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Motorized Bicycle General Discussion All topics regarding bicycles with engines.

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  #2951  
Old 01-15-2012, 08:07 PM
5-7HEAVEN 5-7HEAVEN is offline
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Default Re: what did you do to your motor bike today?

Quote:
Originally Posted by andrewflores17 View Post
rode my bike to the local park about a 9 mile round trip about half way through realized i should have put something warmer on my head than a ball cap ears nearly froze off brrr
How about a helmet to keep your head protected from the weather and other stuff.

Please ride safe. One of our members fell off his bike on his maiden voyage.....and died.
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  #2952  
Old 01-15-2012, 10:01 PM
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Default Re: what did you do to your motor bike today?

I am not understanding how putting too much oil into your tank could possibly result in a fuel/ air ratio of 50:1.
The engine would not run at such a lean ratio. common ratio is 14.7 to 1.
14.7 parts air to 1 part fuel.
Many modern engines are tuned to run at 15:1, some even 16:1 which is ungodly lean for an IC engine. All in the name of a hotter burn and reduced tailpipe emissions.

Perhaps a 50:1 fuel to oil ratio?
Switching from a 100:1 fuel to oil ratio to a 50:1 ratio certainly would necessitate re-tuning the carburetor as the 50:1 ratio would be heavier than a 100:1 ratio and flow through the fuel ports in the carburetor at a slower rate.
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  #2953  
Old 01-15-2012, 10:46 PM
5-7HEAVEN 5-7HEAVEN is offline
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Default Re: what did you do to your motor bike today?

Quote:
Originally Posted by GearNut View Post
I am not understanding how putting too much oil into your tank could possibly result in a fuel/ air ratio of 50:1.
The engine would not run at such a lean ratio. common ratio is 14.7 to 1.
14.7 parts air to 1 part fuel.
Many modern engines are tuned to run at 15:1, some even 16:1 which is ungodly lean for an IC engine. All in the name of a hotter burn and reduced tailpipe emissions.

Perhaps a 50:1 fuel to oil ratio?
Switching from a 100:1 fuel to oil ratio to a 50:1 ratio certainly would necessitate re-tuning the carburetor as the 50:1 ratio would be heavier than a 100:1 ratio and flow through the fuel ports in the carburetor at a slower rate.
Oops, my bad, lol. You are correct.

fuel/oil ratio.
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  #2954  
Old 01-16-2012, 12:41 AM
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happycheapskate happycheapskate is offline
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Default Re: what did you do to your motor bike today?

I rode my tanaka bike for hours today. I pedaled with a social bike group, ate some tacos for dinner, then motored around through a couple tanks (1/2 gal) of gas to break the engine in and get out of the house a while. The Tanaka33 filter cover fell off. Ugh!
I suppose I will have to purchase another, or figure out a substitute.

Edit: I made a whole filter box from a snuff can and foam . Nothing new to the world, but good enough for small engines.

Scott O has posted links to Daves Motor Sports which has all the relevant replacement parts like velocity stacks, filters, and filter boxes.

http://motorbicycling.com/f51/tanaka...ent-36440.html
Thread about our findings.
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Last edited by happycheapskate; 01-18-2012 at 03:31 AM.
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  #2955  
Old 01-16-2012, 10:28 PM
5-7HEAVEN 5-7HEAVEN is offline
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I rode my bike to town today, about 6 miles. The bicycle chain fell off 3 times, which was kinda strange. After lunch, I was heading home when all **** broke loose.

The chain jammed, then broke the derailleur hanger. This threw the derailleur into the wheel, broke two spokes and the plastic chain guard behind the cassette. Thankfully, the LBS had the right parts. I should have the bike up and running for my commute tomorrow.

Can't wait for sunrise!
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  #2956  
Old 01-17-2012, 02:36 AM
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Default Re: what did you do to your motor bike today?

Yikes, 5-7!
I am glad to hear that you did not crash during the catastrophe!
That was alot going wrong all at once, sorry to hear about it.
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  #2957  
Old 01-17-2012, 03:42 AM
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Default Re: what did you do to your motor bike today?

