what did you do to your motorized bicycle today?

[SlowJoe]

Re: what did you do to your motor bike today?

Made a mount for my iPOD touch to record video. There is a light drizzle here, Maybe it will dry up and I can get a ride in. If not today, Then dry and sunny forecast for the rest of the week.

 

[Sinistar]

Re: what did you do to your motor bike today?

I got my new CDI and Magneto set them up and also made a new exhaust with use of a new Briggs and Straton 6" long muffler 1/2" diameter. inlet used some Home Depot elbows and pipe pieces too make my routing set them with allitle jb weld and I put a piece of wood between my frame and the muffler used mega zipties. The wood works very well to absorb lots of the vibrations and i used some rubber also and its tied in place very securely. I love it and it's so smooth when I ride.

Cheers,

 

[5-7HEAVEN]

Re: what did you do to your motor bike today?

I bought this NOS Diamondback steel cruiser frame for $31 on ebay:

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=200709443729

It has guides for rear v-brakes and 7-speed derailleur.

What a deal!

Hopefully, my 6hp Robin/Subaru OHC engine fits w/little problems. I'm shooting for 29" ROCKSHOX fork, 29" Schwalbe Big Apple front tire, 26" Big Apple rear, disc brakes, 7-speed derailleur and shift kit. If the cassette fails, then maybe a NuVinci hub.

 

[The_Aleman]

Re: what did you do to your motor bike today?

Nice frame, 5-7. However, I don't think those guides are for a derailleur. There seems to be no derailleur mount on that frame.
Looks like guides for an internal hub's shifter cable. Although, one doesn't often see internal-hub bikes with V-brakes...

 

[Skarrd]

Re: what did you do to your motor bike today?

Got a 40t #25 gear in today for the pocket bike jackshaft.

6t-40t = ~6.67:1 reduction
10t-44t = 4.40:1
40t-28t = .70:1
final drive in 1st gear = 20.53:1

should work out for some nice gearing.

 

[DaveC]

Re: what did you do to your motor bike today?

I bought this NOS Diamondback steel cruiser frame for $31 on ebay:

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=200709443729

It has guides for rear v-brakes and 7-speed derailleur.

What a deal!

Hopefully, my 6hp Robin/Subaru OHC engine fits w/little problems. I'm shooting for 29" ROCKSHOX fork, 29" Schwalbe Big Apple front tire, 26" Big Apple rear, disc brakes, 7-speed derailleur and shift kit. If the cassette fails, then maybe a NuVinci hub.

$31 might have been the bid you won at but $92 for shipping needs to be added in, too Is it that expensive to ship to Hawaii? Or did the seller stab you on the shipping? I know that some sellers add their minimum to the shipping but that just seems a bit much

Now, onto my bike

I'm trying to figure out how to position the motor in the frame to measure and make templates for the motor mount plates to be welded to the frame. The lower mount will use the lower mounting holes on the S5 N Morini. They will be welded to the seat post and lower frame wqith the head lug attached to the top bar along with a mount for the expansion chamber. All I can think of is laying the bike on it's sode on a old sleeping bag and use old blankets to position the parts in the right place. I'll cut the templated from some poster board I have and transfer the design to steel to be cut with a plasma cutter.

I'll post in my thread about the build

 

[happycheapskate]

Re: what did you do to your motor bike today?

A lot of low-end bikes use a rear derailleur with its own hanger built in. (usually found on bikes with long horizontal dropouts, using a solid axle).

http://www.niagaracycle.com/images/jbimages/26427sm.jpg

You can get one for $5-15 here (great replacements for kids bikes, clunkers, work bikes, and conversions to rear shifting)
http://www.niagaracycle.com/index.php?cPath=4_5_57_5704&sort=2a&filter_id=&sort=3a

Nice frame, 5-7. However, I don't think those guides are for a derailleur. There seems to be no derailleur mount on that frame.
Looks like guides for an internal hub's shifter cable. Although, one doesn't often see internal-hub bikes with V-brakes...

