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Post by drc174 on Feb 5, 2017 23:32:52 GMT -5
Where di you get the gas tank.. valve thing from? the purple thing. me want many of those
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Post by 90GTVert on Feb 6, 2017 8:26:21 GMT -5
I'm suspecting the petcock or something is making the flow too low. Does anyone know what that flow should be? Next time I get a chance I'll start working my way back on the fuel line. There are several places that could be suspect. The petcock was a 1/4" nipple and the carb was 3/16" I put in a step down from parts at Lowe's. Here's what I got testing my Roketa with 3/16" hoses. I removed the fuel hose from the carb and let it drain into a graduated container for exactly one minute. Flow looked sufficient to me, though it seemed slower than what I'm used to from some other scoots. 160ml drained in 1 minute. That converts to 9.6l/hr or 2.54gal/hr or 16.1lb/hr. I don't exactly know the BSFC of these engines, but that sounds like more than enough to me. Then I thought perhaps the routing of the fuel hoses is hurting flow, since for the test I had it nearly straight down from petcock to container. I put a smaller graduated container in position so the hoses were routed as close as I could get them to how they are with the carb. Then I got 140ml/min or 8.4l/hr or 2.22gal/hr or 14.1lb/hr. Down a little, but it still seemed like more than enough fuel for less than 10HP. I even tried draining through the float bowl drain hose directly to see if that changed. It did drop another 5ml/min, but I think that was due to my error trying to get everything positioned and I probably lost a bit.
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Post by aeroxbud on Feb 6, 2017 11:07:40 GMT -5
What a cool project. I like your idea of just keeping it as original as possible. This is a truly great find you have there.
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Post by pinkscoot on Feb 6, 2017 14:27:34 GMT -5
Where di you get the gas tank.. valve thing from? the purple thing. me want many of those It is a great petcock for this kind of tank. On the Derbi I made a Rube Goldberg set up with hardware from Lowes but this is a much cleaner petcock.
Here is the link.
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Post by pinkscoot on Feb 6, 2017 14:33:10 GMT -5
Sounds to me like it is lean. Is the airbox possibly letting too much air? MJ sounds kinda small to me. I have always wondered why all the stock carbs on my Morini engines have main jets in the 50's and 60's. I'll try going to something in the 70's and working my way back. The foam filter I used may be more open than the stock and that would do it. I'll also recheck my attachment of the air box to the carb, it felt pretty solid but you never know.
I'll also confirm that flow just to be sure.
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Post by pinkscoot on Feb 6, 2017 14:34:54 GMT -5
What a cool project. I like your idea of just keeping it as original as possible. This is a truly great find you have there. There are a number of these scoots in England, you should keep an eye out.
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Post by drc174 on Feb 6, 2017 19:01:01 GMT -5
Where di you get the gas tank.. valve thing from? the purple thing. me want many of those It is a great petcock for this kind of tank. On the Derbi I made a Rube Goldberg set up with hardware from Lowes but this is a much cleaner petcock.
Here is the link.
Crap I was hoping you found a cheaper version that the Malossi one, hah! The last malossi I mounted wasnt purple, therfore the confusion
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Post by pinkscoot on Feb 17, 2017 20:30:30 GMT -5
I finally was able to work on the scoot today, between work and a bad knee its been hard to spend much time working on scoots. I took Old Geeks advice and put the 76 jet that came with the carb in and the idle jet that came with the carb. It runs great, for a stock scoot its pretty peppy. I'll take it for a ride tomorrow and see where it is.
I took advantage of Treatlands 14% off and bought a set of Sava B14 White Walls for it. They will add to that classic look.
I researched them some and they had mixed reviews, people loved them and people hated them and generally there was lots of flaming about them. Its amazing how rude people are on other forums. Some would call it passion but I see it as know it allness.
Time to go back to the Derbi and get it tuned in so I can annoy my neighbors.
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Post by pinkscoot on Aug 28, 2017 19:09:21 GMT -5
I can't believe it has been 6 months since I posted on this scoot.
While I was limping around I discovered that I had a gas leak from leaving the valve open and decided to address it. I got it on the lift with a catch basin and opened the valve and nothing. Left it there while I poked around and nothing, hmmmm, can't fix what I can't find. I then decided to try and see what the best plug is for it. The manual says BP8HS and BP7HSA depending on where you look. NGK Says an BP6HS. Italjet.UK.com sells a BP7HS for it. The 6 seems a little hot so I'll compromise with the 7. Then I changed the gear oil, I had missed changing it when I got it so it was in need. 20 year old oil is never a good thing. Of course you need to pull the CVT cover to drain and fill. I hate the drains that go into the CVT and the fills that are sideways, gravity doesn't work that way. The oil that came out was a dark gray green gunk. It was time to change. While the CVT cover was off my neighbor saw how clean it was and kept saying it looked brand new, well it is a 20 year old new scooter. The tires got fresh air and away I went. It runs well for 50cc stock scoot. Its a little buzzy and I need to chase that down I have new tires to go on and be balanced to some of the out of weight feel will go away. Tomorrow I'll work on the speedometer and the handlebar cover. Then It will be one of my daily short distance riders.
