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Motorized Bicycle General Discussion All topics regarding bicycles with engines.

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  #1421  
Old 05-30-2011, 01:36 AM
ducedave ducedave is offline
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Location: Mentone Ca.
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Default Re: what did you do to your motor bike today?

Road up and down the block to chex the tune all's well-I would like to try a #77 or #78 jet I'm running with a #76 4th clip slot down on the metering rod - I have no drills smaller then a #76 it's fine the-problem is the exhaust-I'm scavenging fine but port blocking and any" back flow " can't remember what that's called, is not good after 7/8 throttle 35mph+ up slight hill a little better down that street
maybe if I crimp down the 3-3/4 out side circumference head pipe just before the muffler body it would help with some back pressure the stinger is tuned good I think the head pipe is the problem at top end
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  #1422  
Old 05-30-2011, 01:52 AM
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DuctTapedGoat DuctTapedGoat is offline
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Default Re: what did you do to your motor bike today?

Was riding down the street and my motor lugged out at a light. Turns out I forgot to put the fine tune clutch cable screw back in when I was dinking around on it the other day, and the cable housing was slipping deeper into the motor's guide slot. So, I adjusted my clutch, greased my chain, and tightened my brakes. Rides like a champ again!
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  #1423  
Old 05-30-2011, 10:04 PM
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mapbike mapbike is offline
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Location: Central Texas
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Default Re: what did you do to your motor bike today?

Quote:
Originally Posted by ducedave View Post
Road up and down the block to chex the tune all's well-I would like to try a #77 or #78 jet I'm running with a #76 4th clip slot down on the metering rod - I have no drills smaller then a #76 it's fine the-problem is the exhaust-I'm scavenging fine but port blocking and any" back flow " can't remember what that's called, is not good after 7/8 throttle 35mph+ up slight hill a little better down that street
maybe if I crimp down the 3-3/4 out side circumference head pipe just before the muffler body it would help with some back pressure the stinger is tuned good I think the head pipe is the problem at top end
Wow #76 - #78 those are some verty small bits (jets)..!

Are you running a 48cc or a 66cc engine?

I went with a #74 on one engine the other day after replacing the NT carb with a different (NT) one, and the engine was way lean on the jet plug run light gray and engine had a bad low end dead spot with no torque at all, I went up to a #72 bit and that got me a nice medium brown plug with the mtering needle clip set second notch from the top, the engie has been ported, port matched, shaved head, SBP expansion chamber exhaust,this may be the reason it needs the jet size it settled in on.

This is were I get my wire gauge bits, they have the replacements for cheap or the sets for cheap and they are good little bits, been using mine for almost 2 years now and they are still nice and sharp.

Link: Widget Supply: Wire Gauge Drills

Peace
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  #1424  
Old 05-30-2011, 10:40 PM
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retromike3 retromike3 is offline
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Join Date: Jan 2009
Location: Beaverton OR
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Default Re: what did you do to your motor bike today?

Today I think I finally got my clutch cable installed correctly. Regardless of how much I seemed to adjust my cable to give it enough tension to disengage, it just didn't seem to work. After installing a new clutch lever(the button broke on my old one) I would pull up to a stop, grab the lever, press the button and my bike would try to walk forward. I finally replaced the cable housing which used to be a brake type with a new index derailleur cable housing. I also made sure that it was cut squarely with the use of a fiber carbide cutting tool and crimped new ends on the housing.

I also replaced the clutch cover which on my new engine that showed the horsepower and displacement with one off one of my old motors. I now have a "clean slate" as it were.

All I did this afternoon was right around the block but I think that I finally solved this particular problem.

mike
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  #1425  
Old 05-31-2011, 01:22 AM
ducedave ducedave is offline
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Join Date: Apr 2011
Location: Mentone Ca.
Posts: 361
Default Re: what did you do to your motor bike today?

Quote:
Originally Posted by mapbike View Post
Wow #76 - #78 those are some verty small bits (jets)..!

Are you running a 48cc or a 66cc engine?

I went with a #74 on one engine the other day after replacing the NT carb with a different (NT) one, and the engine was way lean on the jet plug run light gray and engine had a bad low end dead spot with no torque at all, I went up to a #72 bit and that got me a nice medium brown plug with the mtering needle clip set second notch from the top, the engie has been ported, port matched, shaved head, SBP expansion chamber exhaust,this may be the reason it needs the jet size it settled in on.

This is were I get my wire gauge bits, they have the replacements for cheap or the sets for cheap and they are good little bits, been using mine for almost 2 years now and they are still nice and sharp.

