Laura M-56 Kitting

So i really want to kit my batavus regency. There are no kits available for this bike however. Hear me out though. I've been looking at the puch engine and puch kits. It looks like the ports from the case to the cylinder are similar to each other. With some boring out i might be able to make them fit together?

Puch exploded view:

http://www.mopedsonline.com/m-o-l/trouble_shooting/maxi.htm

Batavus exploded view:

http://www.themopedjunkyard.com/tracenginemanual.jpg

Would this even be possible? I'm realizing i would have to cover the intake because the batavus's intake goes directly into the crankcase. Would this still work? Anyone have any opinions?

Laura M-56 Kitting

i think the stroke is different, the puch i think is longer, so, if you have access to machine tools, you could shave the cylinder. however this will affect the port timing.which is another mess.

Another better option might be pressing a puch stroke length con-rod with the same size lower end bearing as the m56 on an m56 crank and using a puch kit.

An issue could be the stud spacing. I have no idea if they're the same, they might be, they might not be.

bottom line: i don't think you can do this without some serious machine work.

or

you could just not potentially waste money on a kit/machining and tune the m56 the old fashioned way?

Laura M-56 Kitting

Edit:

The crank offset would need to be considered with the con-rod conversion as the crank offsets may be different between the puch and m56

Re: Laura M-56 Kitting

I hate to burst your bubble unreleasedenergy, but changing the conrod won't affect your stroke. If the conrod is 1 inch long or 100 feet long, the stroke per revolution will be the same. If you had a machine shop, you could make an entire new crank for the m56 that had the stroke of a puch and then adapt the jug to the block, but why? If your gonna go that far, do something like this:

<a href="http://s26.photobucket.com/albums/c129/71_Cheyenne/?action=view&current=Puchtavus001.jpg"; target="_blank"><img src="http://i26.photobucket.com/albums/c129/71_Cheyenne/Puchtavus001.jpg"; border="0" alt="Photobucket"></a>

Re: Laura M-56 Kitting

yah,

I realised that right after i hit post, hence the edit.

the con-rod would have to be the correct length though for a puch crank offset though, right?

good luck getting that to fit on the m56

Re: Laura M-56 Kitting

it might. depending on how far back the crank is set in the block.

Re: Laura M-56 Kitting

hmm,

i don't know what the difference is with the case dimensions

there are alot of factors to consider,

btw, what were you doing to that bat with those monster bolt cutters?

Re: Laura M-56 Kitting

castrating it. saves weight. and as a makeshift kickstand till I can get a motorcycle side stand molded on.

Re: Laura M-56 Kitting

man... i really wanted a nice easy way to get this bat goin faster. looks like its gonna be a lot of work, or no work at all ( aka no kit :()

Re: Laura M-56 Kitting

ok, so if i didn't get a kit, how much more performance could i expect if i got an expansion chamber exhaust? i know the exhaust ports wouldnt match, but what about chopping off the stock exhaust half way and using that for the first part of a 2 piece biturbo and just welding those together? would that be worth it? would it even work? i just can't stand "scootering" my bike up those big hills anymore :(

Re: Laura M-56 Kitting

even if you did kit it, you'd be ripping through those ultra-rare belts one a week...

Re: Laura M-56 Kitting

you know, the m56 engine has a few things going for it:

reed valve

belt drive

port timing

designed by scientists

. . . so why fuck with a good thing? you can get them to go 40, easy, with good acceleration, just by tuning the carb properly and replacing the belt and cleaning the exhaust. so just enjoy that, no? if you want to go faster than that . . . get a puch, or a moby. no?

Re: Laura M-56 Kitting

i had an M56 regency and it went up the biggest hills with no problem

yeah those belts are so hard to find i wouldnt bother id just leave it the way it is

if you had the m48 you can use the puch kits

Re: Laura M-56 Kitting

🇮🇹💦 Of the Loin /

m48 you can tweak the clutch and port the fuck out of the exhaust

Re: Laura M-56 Kitting

i can only speak for the m48 but, you might want to try a peugeot top end and add a 4mm base plate. It was the closest i came to fitting a different top end on my laura m48 before i sold the whole thing. might work for for the m56. the peugeot bore and stroke are the same as the m48 but the peugeot crank rests deeper in the case than the m48. The only modification is trimming the cylinder skirt a hair and widening the cylinder rod holes on the peugeot and it should fit. If you can get the stock peugeot test top end to fit and run smoothly then by theory you should be able to apply the same principle to a peugeot performance kit.

Re: Laura M-56 Kitting

Replace the belt with bike sprockets an a chain. You could bore your existing cyl and find a piston that might work. Watch height of crown above wrist pin

Re: Laura M-56 Kitting

Ok now I am interested in the bike sprockets and chain idea. Care to elaborate?

Re: Laura M-56 Kitting

yeah i'm interested in the sprockets too... i just noticed a small tear in one side of the belt... its gonna go pretty soon :(

Re: Laura M-56 Kitting

I have one of these engines but have never done the sprocket switch. I know the Euro boys have done it. The sprockets can be selected to raise or lower gearing. If you could attache a toothed pulley like you have now but with one less tooth then the commonly available belts would fit w/o being too tight. Sorry thats the best I know. The modern belts are far superior to the originals just one toothe too small

Re: Laura M-56 Kitting

On a side note. Has anyone found a different carb that will work on the m56 the tiny carb and teeny weeny reed block just doesn't seem right to me.

Re: Laura M-56 Kitting

someone on the west coast has one with a crazy intake manifold

Re: Laura M-56 Kitting

🇮🇹💦 Of the Loin /

vespa carbs. i just slapped a 12/12 on.

oih wait. i did this on m48

Re: Laura M-56 Kitting

Hey markryan, have any idea what the stroke is of the peugeot? i'm assuming that bore doesn't really matter all that much when kitting because i'd be putting a larger bored kit on it anyways... and anyone know what the stroke is of the m56 for that matter. i found the specs on the 48 which is a stroke of 38mm, but can't find any information on the 56... these things just seem to be shrouded in mystery and a bitch to work with... oh well... gives me something to do anyways... i mean who wants to ride mopeds anyways :(

Re: Laura M-56 Kitting

Peugeot Stroke is 39mm, m56 and m48 is 38mm

Peugeot sketch

i thought they were the same. i have to check my original drawings but i think i remember messing with the port timing by filing channels into the piston to allow for correct timing. the peugeot is the only way to go with laura kits- i spent a long time on this one before giving up, losing interest.

I did a super quick and shitty drawing from memory on mspaint. if anyone wants to fit a peugeot cylinder on a laura this will fit. whether or not it fires up is not tested.

(in the drawing i forgot that you have to cut the skirt a few mm. but not much.

1209781192_shittysketch.jpg

Re: Peugeot sketch

i've posted the shit out of this and nobody has ever picked up where i left off- it makes me want to fuck around with it to put this to bed.

Re: Peugeot sketch

lets hope you can put it to bed in a good way... bout to pick up a stock peugeot head and fuck with this myself...

Re: Peugeot sketch

by all means, please do.

Re: Peugeot sketch

shit... whats the stud spacing on your 48? i'm getting 1.75 inches from top to bottom... and 1.75 inches left to right on my 56... i posted another thread asking what the stud spacing on a peugeot was and he said 2x1.75... i'm wondering if the 48 and 56 have different stud spacing?

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