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Post by 90GTVert on May 2, 2013 8:20:44 GMT -5
As long as it's all tuned right, it seems to hit whatever RPM it's tuned for and not move until I let off with the lighter flywheel and the OR kit. Cruising may be an issue if it does get worse. To be honest, I don't care too much right now. Just wanna see what it does with the gears and it's basically a toy scooter anyway. If it's not right, I'll either get it straight or let it collect dust again while I work on something I'll ride a lot. Loud, more maintenance, poor fuel economy, draws lot of attention vs my other 90-100s that are relatively quiet, easier to maintain, get better gas mileage, and don't cause so many ppl to stare or make me nervous around cops.
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Post by 90GTVert on May 2, 2013 14:36:12 GMT -5
I've been filling stuff with fluid and doing some math. I've got 2 heads in front of me. 1 from this engine, another from the Venus' engine that was also opened up. This one has a lip, the Venus' head does not.
Looks like with the head that's been on the engine I would have 10.5:1 uncorrected compression ratio and 6.2:1 corrected compression ratio. With the head from the Venus, I'd have 12.9:1 uncorrected compression ratio and 7.3:1 corrected compression ratio.
Haven't checked squish yet.
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Post by 90GTVert on May 2, 2013 15:24:05 GMT -5
With the head I was using, I'm seeing 2mm minimum squish clearance. With the Venus' head, 0.9mm. I'm gonna stick it together with the Venus' old head and see what happens. I'm afraid it's gonna spark knock since this setup hasn't liked much compression in the past, but time will tell.
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Post by 190mech on May 2, 2013 19:30:14 GMT -5
We are all ears!Hope there is no spark knock...
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Post by 90GTVert on May 2, 2013 19:44:42 GMT -5
It'll be a bit. Thought I was gonna get it closer to running, but some other stuff popped up. It's just bolted in right now. Got a few more things to bolt on and I need to clean the carb before it goes back in and prob go up 1 main jet size. Hopefully I'll be pissing off the neighbors sometime over the weekend anyway. lol
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Post by 90GTVert on May 3, 2013 15:28:38 GMT -5
The good news is, it's not exactly sluggish and struggling to get on the pipe...  Once it spins a little and gets just a bit of heat, I have a helluva time getting it to spin again. It leaves about 3" wide marks and you put 300lbs over that and it doesn't wanna spin too much. Once it leaves the garage.... not so fun. I made it about a mile and a half and then eased off and it died. Re- started, turned around, another mile... died at low throttle/letting off. Got it home and it would die out at idle somewhat randomly. It also started leaving drops of fuel under it. Thought I had the fuel issue fixed. I set the float in the past, and then I found the cracked fuel line the other day. I guess at some point I'll clean the carb again and look at the float while I'm in there. Another small bit of good news, I haven't heard it knock yet. Then again, I haven't held it open long. |
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Post by 90GTVert on May 4, 2013 14:44:49 GMT -5
I cleaned the carb thoroughly and re-installed it and it seems to have stopped leaking. Before I took it out for a test ride, I moved the throttle slowly to see how it felt. Somewhere just over 1/4 throttle it would try to die out if I held it there. I moved the needle clip up a notch and it cleared that up. Took it for a 10-15 mile ride without it dying out or doing anything weird. Not hearing any spark knock.
I'll switch this thing back to 10.13:1 gears whenever I mess with it next. I expected a lot more from the 13.55s, but all I really got were easier burnouts and it may be slightly faster just off the line.
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Post by aeroxbud on May 4, 2013 17:37:28 GMT -5
Sound alright  If your not really gaining much, might as well run the higher gearing. |
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Post by 90GTVert on May 4, 2013 19:48:15 GMT -5
The main thing I gained is power off the line. I will say it's pretty cool that it just pushes the front tire and tries to go when I try to do a burnout. Prob the most I've ever tested the Michelin Bopper. I had the cam on, but I doubt it's anything really cool. I was trying to do rolling burnouts in the garage, but failing at that cause it wanted to hook too bad. lol Have to leave that to the pros (2strokd) I guess. I'll prob upload what little I recorded of that anyhow. I lowered the front and it looks good... but the forks are hitting the headlight now when I try to turn much.  |
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Post by 90GTVert on May 4, 2013 21:07:45 GMT -5
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Post by 2strokd on May 6, 2013 8:01:15 GMT -5
Sure looked fun!
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Post by oldgeek on May 6, 2013 19:51:44 GMT -5
I wanna do that so bad...Maybe one day!
Just keep riding,
Scott
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Post by stepthrutuner on May 7, 2013 1:15:34 GMT -5
Okay. Now I'm ready for a good RBB smackdown to some town smart ass youngster on his piped fiddy.  |
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Post by 90GTVert on May 7, 2013 6:44:13 GMT -5
Would be fun, but the way my luck is I'll find someone to race when I'm on the stock GY6 instead.  |
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Post by 90GTVert on May 26, 2013 21:37:47 GMT -5
Needed pics for something I'm trying to get together for the tech section, so that was enough motivation to finally swap the gears back to 10.13:1.
Moved to 1/2 gram lighter rollers to see if RPM will rise up a little. I've got mild flat spotting on the rollers. I was hoping with Dr Pulley 19x15 rollers in the OR variator that it would not be such an issue. I don't ride enough on this scoot that I expected to see that. I'd like to try sliders and see how they work in the OR at some point.
The front end contact from lowering turned out to be the forks hitting the Wolo horn. I raised the front back up just slightly and rotated the mount for the horn just a bit. Looks like it'll be OK now.
Just gotta bolt the exhaust back on and see how it does.
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