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Post by geh3333 on Aug 3, 2014 23:21:10 GMT -5
If you want to get the most out of your scoot you will want to be able to get up to around 7500 rpms on a straight run without being able to hit 8000 rpms . This way your hitting your top speed without redlining . If you redline on a straight run you will want to raise your weights , and if you only hit 7000 rpms you'll want to lower the weights . Remember you can mix 11grams with 12 grams to make 11.5 grams . You usually gain or lose 500 rpms when going up or down a gram in weights , so switching from 11 to 12 gram weights u will lose 500 rpms and switching 11 to 11.5 grams u will lose 250 rpms . This is how you "tune" the cvt . I have my rpms set to max out around 7500 rpms , and downhill it sometimes redlines depending on how steep the hill is .
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Post by jerseyboy on Aug 4, 2014 12:02:53 GMT -5
I can get about 7300 RPM at over 60 MPH,,mine cruises so sweet at 45mph under 5k rpm,,has plenty of power to pull me up the big hills,,and no BBK yet..lol
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Post by geh3333 on Aug 4, 2014 14:41:52 GMT -5
Hey jersey did you ever try 12.5 gram weights ? It should bring you around 7500 rpms and possibly a couple more mph.
Right now your at a little over 60 mph so let's say 61 , now imagine using a bigger and better quality head and upping the bore " even if only going to a 58.5 " plus being able to run more fuel and air through the head " without running to rich" with the 32mm carb . All of a sudden 67mph dosent seem impossible . My tires will be in this week and I'll be posting a vid of my scoot running at 67 possibly 68 mph . I still need to order the external oil pump for my oil tank project .
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Post by blarboose on Aug 4, 2014 16:33:54 GMT -5
Ok, just go in from a run, and here's what I got. Keep in mind these are all fairly approximate, to withing 100 or so RPMs.
25MPH: 3500RPMs
30MPH: 3800 RPMs
40MPH: 4200 RPMs
50MPH: 5200 RPMs
60MPH: 5900 RPMs
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Post by geh3333 on Aug 4, 2014 19:50:05 GMT -5
Was 5900 rpms the highest it would go ? If so u need to drop the weight of the rollers so that you can hit 7500 rpms on a straight run .
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Post by blarboose on Aug 4, 2014 22:08:26 GMT -5
Was 5900 rpms the highest it would go ? If so u need to drop the weight of the rollers so that you can hit 7500 rpms on a straight run . That was about as high as it got. I was trying to not crash into anything while also getting a good look at the tachyometer, so... XD But yeah, all those values are accurate, give or take 100 RPMs in either direction. So do you think like 11 gram weights or 12 grams, or...? |
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Post by geh3333 on Aug 4, 2014 22:35:55 GMT -5
It all depends on what weights are in there now , forgive me if I missed it but do you know what grams are in the scoot right now ? If they are stock then there is a good chance that they are 14 grams . If this is so then I would order a set of 11 and twelve gram weights this way you can go fine tune the cvt . It's hard to say for sure without knowing what size are in right now and the weight of the rider also comes In to play . Another concern of mine is the mph . Are u going by he speedo ? And is it accurate " that is is it gps verified " because 60 mph at 5900 rpms dosent sound right , especially on a straight run .
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Post by blarboose on Aug 5, 2014 9:08:16 GMT -5
I dont know what size weights are in there, but chances are its most likely stock. I weigh about 165 or so, and yeah I was just going by the speedometer. I havent checked with a GPS.
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Post by geh3333 on Aug 5, 2014 15:00:46 GMT -5
I dont know what size weights are in there, but chances are its most likely stock. I weigh about 165 or so, and yeah I was just going by the speedometer. I havent checked with a GPS. Best thing to do at this point is just focus on the rpms .find a long straight road and run the scoot at wot and at some point the rpms will stop rising . To get the most out of the engine you want to be able to hit 7500 rpms . I would order a set of 10 , 11 and 12 gram weights . Just make sure you are not able to redline on a straight run . |
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Post by jerseyboy on Aug 6, 2014 19:00:39 GMT -5
I think his tach is off..but thats just me,,did you get a GPS speed reading,,cause 50 on a scoot feels like 70..lol
I did try 12g sliders in there geh3333,,it ran awesome,,but I like to do long hauls so keeping my R's down under 5K and loafing along at 45 is what I like..if I where to race I would run 11 or 12's in there for sure..I bet it would tach redline.
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Post by geh3333 on Aug 6, 2014 19:38:01 GMT -5
I'm thinking he is running more like 50 or so mph which would seem right for 6000 rpms but cant get above 6000 rpms due to the stock weights .
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Post by blarboose on Aug 29, 2014 14:31:42 GMT -5
Ok, so coming back to this after a little while.
The bike had been running fine for a while, but then I noticed some stuttering at WOT and a little drop in speed. I figured the carb might need cleaned, so I took it out, cleaned the jets really good, put it all back together.... and now it wont run faster than 25MPH. When I twist the throttle more than just a tiny bit, it just... doesnt do anything. Like, it seems like its trying to accelerate, but the fuel mixture is waaaaaay too lean. I know thats not it though, because even turning the fuel screw as far open as it possibly goes doesnt help anything.
I figured maybe I screwed something up in the carb, so I took it all out again, cleaned it again, put it back together... same problem. The bike runs normally when Im just barely twisting the throttle, and itll accelerate up to 25 MPH over a period of like 10-15 seconds on a flat surface, but thats all itll do. It wont go any faster, it wont accelerate any faster, and twisting the throttle beyond that first tiny little bit just makes it sound like its starved for fuel.
Ive checked the intake manifold, and its still intact. The air box/air hose seems fine, the throttle and throttle cable are both ok, the idle screw is set ok, and the battery is fully charged.
Any ideas? Im thinking it might be the fuel pump, just based on process of elimenation. I mean, I know that everything else involved with the fuel delivery is working fine, so the pump is really all thats left.
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Post by alleyoop on Aug 29, 2014 15:01:19 GMT -5
It appears since you only messed with the carb that something is amiss with it. Now what did you take out to clean is the question, did you take the fuel ratio screw all the way out did you take the main jet and defuser out that the main jet screws into. Did you take the diaphram out etc.. Reason I ask is this can happen: 1. If you took the defuser and the main jet out the needle guide may have fallen out. 2. If you took the diaphgram out it the diaphgram may not be sitted in the grove and leaking which would cause the needle not to be pulled out of the main jet and defuser. 3. If you took the fuel ratio screw out the tiny washer and tiny o-ring may have fallen out and it would be dumping to much fuel into the motor. Here is the needle guide it sticks out about 1/8 into the venturi check if it is there:  Here are the parts on the Fuel ratio screw:  Here is the diaphgram and where it has to sit:  |
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Post by rockynv on Aug 29, 2014 23:02:50 GMT -5
The more often you take a carb apart the more exposure you have to these types of problems.
With a good fuel filter and a reasonable regimen using a fuel system cleaner you should not have to regularly take a carb apart for cleaning on a bike that sees use at least once a week.
I usually only clean a carb when I first buy a used piece of equipment after which its just a minor 1/2 ounce per gallon fuel system treatment at lest monthly and I never have these problems unless a diaphragm or some other parts fails after years of regular use.
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..BAD TO THE BONE..