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Post by phaze on Apr 2, 2009 5:51:27 GMT -5
usf, a baby blue scoot lol good thing your a marine lol. the scoot sounds cool and you have a talented welder there good luck
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Post by gy6rocket on Apr 2, 2009 7:17:52 GMT -5
That's awesome man, sounding good! When I saw your other thread I didn't know you were making a straight pipe. That fits the retro very well.
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Post by usfmarine on Apr 2, 2009 10:38:24 GMT -5
Phaze: Is it more manly if I call it sky blue or powder blue? I figured if I was getting a scooter, I better make it memorable  Now it sounds like an angry baby blue hog! Thanks gy6rocket. I can't wait to take it out on the road and watch the horror on people's face when they realize that the loud Harley sound is coming from the baby blue scooter. You should see the reactions I get already here on the base. |
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Post by kink on Apr 2, 2009 12:46:37 GMT -5
Looks like part of the valve assembly might have snapped off and made it's way into the cylinder...
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Post by xs650 on Apr 2, 2009 13:57:10 GMT -5
Phaze: Is it more manly if I call it sky blue or powder blue? I figured if I was getting a scooter, I better make it memorable Now it sounds like an angry baby blue hog! Definitely "Powder Blue", just drop the d in "powder" when you say it. ;D |
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Post by dogmeat on Apr 2, 2009 16:43:43 GMT -5
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Post by d on Apr 2, 2009 17:03:25 GMT -5
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Post by kliff on Apr 2, 2009 17:29:55 GMT -5
I will double-check that when I pick it up. I believe he is using the same bracket support that was being used by the stock exhaust. Those should be ok right? COOOL! Glad I was wrong. Carry on Marine. |
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Post by earlwb on Apr 2, 2009 17:44:44 GMT -5
Nice tubes and curves there. I usually have the scooter there along with the welding equipment. So I can bolt on the flange and muffler (if any) and then tack weld the tubing in place and or cut and grind and bend if needed. Then carefully remove it and weld the heck out of it all.
it has me curious as to how such a big chunk of metal got inside there. it is too big to get past the valves or spark plug hole.
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Post by kczukiman on Apr 2, 2009 17:56:30 GMT -5
USF,I recon you may have to make a deal with your exaust man,because I'm sure there will be plenty of dawgs wanting one  Very nice job! |
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Post by kliff on Apr 2, 2009 18:13:33 GMT -5
it has me curious as to how such a big chunk of metal got inside there. it is too big to get past the valves or spark plug hole. It's the head off of the exhaust valve....that's what is meant by "dropping a valve." The head disconnects from the stem, and does all kinds of nasty things in the cylinder. Most OEM valves....not SS, are 2 piece valves. The head and the stem are "friction welded" together. And sometimes that weld breaks... |
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Post by shookupart on Apr 2, 2009 23:06:20 GMT -5
all around great mod with the sound to back it up. killer!!! I really like it. Wheels are spinning in my head about how to translate this to my scoot. GREAT JOB
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Post by usfmarine on Apr 3, 2009 10:08:28 GMT -5
it has me curious as to how such a big chunk of metal got inside there. it is too big to get past the valves or spark plug hole. It's the head off of the exhaust valve....that's what is meant by "dropping a valve." The head disconnects from the stem, and does all kinds of nasty things in the cylinder. Most OEM valves....not SS, are 2 piece valves. The head and the stem are "friction welded" together. And sometimes that weld breaks... I believe you have the most likely theory right there. I wanted to talk to the mechanic more about his busted ss head and cylinder but he only spoke a few words of English. Oh well, performancescoot is sending him gently used parts for CHEAP, he's getting the hookup. |
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Post by usfmarine on Apr 3, 2009 10:09:43 GMT -5
I go to pick up the scooter today. When I test drove it yesterday, it was bogging a little from 1/4-3/4 throttle with everything stock except the exhaust. I hope I can make it home over some big hills.
