MOPED ARMY

Ok 504's are kinda not exaclty know for thier power in the first place, but they are cool motors and they are reliable as a brick stock.

the problem is , well..you have a b model which is the intentionally restricted 504 so its slow as shit.

they do this by using a exhuast that is restricive ( see how it bottlenecks once it leaves the engine?) , using a 10mm carb instead of the 12mm the A model uses, and actully just to make your day worse the porting in the exhuast port is different, (smaller ) and the clutch is a bit wimpier ( and they aint nothing to write home about in the first place.

Id look around for a 504 /a and get a decent stock pipe that isnt restricted and you will be a much happier camper with a 32mph bike.

get any thoughts of using a 505/d out of your mind , thats another discussion alltogether, it will not bolt up and it aint worth it anywho.

I actually have a 504/a with ultra low milage , email me if your interested.

If your looking for the ultimate in cheap, you could go for a decent unrestrictive header pipe and a delorto 14:12 and jam it on the manifold you have but you will always be fighting the internal inside the barrell resrictions of the b barell, and while not insurmountable, tis way harder with that damned sachs all one piece head...

do this:

bigger carb. 12mm will get you to 25 mph alone, a round bing will work if you want to grind the bottom nut off- then you can get a 15 bing and 15mm intake- but then you have to use a small strap wrench to open up the bowl. a sha intake is available but it's 40$. usually the slides and needles are different going from the 10 -12mm if you keep with the square bing

better exhaust header. i used a puch one that most people make the 24mm intakes out of- but that's just because i had it laying around. alot better torque, mines held on with springs. not quite the best seal.

sprockets. you probably have a 9-10 tooth front, get an 11, and on the rear take it from what is most liekly a 50 down to a 46 or so, and you'll get up to 30ish (with 12mm carb).

head gasket. not sure on this one, but have heard some restricted ones have a thicker or multiple head gaskets to lower compression. mine didn't.

crap yeah i meant base gasket- any truth to that?

I had the same slow ass Sachs as you Ryan. I swapped to a 508 case (ported like a 505 with the longer stroke and all but does not have the pedal shaft through the case), d cylinder, 12 mm square Bing, sorry can't remember the number, and a fat header. I regeared, but again can not remember the ratio, and now that bike will do about 35 or 36. It takes a second to get into it, but when it does it moves alright.

Jesus i hate disagreeing with people with little pictures next to thier names, especaially ones with the little creatures things, but dude, your wrong, Creature or not. A puch motor will NOT bolt up to a sachs frams.

Take my word for it, there is an e50 sitting right on my bench next to a sachs powered sparta frame. The sachs frames use 2 bolts to hold a heavily rubber mounted / dampened skinny ass cased 504 in the frame. An e50 is to Fat. WAY to fat. Needs all new motor mounts. So it is as easy to say a batavus motor fits in there or a tomos motor or a kawasaki kx100 motor. Any of those ways, and your welding in mounts and alighning the chain and stuff.

It wont bolt up.

Well, looks like there really is no cut and dry answer...just what I was afraid of. Finding a 504 /a or another ped altogether might be the best long-term options.

I might start out trying the 12mm bing and better exhaust header. Sprockets might also be an option. Thanks all for your suggestions. If anyone else has had luck with the slow 504/B I'd love to hear it.

if you re sproket it is gonna be SO damned slow off the line your gonna need one of those things they use to get planes off the deck of aircraft carriers man.

The b is so slow its miserable. The 12mm and the exhaust will help to some extent definatley.

@andrewhed

Thanks for the tip. I'll start there.

Handy bikes has exhausts on ebay. They mount on the right side i believe so if you have back pedal brakes you are sort of SOL

504 and 508 are almost the same. The porting and cylinder studs are different. A D cylinder would not mount to the old 504 I had unless I would have drilled and tapped new cylinder bolts and ported like crazy

I forget if it's the A or B that has one stud in the wrong spot.

@andrewhed: I might be interested in that square bing.

What would be a decent exhaust for a 504? It's on the left side of the bike, and I do have backpedal breaks...I'd prefer to not block the pedals if possible...

Ryan, if you have back pedal brakes, you have a 505

Hey, thats right lol!

All balboas are 505's

That makes things WAY easier in terms of making it get out of its own way.

you can find a 505/a which is better

the 505/c which is even better then that ( square boxy jug )

or , now that you know it will take a 505, a a 505/d would be awesome.

I had a balboa with a 505/c and it was pretty damn quick for a sachs ( way quicker then a 504 ) but it had the 12mm carb and a big exhuast header.

Weird....

I originally thought I had a 505 because the first 3 digits of the vin # were 505. Then, when I took the panels off to take a look at it, the engine clearly says Sachs 504/1BS. Also, the pedals don't go through the engine like they do in the 505. But I definitely can brake by backpedaling.

Yup, two chains and extra slowness.