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Post by 90GTVert on Apr 17, 2010 17:40:40 GMT -5
The 50mm cylinder came in today. I got the top end together, then covered it up and cut out a little material to make the tire fit. I'll need to do soemthing different with the air filter using the 120/90/10. It looks done in the pic, but I still need to put the CVT back together and clean the cover.
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Post by 190mech on Apr 17, 2010 19:47:36 GMT -5
Hope it runs as good as it looks!
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Post by Goosey on Apr 17, 2010 20:01:02 GMT -5
That bracket set up on the exhaust, that is what I need. Did you just fit some stainless pieces to the angle you needed and drill it yourself? It looks like the variator tool I was going to put together for my scooter first aid kit. I still need to get the pipe end straightened too. Wrong angle to fit under the plastics in the back.
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Post by 90GTVert on Apr 17, 2010 21:32:24 GMT -5
The bracket was made of 1/4" thick x 1" wide aluminum bar. I used some tubing to cut spacers to fit between the brackets and the engine. Hope it runs as good as it looks! If it's like every other setup I've tried, it won't. It does feel like it's got pretty decent compression compared to some other setups, but I have no fitting to do a compression test for these engines.
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Post by Goosey on Apr 17, 2010 22:06:43 GMT -5
Thanks, will be looking for the aluminum bar. And saving that picture for reference.
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Post by 90GTVert on Apr 18, 2010 11:46:11 GMT -5
I should have known there'd be more issues with the big tire. Grinding and filing the cases was just too easy I guess. The shock is making solid contact with the tire. I didn't do all the other mods for nothing, might as well make it work. I cut the shock's lower mount off and made a new one that's offset a little. I made an extra top mount so the shock will sit farther out there as well. Otherwise the shock was angled kinda bad. I pulled the gas tank off and welded it up, but this pic is before that. I put a quick coat of paint on to avoid rust and that's drying now. Since I just made an extra mount up top and only modded the shock down bottom, I could switch back to a stock setup easily if I needed to. Now all I have to do is tie the filter up or something just to keep the tire from rubbing it and this tire should finally work. It seems like quite a bit of work to go from a 90/90/10 (3.5"W x 16.4"T) to a 120/90/10 (4.7"W x 18.5"T), but at least it's always nice to have something everyone else probably won't bother with.
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Post by stepthrutuner on Apr 18, 2010 14:41:54 GMT -5
Now all I have to do is tie the filter up or something just to keep the tire from rubbing it and this tire should finally work. It seems like quite a bit of work to go from a 90/90/10 (3.5"W x 16.4"T) to a 120/90/10 (4.7"W x 18.5"T), but at least it's always nice to have something everyone else probably won't bother with. Hell, with that meatball rolling back there you probably cudda made it a hard tail. LOL. ;D
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Post by drawkward on Apr 18, 2010 16:29:20 GMT -5
Now all I have to do is tie the filter up or something just to keep the tire from rubbing it and this tire should finally work. It seems like quite a bit of work to go from a 90/90/10 (3.5"W x 16.4"T) to a 120/90/10 (4.7"W x 18.5"T), but at least it's always nice to have something everyone else probably won't bother with. Hell, with that meatball rolling back there you probably cudda made it a hard tail. LOL. ;D Lmao Looks good, can't wait to hear the results.
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Post by 90GTVert on Apr 18, 2010 19:17:34 GMT -5
Not that great, but it works... I just strung a piece of 18 gauge wire across to keep the filter off of the tire. Not exactly professional looking. lol I didn't wanna make an adapter because allegedly the 150cc carbs on 50s don't like anything between the carb and filter. It runs, but that's all I can really say for now. I didn't feel much like tuning it. I adjusted the idle mixture and it idles well. Otherwise, it's outta wack. If you try to open the throttle between idle and 1/8 throttle it makes a sort of high pitched sputter and wants to die. Beyond that you can open the throttle as fast as you'd like. It has an odd bog at throttle positions near WOT. The carb was still setup exactly how it was when it was used the last time with a similar setup other than this one is 80cc and the other was 72cc and of course the new crank. I hope the carb is just way off, because so far it really isn't seeming like a new creation that's made low speed riding a thing of the past.
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Post by 90GTVert on Apr 19, 2010 11:18:56 GMT -5
I tried 95-115 main jets in the 150 carb without much difference between them. I checked for leaks, none. I swapped in the 50cc carb just as it was setup before and it was instantly better. Still crappy, but better. Throttle response is good. I had a top speed of 28MPH with the 150 carb. At least I got over 30 with the 50cc carb. (1/8 mile tests, still pathetic, but not the absolute top speed) There is quite a mismatch from the 50cc intake to the head ported to match a 150cc. I think it is about 4mm off. I'm gonna port the outlet of the 50cc to match the inlet of the head, hopefully gradually. I've also been using a stock carb. I might go back to the modded buterfly I used to use. The really bad news is that even with a new crank, 80cc, big head, long duration cam, and whatever carb setup... it's still the same slow turd it's always been. It's gotta be gearing or something else causing these speeds. I did notice others liking light rollers and I always have to use fairly heavy (7-8g) stuff even at my weight. That's not usually what happens when the engine is making no power.
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Post by 190mech on Apr 19, 2010 11:26:33 GMT -5
Wonder how the final drive ratio compares to the 2 strokes? Lighter rollers may make a difference,allowing the revs to build, be worth a try too..Ya think a CV carb is a must on a CVT engine? How bout a little 'Honda' style slide unit??
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Post by 90GTVert on Apr 19, 2010 12:28:17 GMT -5
I don't think a CV carb is necessary, but I've never tried anything else. All I've got is a 26mm Mikuni pitbike carb around. Trying not to spend any more money, so I'm gonna see what I can do with these carbs and intakes. I did try 7g rollers to start and then swapped to 8g with better results. It may like something else once it's in tune. I think my gearing was 12.5:1 clutch:tire IIRC. It's been quite some time since I checked. I posted over at SD in a thread about dreadfully slow 139QMBs quite some time ago and asked if anyone else could check their gearing for me. No one did. Everyone wants to figure something out... as long as it involves none of their time or effort I guess.
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Post by 190mech on Apr 19, 2010 14:18:21 GMT -5
Seen guys spend a ton on hotrodding a V8 then have it run like crap cause of a 273 rear end..Got some old Honda carbs around, will see what I have tonight...
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Post by 90GTVert on Apr 19, 2010 15:41:42 GMT -5
I ported the stock intake to match the head. The carb is in tune now. I ended up with a 95 main in the stock CV carb with the knife-edged butterfly. The cool part is, my timing light started working as a tach for this thing now. I have no idea why it works now and never before, but it does. I got it out to try and see how far I had advanced the timing by elongating the holes in the pickup bracket some time ago. I had only got about 1 degree advance from what I had done, so I went as far as I could to get about 2 degrees of base advance. I thought, wait... I wonder if it's started working as a tach... I don't remember getting a reliable signal for the timing light before. Sure enough, it actually works now. That's how I tuned for the main jet. I'm pretty sure I know why it's slow now. It doesn't rev. I hit a max of 6,850 RPM in an 1/8 mile with the best jetting. I'm sure it could rev more in a greater distance, but that's pretty bad. I'll try lighter rollers and see what happens. I've never had good luck with them before, but who knows. It definitely needs to rev more than that. I should have enough RPM left for 10-15MPH, if it would act right.
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Post by Fox on Apr 19, 2010 16:03:59 GMT -5
You don't have to have a CV carb. Slide carb will work. I saw a 50cc once with a lawn mower carburetor Frankensteined on it that ran pretty good.
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