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Post by dexameth on Oct 17, 2018 14:03:51 GMT -5
To omit the transmission simply remove the variator and belt, then replace the variator without the variator body or weights. Backplate>boss>faceplate then reassemble the cvt cover. Your scooter will now start up and have insane throttle response so be careful, it can over-rev really easy. I did a RPM pull of 11,800 on my little QMB before the stroker crank went in, sounded so crazy!
Then, with the engine off and the scooter on the center stand you can spin the rear wheel freely and feel for grinding, same with the clutch bell.
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Post by katt on Oct 18, 2018 3:27:28 GMT -5
Hmm i did not think about checking on stand because it vibrates from rear wheel being in the air too much, but ill check again.
I got brand new variator though think problem might be in clutch.
I also got some wired kick when clutch disengage on slowing down to 45000rpm.
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Post by SMALL CC TEK on Oct 18, 2018 15:39:50 GMT -5
Short answer : If you go big on carb 24,28mm you will lose bottom and midrange hit and your top end will come in slow , what you do by sticking a large carb on a motor that can't eat that much air is move the powerban around or Flatten it out !! If you use a 19,20, 21 mm you will use way more of the carb not just WOT Wide open throttle . Ultimately you want a powerband that from off idle to top end pull it's pulling hard as possible right till whatever rpm number your attempting to meet . If you get it right your scooter will have max power at any throttle setting .. Carbs take some tuning you can't just stick it on and expect major power gains ...
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Post by dexameth on Oct 18, 2018 15:46:54 GMT -5
Hmm... I don't know why everyone thinks you're gonna lose low end, I have a grunty little wheelie machine with the 24mm, have great low end power still.
When I popped this sucker on it was instant gain, but it is true, you'll be adjusting it for a bit to dial it in perfectly. From jetting to needle clip position to intake runner length, all of it adds up.
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Post by dexameth on Oct 19, 2018 12:58:39 GMT -5
You know what, tonight the 26mm CVK is going on. Will report back.
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Oct 20, 2018 9:53:00 GMT -5
We have so much discussion on here about “ low end power”. Well that means a lot if you have a Manuel trans and a clutch. But we don’t. We have a CVT on these little dudes. Unless you have screwed with your CVT, that means your engine jumps to around 7500 rpm almost at once! Highly modified engines will go way beyond that unless you go to heavier weights
Of course that doesn’t mean the engine will run clean at lower RPMs, but once you open that throttle, you should be at high rpms almost at once
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Post by magoconnor on Oct 20, 2018 14:35:41 GMT -5
What do you guys think would be a good size carb for a 52mm+Bvh ( 23/20) ?
I want to keep the max rpm at around 8700.
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Oct 21, 2018 8:08:00 GMT -5
I have very good results with a 22 (now on 3 machines)
a 20 would work fine in the 8500-9000 rpm range
i ran a 20 for a good deal of time and frankly only went to the 22 when I couldn’t get a 20 I wanted ( on back order)
we ran a 23 on earsplitingloudenboomer and it was fine except for some reason it had starting issues. Didn’t loose any top speed by going back to the 22 so that’s what we kept
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Post by dexameth on Oct 22, 2018 7:57:35 GMT -5
So the 26mm CVK is awesome. I popped the same 42 idle and 112 main jets that I had in the 24mm with the needle on the 2nd to bottom most notch and it has a little more noticeable torque. I haven't even played with jetting or the needle yet, just the idle adjustment screw to let it purr. My starter motor, bendix, all that is gone now, kickstart only, and this morning at 68 degrees it fired up first kick.
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Oct 23, 2018 8:11:28 GMT -5
So what were your times/speeds before/after. I track 0-30 and 0-40 plus top speed after 1/2 mile.
Just wondering did you run with the big bore kit before stroking it? If so, what were your times w BBK and w BBK+striker. We just put a striker crank in earsplitingloudenboomer and not seeing any real inprovment. Same top speed and zero to 40 times in the same bracket. Of course we haven’t had time to screw with it much other then getting the jetting right.
Just wondering, how did you adjust for the higher piston height? We cut some off the top of the piston and added a thin spacer under the jug. Compression is at 210 psi which is a bit high for my taste on pump gas but we really don’t have any more slack on the timing chain to bring it down. Running a 23 mm carb how and very happy, tried a 24 but no inprovment and harder starting. Thinking of going to partsforscooters and getting the latter intake manifold and larger carb to try. Engine pulls 12,500rpm at top end, very scary to ride up there! ( this from a guy that rides M/C 200 mph most weekends!)
