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Post by SqUiRmInAtOr/ Phred 501 on Sept 19, 2005 21:18:01 GMT -5
Went back to a previous set up with gauze intake, CDI, .90 main jet, shimmed needle,stock variator with all 6's, and the Morwaki exhaust. Pulls like crazy at full throttle. (40mph @ about 9300rpm) but now has a stutter @ less than full throttle more so when comming down from full. Smoothes out when I give it more throttle but kind of hard to figure when it's gonna happen. Don't remember this whn I last had the same set up. Have yet to clip the diaphram spring. Any ideas?  Thanx in advance ;D |
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Post by chanito on Sept 20, 2005 6:23:58 GMT -5
Seems like maybe you have a dirty fuel filter, when at full throttle the sensor in the carb will give the fuel pump full juice and the gas level inside the carb will be OK, but at less than full throttle the fuel pump gets less voltage, and sometimes a dirty filter will prevent the carb from getting a full load of gas |
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Post by SqUiRmInAtOr/ Phred 501 on Sept 20, 2005 7:47:05 GMT -5
Seems like maybe you have a dirty fuel filter, when at full throttle the sensor in the carb will give the fuel pump full juice and the gas level inside the carb will be OK, but at less than full throttle the fuel pump gets less voltage, and sometimes a dirty filter will prevent the carb from getting a full load of gas Makes sense!! I also notice there is no stutter prior to engine being fully warmed up which is in line with your theroy. Thanks Chanito, I'll be checkin out a new filter. |
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Post by Dandy Dan on Sept 20, 2005 19:29:26 GMT -5
9300 RPM??? That's really getting high. A the stock gear ratio will do 41-42mph at 8000rpm so your weights must really be preventing it from getting to the top gear ratio.
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Post by SqUiRmInAtOr/ Phred 501 on Sept 21, 2005 0:33:36 GMT -5
the stock gear ratio will do 41-42mph at 8000rpm If this is true then why won't a stock Ruckus do 41-42 down hill with a mighty tailwind?? The limiter doesn't kick in till 8k so it should do 40 anyway. I have to agree those sixes must not be pushing the belt all the way up. With heavier weights I never saw this high an RPM and never saw 40 either. It got to around 8k (38ish)and didn't have any poop left. With my aftermaket variator (3-5.5 & 3-6g roller weights) the top speed is about the same but the rpm rarely higher than 8k.It's heavier than stock before you add the rollers so it won't ever spin as fast as the stocker. I've only seen 42ish a couple times and that was downhill with the wind and reving less than 9K. Got me swinging, belt wear, slippin on the clutch or variator? I do know it's fun as heck feelin that engine roar past 9K ;D |
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Post by chanito on Sept 22, 2005 12:01:12 GMT -5
 A shaved variator should be seeing 8k at about 41 mph, mine was, then i shaved the outer face and was doing 42 at 7500, i replaced the weights and added a CDI now i am at 42 while doing 8k, however i will need engine mods before i can get the ruckus to pull more than 8k, i live in South Miami and this is as flat as you can get, so i do not get the luxury of a downhill to get those high rpms my CDI can give me
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Post by SqUiRmInAtOr/ Phred 501 on Sept 22, 2005 13:53:56 GMT -5
A shaved variator should be seeing 8k at about 41 mph, mine was, then i shaved the outer face and was doing 42 at 7500, i replaced the weights and added a CDI now i am at 42 while doing 8k Now I understand Dandy's 42@8k on a "stock" variator statement. Stock, modified variator makes sense. Mine is not modified so it stands to reason it will pass 8k and still be under 40. I swapped back to the Datona (3-5.5s & 3-6s) and the revs are back down.8k puts me close to 40.( Gotta take into consideration I've got that big 24x24" slipstreamer on the handlebars and my 235#s loadin up the engine too) Gonna try swapin the 6s for 8s(on the Daytona) again and see if the top speed goes up or down. Experience has taught me that there is more power to accel with the higher RPM.(I'm curious where the power band really is.) In the past heavier weights drove the all the way out belt out too soon (low 7k's) and the engine didn't seem to have the power to pull me faster. With the stock unmodded variator I noticed extra pulling comming in the mid 8k's. One of the things I love about the Ruckus is there seems always to be room for improvement. |
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Post by chanito on Sept 22, 2005 19:35:25 GMT -5
 The torque curve is super nice up from 5k and up peaking a 7000 rpms and then dropping off, the hp is a little peakier, one of the things i would love to do is making a forward facing intake, and to modify the head so to straighten the port, that should keep our hp and torque curve to not drop so radically, that u turn in the intake make the carb vertion run lean by necesity, because it creates fuel separation at hi-rpms, maybe another project
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Post by ace1969 on Sept 22, 2005 19:37:15 GMT -5
Kind of like a ram air intake for the ruck?