 

[MEASURE TWICE]

Re: what did you do to your motor bike today?

On my Briggs bike coming together I cleaned out the gunk in the pawl clutch of the recoil starter. Last time I was adjusting the point gap and was testing it, I had not known why it would not start up after one of those loud screeches from the pawl clutch. It was late and all I checked was the spark and there was none. So since it was screeching now and then too often it all came apart and degreased and relubed.

Of course when I took off the flywheel to get to the points after cleaning the pawl clutch, I saw I had two pieces key. Yep enough force from the engine trying to spin the recoil spring tight and throw the pull cord out at me had the key shear. It did so very clean. No scratches on the keyway and I scrounged up another from an old engine lying around. I will keep extras on hand though; the ones for my centrifugal clutch and jackshaft are not the same dimensions.

I also was getting the point gap set right and it usually takes two or three tries. I got it a little better, but at high throttle not smooth and looses power. I made the gap a little wider from last time and will do that again. After that if it gets still better fine. If it gets worse, then I'll go the other way but just very little to zone in on it for best overall running at all speeds. No carb adjustments for the one I have since I switched from the vacujet to bowl type gravity feed from higher tank.

The idle adjust part of my home made throttle linkages I got set so it idles nice. With the final adjust of points, I can get back to hooking up brake and twist throttle cables. The jackshaft and belts try out and give it a ride soon.

MT

One other note, I found that initially putting the cover back on the pawl clutch, had the rubber gasket in upside down. It will not spin smooth that way. The ridge in the gasket faces out as in the middle picture shows.

 

[andrewflores17]

Re: what did you do to your motor bike today?

took mine for a spin had to try out the new cafe racer look i know it dosent realy go any faster but id be lyeing if i didnt say it felt like it did .

everything went perfectly even used the handlebars to get that ultimate streamline look .

 

[5-7HEAVEN]

Re: what did you do to your motor bike today?

Got a 40t #25 gear in today for the pocket bike jackshaft.

6t-40t = ~6.67:1 reduction
10t-44t = 4.40:1
40t-28t = .70:1
final drive in 1st gear = 20.53:1

should work out for some nice gearing.

Interesting combination...pb engine, midframed w/shift kit.

What gears are you running? 7/8-speed cassette? 3-speed internal hub?

FWIW, my gear ratio in 1st gear is 46.32:1. It's like a granny gear for climbing steep hills, and 8th gear is highway gear @ 15:1.

Your 1st gear is 20.53:1.

My 6th gear is 20.45:1, and I'm @ 30-something mph in that gear.

You might want lower gear ratios.

 

[5-7HEAVEN]

Re: what did you do to your motor bike today?

A lot of low-end bikes use a rear derailleur with its own hanger built in. (usually found on bikes with long horizontal dropouts, using a solid axle).

Thanks for the lead, happycheapskate. I'll look into that, as soon as the frame arrives.

Aleman's Quote: Nice frame, 5-7. However, I don't think those guides are for a derailleur. There seems to be no derailleur mount on that frame.
Looks like guides for an internal hub's shifter cable. Although, one doesn't often see internal-hub bikes with V-brakes...

You might be right. I'm glad you guys are here to point things out. I'm not sure myself and will keep researching.

$31 might have been the bid you won at but $92 for shipping needs to be added in, too Is it that expensive to ship to Hawaii? Or did the seller stab you on the shipping? I know that some sellers add their minimum to the shipping but that just seems a bit much

Dave, it is EXTREMELY expensive shipping to Hawaii, but sometimes I get a break. No such thing as free UPS Ground shipping. Some sellers won't even sell or ship to Hawaii buyers. I have a drop point in California. Sometimes it's cheaper to ship there, then reship to me.

I got lucky. I WAS gonna eat the $92 shipping, but the vendor offered to ship via Parcel Post(slow boat), which will cost me $42. Frames are tough, so it should handle bad handling.

