in the roller weight set-up and you will also know what rpm your motor blew up at at because you do not have a rev limit with the cdi. The stock box is almost a safety device for these chumpy little 50's to keep from blowin', and to keep the safe 30mph cruising speed on the motor.
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Post by greenchopper on Apr 21, 2005 16:27:09 GMT -5
(weeks later)
I installed the Daytona CDI at school the other day. As I was installing it my buddy nobu from Japan cruised in and I asked what the bulletized features were on the japanese instructions. They said:
...elinates 8000rpm limiter... ...something about changing the fuel curve after 7000rpm for increased top speed...
Mind you nobu is not into things on wheels as much as he's into metal. So when he translates for me its like spanish to him. But for the most part the fetures have been translated.
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Post by chanito on Apr 21, 2005 19:14:45 GMT -5
Ok this is interesting, and that would explain why you guys get more speed and the performance is so much better, being a carburated engine i did not think a Cdi would have any affect in the fuel mixture, but, the post just above said that it affect the mixture above 7k, i just realized that it can affect the cold enrichment valve and that would give you a burst of speed if you had opened your intake, so yes it is posible to run faster with just a CDI, becouse it can erase or delay the rpm limiter, advance the timing, and enrichen the mixture at the right time 7k+, i think i should give the idea of getting a CDI another chance.
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Post by greenchopper on Apr 22, 2005 3:16:55 GMT -5
It's a good step to take. Look at other honda 50's like the Xr. One of the main mods is a cdi, and my buddies xr50 hauls for a three speed. I wish we had three-speeds with a little kickdown shifter like hondas business motorbikes.
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Post by abe on Apr 23, 2005 7:24:03 GMT -5
OK! Here I am..... like anyone cares My Ruckus as other Ruckus' can reach the limiter from time to time. The CDI removes the limiter completely. Your new limiter is the engine and intake/exhaust. Lucky for everyone the motor is the biggest limiter. My motor revs so high the tach stops working ;D I have had it over 60mph down hill, not a steep hill mind you just long. So even when you do the mods and your motor revs to the moon you still have power as a limiter. The Ruckus can't pull 60 on flat and I don't think it ever will.. ever! So, with the CDI your intake limits RPM. If you do the cam and head work the valves become the limiter and so on. The motor is really matched well so each change you make only bumps you as slight bit. How did I do
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