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Oct 23, 2018 8:25:09 GMT -5
What do you guys think would be a good size carb for a 52mm+Bvh ( 23/20) ? I want to keep the max rpm at around 8700. while I run mostly 22s one of the guys I helped with a BBK has a 23. He got it from scrappydog along with a metal intake manifold. He loves it, thinks it’s the best thing since SEX. He’s running a Stock exaust and stock cam and springs. I think he said he went to 6.5 sliders to bring his RPMs down to 8500. ( I’m sure about the 8500 part not sure on the weights, but he did go to sliders. after we did the BBK and carb, his WOT acceleration was up around 8900 with stock weights. Only change in his CVT was the sliders no one seems to care, but I might mention that he claims the gas mileage sucks now. He rides back and forth to work every day, and he complains he has to “stick his $5 in the gas tank every day!” The trip is about 63 mile round trip,and he often rides it around after work. He takes the river road which is a bunch of stop and goes. i have never even thought about fuel mileage. |
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Post by dexameth on Oct 23, 2018 9:23:52 GMT -5
So what were your times/speeds before/after. I track 0-30 and 0-40 plus top speed after 1/2 mile. Just wondering did you run with the big bore kit before stroking it? If so, what were your times w BBK and w BBK+striker. We just put a striker crank in earsplitingloudenboomer and not seeing any real inprovment. Same top speed and zero to 40 times in the same bracket. Of course we haven’t had time to screw with it much other then getting the jetting right. Just wondering, how did you adjust for the higher piston height? We cut some off the top of the piston and added a thin spacer under the jug. Compression is at 210 psi which is a bit high for my taste on pump gas but we really don’t have any more slack on the timing chain to bring it down. Running a 23 mm carb how and very happy, tried a 24 but no inprovment and harder starting. Thinking of going to partsforscooters and getting the latter intake manifold and larger carb to try. Engine pulls 12,500rpm at top end, very scary to ride up there! ( this from a guy that rides M/C 200 mph most weekends!) I don't race (damnit!) so I don't have timing capabilities and I'm not going to rely on the little cell phone apps for accurate timing. I would love to have had tested each setup I ran. Here's my timeline of engines: 1.Stock 2.50mm big bore 3.50mm with BVH - went 49/17 gearing from here on out 4.50mm domed piston with BVH 5.52mm domed with BVH 6.52mm domed with Hoca head (best on market) 7.52mm stroked with Hoca head (current setup) 205psi when built, haven't re-checked yet I noticed an improvement with each setup, but really never speed rather than from 1-2, and then with the upgear. My 50mm setup got me a flat ground speed run of 58mph ( found here) and that was Scootie's prime. I'm now between 50-52 with the wheelie setup. More power, less speed... must have you scratching your head. I'm always messing with CVT stuff: variator and belt size differences as well as boss length differences. The setup I have now got me 55mph tucked this morning, still pulling wheelies with little to no effort. Back when I had my working tachometer I tried to keep my setup around 7800-8000 for the best powerband, not letting it get past 9k at max speed/max tuck. Anything past is just rpms, no power. I did get it up to 11,800 on the center stand once with crazy awesome throttle response but that was just goofin'. I really wanna change the CVT setup to less of a torque monster and more of a high-speed monster, then throw the Hoca 46/18 gears in there and really see what this little scoot can do. |
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Post by magoconnor on Oct 23, 2018 9:31:42 GMT -5
Hi Ratdog.
Is it a 22mm cvk or pwk carb?
I cant seem to find a 22mm cvk carburetor.
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Oct 23, 2018 12:03:37 GMT -5
They are constant velocity carb, but not made by Keihin.. Jim is thinking about trying to get a CRK to work, but frankly most of our times have been on the slightly bigger Drag bikes. I too would like to get rid of the CV, because I think they are much easier to tune. But then again, do I really want to spend that much money? Also, the smallest carb they make is a 26 mm. I just think these little guys need a lot more cam before we go any bigger
If you can’t find a 22 you like, one of the guys loves the 23 mm he got from scrappydog. He is a pretty much off the shelf 50 mm BBK, no cam, no exaust mods. Just the carb and metal intake manifold
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Post by dexameth on Oct 23, 2018 12:45:10 GMT -5
Scrappydogs is gone...
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