West Coast Chopper Build

[zzirrgrizz]

Here is my current progress of my west coast chopper build. I painted it matte black with plasti-dip (besides the parts I plan on welding to and I dont have all the coats on yet that is why it is so uneven). I reupholstered the seat with an old Hurley shirt because the seats "leather" was ripped up. Came out pretty nice. I finally got the back sprocket attached which has 62teeth. Tell me what you guys think so far please or any feedback on what could be better or what you think I need to do. I am quite new here btw

UPDATE 3/22/15
Well I haven't posted on here in while but here's quick update. I got the motor on pretty easily. All I did was cut slits in the main tube coming off the handlebars, bent it, and put a few tacks in to give it it's strength back. Then I pretty much just hack sawed a piece out of the bottom bracket thing and welded in my engine frame...then BOOM

Anyways as for power goes I stuck with the 2HP motor and am doing just fine with it! It is a little bit of a dog uphills (but hey that's the price I pay for 30 dollar motor!) Other than that it's pulling me pretty easily I just have to give it a little push with my feet if I'm coming from a totally dead stop.

I still need to smooth out the edges, add some brakes , and finish it's paint job then....WHALA!

 

[zzirrgrizz]

However, I have been running into a dilemma. I bought a 2hp Briggs and Stratton for it. I have a clutch and everything for it as you can see but I need to know how I can increase its horsepower. My clutch has 11t and my sprocket has 62t. I know this gear ratio might be a recipe for disaster for my clutch I know I could increase my engine size but I don't want to because if I do it wouldn't be legal to ride in the bike lane where I live. I also cannot add a jackshaft. Too long to explain xD just don't ask lol! Soooo....Are there any safe ways to increase my horsepower? Maybe like:

1. New, higher flow exhaust?
2. Removing governor/adjusting it (this is what I heard but idk if it is safe)
3. New spark plug
4. Maybe some type of fuel I can add?
5. New air filter or maybe drilling some holes in the air filter housing to increase air flow


Any advice is greatly appreciated guys I am really stuck

EDIT: By the way guys I will not be moving from a dead stop. The bike is very lightweight and so am I (I am only around 110lbs) so I will be pushing with my foot like once or maybe twice if it needs it, to get the bike rolling first. I think this may help a little cause the bike is actually very light for the most part and easy to maneuver. I can probably get it moving around 10ft per second easily just by pushing off (or around 6-7mph)

 

[supermanotorious]

I love these conversions, thinking about doing one to a 1953 Schwinn Corvette but hard to say because it might be pretty valuable as it sits.

 

[Poboy kartman]

Get a 6.5 Predator.....do all the mods you can find on this forum.....strip the decals off and repaint it........

Then go to a local lawn and garden shop......buy all the decals for a 2 hp Briggs and Stratton......done!!!!!!

Probably can't get any performance parts for the 2 hp.....but all the mods like porting....better exhaust and air filter, removing the governor....thinner or no head gasket.....all apply to the 2hp.....just lkke they do the larger engines.

 

[zzirrgrizz]

Then go to a local lawn and garden shop......buy all the decals for a 2 hp Briggs and Stratton......done!!!!!!

As fun as it sounds break the law xD I think I am going to stick with my 2hp xD! But on the serious note if I did remove the governor/adjust it, new exhaust, drilled holes in air filter housing, etc. how much hp you think I can get up to?

 

[zzirrgrizz]

I love these conversions, thinking about doing one to a 1953 Schwinn Corvette but hard to say because it might be pretty valuable as it sits.

If you do convert it I would recommend using the kits to do it it's definitely the easiest and best looking way to keep the bike looking original

Check it out right here:

http://www.ebay.com/itm/80cc-Bike-B...Parts_Accessories&hash=item3f40f17156&vxp=mtr

 

[landuse]

Free flow header and exhaust. That her ratio is definitely a recipe for disaster, no matter what size engine you have

 

[supermanotorious]

that's pretty slick, thanks!

If you do convert it I would recommend using the kits to do it it's definitely the easiest and best looking way to keep the bike looking original

 

[zzirrgrizz]

Free flow header and exhaust. That her ratio is definitely a recipe for disaster, no matter what size engine you have

What is a solution you would reccomend for this given what I said in my 2nd post

 

[mckutzy]

Where abouts are you located, your profile needs to be filled in.
With the law, is it specifically stated to have HP or cc for this class of vehicle.

Most cases of a cc limitation, the block or cylinder is marked with a certain cc rating and the owner just gets the thing bored out to a higher capacity.

In the end, are they (police or governing authority) going to dyno or compression test(I think that's what is done to check cc, I forget) your engine.