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Post by chanito on Sept 23, 2005 6:30:38 GMT -5
 No, we do not go fast enough for a ram effect to be efficient and besides the carb would be behind the batt box, this is what happens, the engine in the ruckus is installed with the piston and combustion chamber facing forward, the intake and filter are facing the back of the scooter, so as the mixture travel toward the combustion chamber it has to do a sharp u-turn, the bad part of this deal is that we need the gas to remain atomized in order for it to work, inertia however will sent the heavier gas toward the outer wall of this u turn allowing it to become liquid again, so it will not burn, to prevent this we have to keep the mixture in our ruckuses on the lean side, and that is what is preventing us from getting more horses with more rpms, because if we start getting fuel separation we will develop a miss and drop the power noticeable, lowering our top speed
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Post by Dandy Dan on Sept 24, 2005 13:27:42 GMT -5
Sound like a big project Chanito. You'd have to move the carb which could be tight...You can help this U turn port problem somewhat with a custom porting job by straightening the curve a bit as you enlarge it. I tried to do this a bit when I ported mine but I really didn't do much porting as I didn't have the best tools for it so someday I'll do it right. Hey Chanito, did you ever get rid of that lip the air/fuel mix runs into right as it leaves the carb? (cuz the rubber hose slides over a blunt metal tube)
I don't have a tach yet so I can't really participate in this thread but I did mean in my first post that a stock, stock variator should do about 41mph at 8k. I was basing this on that the fact that when I was totally stock I could bomb down a big hill and get to 41/42mph and a backfiring bang would start as the engine was cutting the spark or something. I didn't have a tach but I'm pretty sure this happens at just over 8k. Someone with a stocker and a tach would know better though. I think Phred is gettting over 8k and under 40mph because he has ligher weights than stock so the belt doesn't ride quite as high even if it is geared taller. I don't really know the whole deal with the revs etc as I don't have the tach but I'm still looking for a good one and when I get one I'm gonna graph my Kitaco variator from 0-50mph using a 5g, 5.5g, 6g, 6.5g, 7g and 7.5g roller weights to see what trends I can notice.
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Post by chanito on Sept 25, 2005 5:10:35 GMT -5
That is just a dream project, moving the carb is actually the easy part, the killer is that the head comes with the intake pointing back, the famous u-turn is actually in the head, so it will require some cutting and welding in the head, extremelly expensive! Heck it will be cheaper to forge a new head ( :-*maybe a twin cam 4 valve  )
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Post by Dandy Dan on Sept 25, 2005 9:14:49 GMT -5
While we're designing dream heads I'd like a dual cam, 5 valve head with straight ports and polished since I'd have fuel injection.
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Post by ace1969 on Sept 25, 2005 17:27:55 GMT -5
And if I ever win one of those super lottos for like $200 mil I will finance this super ruck. Chanito you will have to move this way though I hate the heat down there and I don't do hurricanes. Lake effect snow is the closest I want to be to extreme weather .
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Post by chanito on Sept 25, 2005 19:54:11 GMT -5
Keep me away from the phone
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