Link: Widget Supply: Wire Gauge Drills

Peace
yep-#76 Suzuki 50cc moped head reed and exhaust pipe port matched on a RAW 66CC nttc carb clip set secant grove from the top 40/1 oil heavy frame cruiser balloon tires 26in. 40psi the play in the magnet is set 1/4 past retard I weigh 195lb. Mentone Ca. 1,500 feet above sea level plug is ngk b-10h medium brown runs strong 35ish up hw38 40+ down climes steep foot hill vary well-60 65 mpg.
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  #1426  
Old 05-31-2011, 01:38 AM
5-7HEAVEN 5-7HEAVEN is online now
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Default Re: what did you do to your motor bike today?

The Tanaka 47R engine's sparkplug has 500 miles on it, but I decided to replace it anyway. Afterwards, I rode to the pancake restaurant where I met my wife and son for brunch. After leaving them, I rode to town five miles away and purchased 2-cycle oil. In order to burn my last few ounces of fuel in my four-liter HT tank, I rode a few more miles to Ala Moana Park, a very popular beach for surfers and picknickers. There is a Festival of Lanterns Event happening this evening. The park was almost full, so police closed off the west entrance that I was approaching. Since traffic was at a gridlock, I hopped the curb, killed my engine and pedalled past the cop and into the park(no response from him). Cruising through the crowded park, I found my favorite tree. It is always available because it's next to the broad sidewalk and faces incoming traffic. There was just enough shade for me to rest for half an hour. Off I went to my apartment getaway, where I watered my plant, picked up my 72t sprocket, freewheel and new crank arm. Having chilled for an hour, I started the eight-mile trek home. I was running on fumes, so two miles into the home stretch, I pulled into a Chevron station, shut the engine off and closed the petcock. After filling half a gallon, I poured in the oil and finished pumping gas. To ensure that the oil mixed well, I pedalled a couple blocks, making sure to run off and on the curbs for more jiggle and slosh. Following that, the Tanaka 47R engine fired up and pushed me home in quick fashion. Top speed of 67kph(41.9mph) was hit in a 56kph(35mph) speed limit zone, but I like to cruise at 56kph(35mph).

Reaching home, there was very little oil mist to wipe down. The tank is full, tire pressure is @ 50psi.

I'm all set for tomorrow's commute to work!

Last edited by 5-7HEAVEN; 05-31-2011 at 01:51 AM.
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  #1427  
Old 06-01-2011, 10:28 PM
chrisme chrisme is offline
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Join Date: May 2009
Location: Maine
Posts: 423
Default Re: what did you do to your motor bike today?

At about 8.30 I got my GT5.
Install went pretty smooth. A lot of stuff I didn't have to deal with. My custom exhaust from the last build, chain length was right, tensioner works, already had sprocket on, handle controls are there... Pretty much just slap the engine on and go.

Only issue was the exhaust stud on the right side of the bike stripped, the annoying one to access. grumble. I think I still have some 6mm rod...
When it was nice and dark out, I had it running.
Fired right up on the very first kick of the pedal. Let it idle a bit, then took it for a short ride up the hill and back down to my garage. Runs pretty well. I'll put some miles on it tomorrow. Hopefully break it in enough I can crack the throttle open a bit and see how the motor does!
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  #1428  
Old 06-01-2011, 10:55 PM
bigbutterbean bigbutterbean is offline
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Join Date: Jan 2011
Location: Lebanon, PA
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Default Re: what did you do to your motor bike today?

I fixed a little problem with my throttle handle. The plastic on the handle where the noodle screws in is broken a little. So I screwed the noodle in the whole way and it stayed tight. I also had a problem with the throttle grip twisting backwards and the cable end coming loose. With the noodle screwed in all the way, it prevents the grip from twisting backwards. So two birds with one stone. I also put the stock throttle spring back in. Test rode it a couple times to make sure everything was ok, including chain alignment, because I had to make some adjustments yesterday to keep the chain on. Everything seems good to go, but this aint the first time I have said that, so time will tell.
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  #1429  
Old 06-02-2011, 12:06 AM
MotorNut123 MotorNut123 is offline
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Join Date: Aug 2010
Location: New York
Posts: 220
Default Re: what did you do to your motor bike today?

Went for a short ride. Hopefully getting a new bike: Huffy Good Vibrations. I think that's what it is. Gonna take a look at it
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  #1430  
Old 06-02-2011, 12:19 AM
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DaveC DaveC is offline
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Join Date: Jul 2010
Location: Boise, ID
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Default Re: what did you do to your motor bike today?

I finally got all the Chinee parts sent off to all that bought them.

Now for that Morini
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