 

[zzirrgrizz]

Where abouts are you located, your profile needs to be filled in.
With the law, is it specifically stated to have HP or cc for this class of vehicle.

Most cases of a cc limitation, the block or cylinder is marked with a certain cc rating and the owner just gets the thing bored out to a higher capacity.

In the end, are they (police or governing authority) going to dyno or compression test(I think that's what is done to check cc, I forget) your engine.

CO btw. And the laws say nothing above 50cc but snyway I just need to know what I could do to possibly get more HP out of this thing? I mean it's just a bike as well if I have to kind of push myself with my feet on the ground slightly to get started from a dead stop I am completely okay with that

 

[rmm727]

your 2hp briggs is above 50cc then

 

[mckutzy]

Bore it over and/or add another deck height block, who's the wiser. If name plate says 2hp then it must be.. right.
(not totally familiar with this procedure, but im assuming needing new con rod, piston(if bored), machined to accept height block, new valves, new push rods, "Maybe" new cam, new bearings(might need a new custom side plate), probably need custom reinforced welding on the block, longer headbolts, crank shaft, new head while your at it.....Thats what I can think off the top of my head, probably more due to more capacity of the combustion chamber)

If it were me, id make an intake to fit a clone carb and go with that style to mod(with the higher flow filter, also there will be no gov with this carb). The exhaust can use a gas pipe and fittings( or make one welded together) for a header easily.

The latter mods on a clone account for several hp depending on how extensive the components are. Those are the cheap ones already, mentioned.

Whats your budget?


Oh and a big one on safety....... How do you plan to stop with that bike?..........

 

[zzirrgrizz]

Bore it over and/or add another deck height block, who's the wiser. If name plate says 2hp then it must be.. right.
(not totally familiar with this procedure, but im assuming needing new con rod, piston(if bored), machined to accept height block, new valves, new push rods, "Maybe" new cam, new bearings(might need a new custom side plate), probably need custom reinforced welding on the block, longer headbolts, crank shaft, new head while your at it.....Thats what I can think off the top of my head, probably more due to more capacity of the combustion chamber)

If it were me, id make an intake to fit a clone carb and go with that style to mod(with the higher flow filter, also there will be no gov with this carb). The exhaust can use a gas pipe and fittings( or make one welded together) for a header easily.

The latter mods on a clone account for several hp depending on how extensive the components are. Those are the cheap ones already, mentioned.

Whats your budget?


Oh and a big one on safety....... How do you plan to stop with that bike?..........

My budget is relatively low lets just say that!! But I guess I would be willing to spend a little bit more cash on this.

And as for your question on how I am going to stop this bike I am installing hand brakes on it. Thanks for the helpful response btw!

 

[mckutzy]

Ummm I think you misunderstood, actually it was kinda a loaded question.
Those rims aren't really acceptable to disc brakes(I'm assuming that's what your going to use), as in there isn't any room to mount the hub for the disc itself let alone the disc attached to the wheel hub .
The rim brakes usually installed when it was a bicycle, aren't good at all to stop that bike when at any speed past what a human can produced by it.

 

[Badot]

The rim brakes usually installed when it was a bicycle, aren't good at all to stop that bike when at any speed past what a human can produced by it.

Depends on the materials used. Biggest issue I've seen is with those plastic rims that come on cheap 'bmx' bikes, they just don't absorb any heat and melt the pads. Reasonably thick aluminum rims with high temp pads should work just fine though.

 

[landuse]

No matter what you do to that engine, if you do not change the gear ratio you are still going to have problems. You are going to have to gear a lot lower. You can do this by getting a larger rear sprocket, smaller clutch sprocket, or by using a jackshaft

 

[zzirrgrizz]

Ummm I think you misunderstood, actually it was kinda a loaded question.
Those rims aren't really acceptable to disc brakes(I'm assuming that's what your going to use), as in there isn't any room to mount the hub for the disc itself let alone the disc attached to the wheel hub .
The rim brakes usually installed when it was a bicycle, aren't good at all to stop that bike when at any speed past what a human can produced by it.

I don't plan on using a disc brake? Maybe you misunderstood me but I plan on using one of those brakes that clamp the ram not a disc?

 

[jeeperjoel]

if you want to be legal, and the limit's 50cc 2 stroke is the best option, years ago me and some buddies used to mount weedwacker, and chainsaw engines to mtn bikes and scooters... have one scooter left... it's up in rafters of garage, i'll drag it down sometime today and show you what i mean....

 

[mental74]

You can get 2 stroke 49cc Chinese engines for next to nothing & there are aftermarket parts all over eBay for them. As stated above, that 2hp motor you have is above 50cc. I think that you're more than double the cc you're able to run, so you're going to have to get a new one to comply with the law.