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Post by pinkscoot on Sept 4, 2017 11:05:41 GMT -5
On Tuesday I started it and it would idle for a bit then die. I played with the idle screw and nothing. The gas was low so I figured that was it. Got gas and it was still having problems. Work got in the way until yesterday. I decided to pull the carb and give it a cleaning, it had sat for a few months and that could have been it. Of course that means pulling the fiberglass back off of it. Not a big chore, its 1 piece with 6 screws for it and 4 for the seat and bucket. Got the carb out and saw that I had zip tied the air box on because I didn't have a clamp large enough and was going to replace it the next time I was in there. Well still no clamp so I zip tied it again and hopefully will get that clamp. When I went to pull the A/F screw I screwed it in so I would know where it was, 3 1/2 turns out. That seemed pretty lean but it had to have worked when I tuned it last spring. I thought about a larger pilot jet but decided that 3 1/2 turns wasn't too bad. The jets were clean the float was good. I did have that issue where the carb had drained the tank over the summer. I put it all back and started it. Still the same problem so I put my hand over the air intake and to purred like a kitten but idled fast. Turned the idle down then went to work on the A/F screw. It ended up at about 2 turns out and purrs like a brand new scoot.
Next on my list while I had the fiberglass off was to make a license plate holder. I had some ABS plastic to use. I made a paper template and taped it to the plastic and spray panted around it and got my plate. I am really rusty with a jig saw maybe its time to invest in a band saw, those I am very good with. Its not my worst job but fortunately the plate hides it. No pictures because I'm too embarrassed. Its better than zip ties and a spot hose so it won't rub the paint.
Next up the speedometer and the handlebar cover. I had been having trouble getting the cover off but while working on the back I saw that the front turn signal stalks were bolted to the bottom and gave it a try. Magic, off it came and gave me access to everything I needed. The top of the speedo cable was pulled out of the fastener and had been held in by a hose clamp. I pulled the other end free so I would have some slack and got it reconnected. Then I fen the whole thing back down and got the bottom bolts in as well as the new top bolts I got from McMaster Carr.
Took it for a ride and all was good got it up too 35 indicated which is plenty fast for the skinny little wheels. The brakes felt soft and I thought maybe they needed and adjustment but no they were tight and the best I would get from brake drums. I need to het my phone mount on it so I can check the speedometer and see how far off it is. Well today will be a cleaning day for the scoot so that it shines when I ride it around town.
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Post by pinkscoot on Apr 12, 2020 17:15:08 GMT -5
I haven't posted much about the scooter but in my quest to get all of them running and looking good it went on the lift. I had bout new tires for it a while ago. The original tires looked good but the front one had a leak. I think 22 years is a lot to expect from a set of tires. I started with the front one. I looked at it and saw a very intricate suspension. No just pulling the axle bolt and dropping the tire, here is a picture:
This was involved. All of the nuts were unlocks so that was fun. I got it off and then spent a bit of time breaking a 22 yearly bead. I tried the breaker bars Brent recommends, a vice, c-clamps and nothing I tried cutting it off and nothing. I then used the WD-40 trick. With some persuasion it came free. Then came installing a tube. I tried 3 different ways but the 90deg valve stem just wouldn't go in. I tried a 4th of putting the tube in the tire putting air in to get it right the pulling the valve stem. It went together great. I made mental notes for the rear one. The rear had its own issue, they originally put 8" wheels on these but upgraded to 10" on my model year. The only problem being that the lower exhaust mount doesn't allow it to come off easily, here is a picture:
Not sure if you can see it but it's blocked by a good inch. I pulled the valve stem to get the air out, then used a pry bar to flatten the tire in the area and worked it out. The rest went well. I cleaned everything up and took it for a ride. I got about 2 blocks and it died, oh sh*t what now. It wouldn't start. I looked in the fuel tank and it was dry. Whats with me and not keeping the tank full. I took it to work to check the building and got these shots:
I'm normally not a fan of whitewalls but on this scoot it works. I rode it around and got some and got lots of looks. I stopped at and Airstream college shop and there were two guys there, one old Harley guy and a young Ducati guy, they have seen a couple of my other scoots with no comments. They saw this and couldn't stop talking about it and asking questions. I think they got a new appreciation for scooters. One thing I will say is that this scooter is really quick to 30 and doesn't loose speed on hills but 30 is its limit.
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