Quote:
Originally Posted by 5-7HEAVEN View Post
I rode my bike to town today, about 6 miles. The bicycle chain fell off 3 times, which was kinda strange. After lunch, I was heading home when all **** broke loose.

The chain jammed, then broke the derailleur hanger. This threw the derailleur into the wheel, broke two spokes and the plastic chain guard behind the cassette. Thankfully, the LBS had the right parts. I should have the bike up and running for my commute tomorrow.

Can't wait for sunrise!
Suprizes me when you have problems. You work on your bike almost all the time, I don't think there's a better maintained bike on this forum. Of course it has to be. You use it for general transportation, something most don't.

Is it overly complex or is it a case of the bike finding the weak link and breaking it?
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  #2958  
Old 01-17-2012, 06:12 AM
5-7HEAVEN 5-7HEAVEN is offline
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Default Re: what did you do to your motor bike today?

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Originally Posted by DaveC View Post
Suprizes me when you have problems. You work on your bike almost all the time, I don't think there's a better maintained bike on this forum. Of course it has to be. You use it for general transportation, something most don't.

Is it overly complex or is it a case of the bike finding the weak link and breaking it?
The setup is fairly simple. If I could run a #40 chain or better with an internal hub, it'd be more dependable. Dead-on chain alignment, no derailleur, no cassettes, no chain jumping. My next project will have a NuVinci hub, so that might work better. If not, I'll try a Sturmey-Archer hub.

Also, I think I need to doublecheck alignments on both engine and bicycle chains. That might be the cause of most of my chain problems.

The absolute weak link is the light-duty 8-speed bicycle chain. With daily use, it takes the abuse for several months, then breaks. That's what I'm presuming. Thank goodness the Tanaka engine is dependable. The engine's last issue was my fault. I richened the oil ratio, because I simply couldn't take the chance of burning the piston. The fuel/oil ratio raised 2 days ago, when I pumped in 2 quarts mixed @ 100:1 to the remaining quart @ 50:1. Engine is spitting a little oil, but should be fine on the next fillup.

The AVID 203mm brakes are great. The Big Apple tires work well, once I lowered the gearing to compensate for 27" height. No probs with engine or fuel system. The gearbox circlip wears out every 6 months, but that's a 40-cent fix. Gas mileage is excellent @ 125mpg. Power is awesome. Low, midrange and top end is great, as is hillclimbing. Noise is not an issue, even with an expansion pipe. The Diamondback Response bike handles very well.

I save about $5,000 yearly by running this bike. It replaces the "third car" between three drivers on busy schedules. It saves me untold stress by not having to deal with gridlocked traffic. I get free covered parking next to my co-workers, who pay $100-something monthly. If I drive to work, I get to circle the blocks, then park a quarter-mile away in the hot sun, w/bird doodoo on my car.

The shifter cable needs replacing, so I'll fix my bike tomorrow. No probs, becuz I need to work late. Instead of riding home after sunset, my wife and I can carpool for a couple weeks.

No matter how much it costs to fix my bike, car repairs would be 20 times as costly.

And I REALLY like fixing my bike and figuring out how to make it better.
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  #2959  
Old 01-17-2012, 11:33 PM
5-7HEAVEN 5-7HEAVEN is offline
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Default Re: what did you do to your motor bike today?

I bought ANOTHER new rare Tanaka 47R racing engine.

eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

http://www.tanaka-usa.com/Merchant2/...ct_Code=TC-47R

This one was $75 LESS than my first new one. I thought I got a bargain back then.

Last edited by 5-7HEAVEN; 01-17-2012 at 11:49 PM.
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  #2960  
Old 01-18-2012, 01:59 AM
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Default Re: what did you do to your motor bike today?

It's not a motorbike, but I got an old Toro S200 snow thrower today that I'm pretty excited about. I don't know if it works yet, gotta gas it up tomorrow.
This'll be my 1st chance to see if the troubleshooting skills I learned for my china girl will apply to a different motor. Two major differences I already noticed: the snow machine has a pull-start & an ignition key. I've never worked with either, so it should be interesting.
If it doesn't snow soon I'm gonna figure out a way to ride this thing...
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