For me, $73 for a new steel quality cruiser frame with v-brakes and wide dropouts is my wish come true!

I was willing to be stiffed for $175 for this Diamondback. The new Roadmaster frame w/coaster brake on ebay would've cost me $150.

 

[happycheapskate]

Re: what did you do to your motor bike today?

If shipping is that expensive, and customs allows, you might invest in a small boat with an efficient outboard, and make a side job out of taking packages from the mainland to customers on the islands. $92 ! !!! ouch!

 

[The_Aleman]

Re: what did you do to your motor bike today?

A lot of low-end bikes use a rear derailleur with its own hanger built in. (usually found on bikes with long horizontal dropouts, using a solid axle).

Sure, I'm familiar with those. But that bike pictured never had one mounted, and if you were to mount a hanger like that, you'd compromise the strength of the dropout. That bike pictured is more suited to internal hubs.

 

[Skarrd]

Re: what did you do to your motor bike today?

Interesting combination...pb engine, midframed w/shift kit.

What gears are you running? 7/8-speed cassette? 3-speed internal hub?

FWIW, my gear ratio in 1st gear is 46.32:1. It's like a granny gear for climbing steep hills, and 8th gear is highway gear @ 15:1.

Your 1st gear is 20.53:1.

My 6th gear is 20.45:1, and I'm @ 30-something mph in that gear.

You might want lower gear ratios.

I'm running a 7 speed cassette. i'm gonna switch it to my 34t 1st gear one which will give me 24.93:1 in 1st.

running a 24" tire, that will put me at
1st=17.2 mph at 6000 rpm 34t 24.93:1
2nd= 24.3mph at 6000 rpm 24t 17.60:1
3rd= 26.6mph at 6000 rpm 22t 16.13:1
4th= 29.2mph at 6000rpm 20t 14.67:1
5th= 32.5mph at 6000rpm 18t 13.20:1
6th= 36.5mph at 6000rpm 16t 11.73:1
7th= 41.7mph at 6000rpm 14t 10.27:1

I've heard these motors can reach 10k rpm range, and from the design i've seen i'd say that's rather feasible. the cylinder has 4 transfer ports (two large ones on the sides, and 2 small auxiliary ones opposite of the exhaust port.) not to mention the crank case is amazingly tiny compared to the china girl's crank case.

i'm also thinking that since these little motors put out 3-ish horse power that it shouldn't have much of an issue with running it like this.

 

[5-7HEAVEN]

Re: what did you do to your motor bike today?

I'm running a 7 speed cassette. i'm gonna switch it to my 34t 1st gear one which will give me 24.93:1 in 1st.

running a 24" tire, that will put me at
1st=17.2 mph at 6000 rpm 34t 24.93:1
2nd= 24.3mph at 6000 rpm 24t 17.60:1
3rd= 26.6mph at 6000 rpm 22t 16.13:1
4th= 29.2mph at 6000rpm 20t 14.67:1
5th= 32.5mph at 6000rpm 18t 13.20:1
6th= 36.5mph at 6000rpm 16t 11.73:1
7th= 41.7mph at 6000rpm 14t 10.27:1

I've heard these motors can reach 10k rpm range, and from the design i've seen i'd say that's rather feasible. the cylinder has 4 transfer ports (two large ones on the sides, and 2 small auxiliary ones opposite of the exhaust port.) not to mention the crank case is amazingly tiny compared to the china girl's crank case.

i'm also thinking that since these little motors put out 3-ish horse power that it shouldn't have much of an issue with running it like this.

JMO, I think you're in for a disappointing ride with those gears. You will definitely know this when you're stopped at the bottom of a steep ramp or hill, and try to climb it.

Ask me how I know this.

With a 3-ish hp 10,000rpm engine, you'll be making less than 2hp @ 6,000rpm.

If your engine has 10,000rpm capabilities, you'll be shifting @ 10,000rpm, not 6,000rpm. No one shifts 4,000rpm short of the redline.

