Puch Magnum MK2 jet sizes and more...

I'm pretty sure that my main jet and jet needle came in one piece in this new carb I bought from themopedjunkyard.com, even though it's listed as two different parts. Also, I'm pretty sure the jet size is 82... yikes. This could be a _very_ good reason as to why the 'ped would bog down and die at full throttle but ride decently at 1/2 or less, right? So, I guess I was wondering what the proper size of a jet should be for my bike? ('79 Puch Magnum MK2, I think it's 2 or 2.5hp) Also, do I need a new jet needle, since according to the explosion on themopedjunkyard's website, they're two pieces?

And my other question is pertaining to the horn. For some reason, it never stops. Is there a way to bypass it? Perhaps by soldering the blue and brown wires together?



Re: Puch Magnum MK2 jet sizes and more...

Hey Mike

I was out your way yesterday.. I took a fide from Boston to Vermont and back and saw signs for winchedon..

I have a 1980 Magnum MK2 also.. it's a 2hp. I also bought a new 15mm Bing carb and they ship those with #82 jets ( I suppose for all the people who install kits... no idea) When Puch sold those Magnums new they supplied two jets.. a #60 for the break-in period and a #58 in a little envelope to install after the break-in. either size will work fine.

Dont forget to clean the round air cleaner element with solvent (it pops out when you open the A/f) and spray a little oil on it afterwards for maximmum air flow..

The stock manifold on that ped is 12mm which is a bit restrictive.. I suggest you get a 14mm manifold (the tall one) to open up the flow of fuel and air a bit because I have a 15mm Bing replacement too and it just seems to run better and smoother with a closer match on the mm size.

The replacements are identical except for the nipple that injects the oil into the engine so if you are going to keep your oil pump setup original you will have to drill it out and tap in the nipple from the old one... I'm planning on doing this at some point but I disconnected my oil pump and I pre-mix because of the pumps age and I didn't trust it...so it's not an issue now.. I've since gotten a brand new replacement pump so I'm planning to re-install it at some point in the future (and use a little oil in the gas for good measure) but I'm having way too much fun on the thing to stop riding it long enough lol

Good luck... and lets rally!


Re: Puch Magnum MK2 jet sizes and more...

and the horn.. Just last week I helped a friend out who had the same problem... he has the same switches... the ped was left out in the rain last year and the contacts in the switch caused the horn to stay on... what a pain lol.. so he disconnected the horn.. and forgot he had disconnected it.. soooo when he brought it out for its Spring tune-up.. and it wouldnt fire up he thought it was some major problem and bought a bunch of parts.. carb, coil... etc.

I spotted the disconnected horn wires and crossed my fingers when we re-connected the horn wires... and the ped fired right up.. you should have seen the smile on my friends face... most excellent lol

I sprayed a ton of WD40 into the switch and just kept pushing the switch till it worked its way into the contacts.. after a while the switch found its groove and started working properly again... so my guess is that its the switch!

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