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Post by usfmarine on Apr 9, 2009 0:19:50 GMT -5
My UNI sock air filter finally arrived. Here it is!    I bought 3 jets from KS Power with this 28mm Mikuni flatslide. They put a 90 jet in the carburetor for my initial setting. They sold me a 105, 110, and a 115. Well, what I actually needed was a #130. And that's what I bought locally this afternoon. So some have asked what the results are after throwing out my stock exhaust, air box, and upgrading to a 28mm Mikuni flatslide. Without touching the tranny, my top speed has increased by 6-8mph. I now have a top speed of about 62-64mph in Chinometers. More impressive than that, I have torque out the wazoo. A headwind of about 10-15mph used to slow down my scooter to 50mph max speed. Now even with a decent headwind tonight, my top speed did not change. It was a weird feeling. The throttle response is just sickening on this flatslide. It feels like I have a supercharged scoot now. When I crack this bad boy open it just takes off. I do have a flat spot in the throttle at about 25-35%, I believe a slight A/F mixture adjustment will cure that, or one needle clip position change. I heard that many people could not get this TM28 flatslide dialed in. To be honest, I started with a #130, turned the A/F mixture a few turns and adjusted the idle and BAM, I was done for the most part. Took approx 5 minutes of tuning. I couldn't be happier. I don't know why anyone would say a 28mm flatslide would be too large, it seems "just right." Oh ya, I spent a little time porting out my intake manifold. It had a sharp 90 degree angle on the inside of the bend. I use a $8.99 generic dremel from Harbor Freight. Used a small grinding stone and took a little off, ran my finger over it, etc etc until I was happy with it. I didn't take much off, just smoothed it out. Also, the choke is completely unnecessary for this setup. Without using the manual choke on the TM28, it starts right up instantly. AWESOME. That was my primary concern until now. These are the upgrades I have done: - electric fuel pump 2-3.5psi - Facet cube (removed fuel psi regulator) - Airbox removed, replaced with UNI sock air filter. - Stock muffler/pipe removed, replaced by new flange/1.25" mandrel bend pipes, tapered stright pipe, no muffler. - Replaced stock 24mm CV carb with a 28mm Mikuni TM28 flatslide carb. I've learned a lot of little things while doing this initial series of performance mods. Everything from soldering a new throttle cable, engineering the air filter around the frame (UGH!), and mildly porting out the intake manifold. One more photo of my exhuast!  |
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Post by tp555 on Apr 9, 2009 5:53:52 GMT -5
We want a vid.
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Post by kliff on Apr 9, 2009 6:07:15 GMT -5
Yo, Marine!
Excuse me for being blunt, possibly rude....but you're missing a sustantial "chunk" of cooling shroud around the cylinder head, above the intake port. That will cause overheating man. I wouldn't ride it without a good shroud in place.
PS.... what is with the carp coming out of the valve cover? That thing seals with an "O" ring...
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Post by scooter3oy on Apr 9, 2009 8:12:56 GMT -5
usfmarine, actually "try" to get a bog from idle....like twist the throttle to complete WOT as fast as you can from a dead stop...just curious to see what your experience is
and like it's been said many, many times before, all of these scoots are slightly different, and people's riding environments can be radically different, so what works great for some may not work well for others....if there was a 100% guaranteed detailed part by part path to success for everyone, this forum would probably have like 10 posts total ;D
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Post by jamescell on Apr 9, 2009 8:28:04 GMT -5
Yo, Marine! Excuse me for being blunt, possibly rude....but you're missing a sustantial "chunk" of cooling shroud around the cylinder head, above the intake port. That will cause overheating man. I wouldn't ride it without a good shroud in place. PS.... what is with the carp coming out of the valve cover? That thing seals with an "O" ring... Its funny, mine broke in the exact same spot! |
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Post by usfmarine on Apr 9, 2009 9:12:45 GMT -5
I figured it being broken off would actually improve cooling. I thought i've ready that many people have taken off the shroud completely. Or am I confused?
As far as the valve cover, the stuff that looks like it is oozing out is indian head shellac. I had an oil leak that a local mechanic fixed for me, so he shellac'd the heck out of the valve cover and the head gasket. It is now fixed, i'm not complaining.