My 2.8HP Tanaka 47R engine is rated @ 7,000rpm redline. With the pipe, I'm shifting @ 8,000rpm or a little less. If I'm putting around, I shift @ 5500rpm.

Here's how your gearing works @ high rpm.

First gear.....22.9mph @ 8,000rpm.....28.6mph @ 10,000rpm.
Second gear.....32.5mph @ 8,000rpm.....40.6mph @ 10,000rpm.
Third gear.....35.4mph @ 8,000rpm.....44.3mph @ 10,000rpm.
Fourth gear.....38.9mph @ 8,000rpm.....48.7mph @ 10,000rpm.
Fifth gear...43.3mph @ 8,000rpm.....54.1mph @ 10,000rpm.
Sixth gear.....48.7mph @ 8,000rpm.....60.9mph @ 10,000rpm.
Seventh gear.....55.6mph @ 8,000rpm.....69.5mph @ 10,000rpm.

You will run out of road in second gear.

In comparison, here's my gearing @ 7,000rpm redline and 8,000rpm:

First gear.....12.1mph @ 7,000rpm.....13.9mph @ 8,000rpm.
Second gear.....15.9mph.....18.1mph @ 8,000rpm.
Third gear.....17.9mph.....20.5 @ 8,000rpm.
Fourth gear.....20.6mph.....23.6mph @ 8,000rpm.
Fifth gear.....24.3mph.....27.7mph @ 8,000rpm.
Sixth gear.....27.5mph.....31.4mph @ 8,000rpm.
Seventh gear.....31.7mph.....36.2mph @ 8,000rpm.
Eighth gear.....37.5mph.....42.8mph @ 8,000rpm.

 

[GearNut]

Re: what did you do to your motor bike today?

I smashed it many times with a hammer!





Well..... maby they were carefully placed blows on the left edge of the rear fender with a 10oz ball peen.

 

[Dan]

Re: what did you do to your motor bike today?

LOL GN. I think we all have had occasion to do some "smash meditation" Even if it does not work, ya do feel better for several seconds. Right up until ya consider the cost.

C'mon, tell the truth, did ya beat that fender in to submission?

 

[happycheapskate]

Re: what did you do to your motor bike today?

I politely disagree. The derailleurs with integral hangers brace against the dropout nicely, and the anti-rotation pin can couple with a top-hat nut (usually come with them) or conventional nut and washer, behind the dropout. You do not have to drill a hole in the dropout for the anti-rotation pin. If you have a good eye and steady hand, you can weld a hanger tab on any standard dropout. I put one on a BMX when I was a kid, and made a 7speed BMX chopper that worked nicely.

http://cdn.schwinnbikes.com/catalog/product/cache/55/image/457x300/9df78eab33525d08d6e5fb8d27136e95/s/_/s_2011_S4032_slv_13.png
New Schwinn Wayfarer 7speed cruiser with integrated-hanger r.d.

Sure, I'm familiar with those. But that bike pictured never had one mounted, and if you were to mount a hanger like that, you'd compromise the strength of the dropout. That bike pictured is more suited to internal hubs.

 

[Ibedayank]

Re: what did you do to your motor bike today?

5-7heaven

you prolly have this frame and its a 7speed

 

[The_Aleman]

Re: what did you do to your motor bike today?

I politely disagree. The derailleurs with integral hangers brace against the dropout nicely, and the anti-rotation pin can couple with a top-hat nut (usually come with them) or conventional nut and washer, behind the dropout. You do not have to drill a hole in the dropout for the anti-rotation pin. If you have a good eye and steady hand, you can weld a hanger tab on any standard dropout. I put one on a BMX when I was a kid, and made a 7speed BMX chopper that worked nicely.

Only generic multispeed bikes use that method, always with generic derailleurs, too. The bike you linked to is a generic as well. Bikes properly designed for derailleurs have the right provisions from the get-go.

One of these will work with proper derailleurs on generic bikes, tho:

http://problemsolversbike.com/products/universal_derailleur_hanger/