Kliff, am I really at risk of overheating? Except for replacing that piece of shroud, what can I do to ensure the scoot stays cool.
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Post by xs650 on Apr 9, 2009 10:29:28 GMT -5
I'm not Kliff, but yes, you need that hunk of shroud.
You can also get some small increase in cooling by removing that chrome plastic cover over your fan. It partially blocks the cooling air intake. Every little bit helps.
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Post by howlnwoof on Apr 9, 2009 11:36:28 GMT -5
Marine, you just about have me convinced to go ahead with that Mikuni 28FS. I'm jealous of the throttle response. I don't know if I can wait another 6 weeks to do mods. Good job!
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Post by usfmarine on Apr 9, 2009 14:21:36 GMT -5
wonder if anyone sells the top piece of the cooling shroud for this ZNEN-manufactured scoot.
If I can get a buddy to hold the camera, I'll take some video this afternoon of me ripping it wide open. I'm sure my neighbors won't appreciate that on our quiet street.
Scooter3oy: I will try to get that idle -> WOT bog that you refer to. I have a feeling it isn't going to have it though. This Mikuni flatslide is awesome.
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Post by kliff on Apr 9, 2009 14:33:50 GMT -5
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Post by usfmarine on Apr 9, 2009 14:46:30 GMT -5
Holy shnikies, that is cheap. I'm gonna look for the broken off piece though and try to super glue it first. I've been riding it broken like that for months; no problems to report. But you're the expert, I should probably just follow your advice |
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Post by phaze on Apr 9, 2009 18:38:12 GMT -5
marine your not gonna paint that scoot? i'm seein it in marine issue camo, hell go to the motor pool they have everything you need. tell them your on a site with a boatload of taxpayers and we said hook you up, or you could do it to match your dress uniform that would be sharp.
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Post by 2btiger on Apr 9, 2009 19:05:21 GMT -5
marine your not gonna paint that scoot? i'm seein it in marine issue camo, hell go to the motor pool they have everything you need. tell them your on a site with a boatload of taxpayers and we said hook you up, or you could do it to match your dress uniform that would be sharp. Matching his dress uniform would look very smart, very smart indeed.  |
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Post by usfmarine on Apr 9, 2009 19:20:21 GMT -5
I can't even ride this scoot with my dress uniform on because the USMC orders us to wear over-the-ankle boots whenever we are on a 'motorcycle.'
I'm definitely not going to paint it with any camouflage pattern. I bought it for that sky blue color! I used to think I got a lot of attention riding on base by virtue of its color and style. But now that it sounds like a straigt-pipe Harley, EVERYONE is staring at me and laughing. It is really quite funny. I have a grin on my face for my entire commute.
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Post by xs650 on Apr 9, 2009 19:29:01 GMT -5
I bought it for that sky blue color! I used to think I got a lot of attention riding on base by virtue of its color and style. But now that it sounds like a straigt-pipe Harley, EVERYONE is staring at me and laughing. It is really quite funny. I have a grin on my face for my entire commute. Sure beats the old one finger salute. ;D |
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Post by usfmarine on Apr 10, 2009 9:59:34 GMT -5
Two questions for you carb experts.
1. After riding for a few miles at or near WOT, the scooter doesn't like to slow down to idle. I apply the brakes in order to slow down the scooter, but even then, the RPMs are elevated until I am motionless for a minute or so. Then the RPMs drop down to normal idle levels.
2. This is an intermittent issue. When I am slowing down from 15mph steadily decreasing to 0mph I sometimes hear a weird click (sometimes it happens when idling). Never heard this before. Kinda sounds like an airy click that can make the scooter very slightly lurch. It is noticeable, but it does not affect ridability, I just want to know what this is. I thought it might be a little rich, so I leaned up the air/fuel mixture a little, that had no effect on this intermittent 'airy click." Is this a backfire in the carburetor? Is it bad for the carb?
Other than those two things, the setup is perfect. I hit 65mph (Chino-MPH) last night; wicked.
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Now it sounds like an angry baby blue hog! 
Roketa MC-60 
Tiger Cub