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Author Topic: Maico 620 SM  (Read 1722 times)

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Offline FrenRob

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Maico 620 SM
« on: December 02, 2011, 09:14:21 AM »
Hi all,
My name is Rob and I am new to your site. I have joined in the hope of finding more info on the above mentioned bike.
It is a 2010 Koestler built Maico 620 Super Motard and has been a bit of a lemon from day 1.
The main problem is that it " 4 strokes " when it is running and rarely comes on the "pipe".
Does anyone here have any idea what my problem may be ????
Thanks in advance.

Rob :)
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Offline cnrcpla

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Re: Maico 620 SM
« Reply #1 on: December 02, 2011, 02:28:00 PM »
When you say its not running the pipe, I am assuming that you mean lacking power? In any case I would try cleaning the carb and maybe consider checking your power valves. I'm not a big Maico professional, so that's all I got :-X   Best of luck to you  :)
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Mixin' gas and kickin' ass, Burnin' oil and smellin' royal. Two stroke until I die (which hopefully isn't soon)   If your not mixing gas, your not kicking ass.

Offline FrenRob

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Re: Maico 620 SM
« Reply #2 on: December 02, 2011, 03:55:06 PM »
Thanks for the reply, :) but when I say on the pipe I mean hooking into the powerband :o
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Offline WTFactoryX

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Re: Maico 620 SM
« Reply #3 on: December 02, 2011, 04:36:57 PM »
These pistons are huge, so basically its got a crap load of torque but not as revy as some of the smaller bikes. First thing I would do is a compression check and check jetting(plug chop etc.).
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Offline ford832

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Re: Maico 620 SM
« Reply #4 on: December 02, 2011, 09:04:04 PM »
The problem Rob is that none of the Maico types on here like to see the "best bike ever built" referred to as a lemon-even if it's true. :D
Welcome aboard.I'm sure some of the Maico guys will be along sometime.
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Offline Coop

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Re: Maico 620 SM
« Reply #5 on: December 02, 2011, 09:47:46 PM »
Welcome to the site.
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Offline cnrcpla

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Re: Maico 620 SM
« Reply #6 on: December 02, 2011, 09:48:32 PM »
If it isn't hitting power band by bogging down, then you may want to check the compression as factoryx had mentioned. Or maybe your main jet is clogged. If it has sit in storage, or just hasn't been cleaned in a while, then after a quick compression test, the carb may be a good place to check as well. I have never ridden a big bore Maico so I couldn't tell you how revy they should be for such a large engine.
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Mixin' gas and kickin' ass, Burnin' oil and smellin' royal. Two stroke until I die (which hopefully isn't soon)   If your not mixing gas, your not kicking ass.

Offline 2T Institute

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Re: Maico 620 SM
« Reply #7 on: December 04, 2011, 07:19:38 PM »
If the main jet was clogged it would have seized already. Power valve could be a good place to start then I would check the ignition timing, by that I mean strobed with a timing light v's marks made on the flywheel graduated from mm BTDC
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Offline cnrcpla

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Re: Maico 620 SM
« Reply #8 on: December 04, 2011, 08:40:38 PM »
You could check the timing, it wouldn't hurt. But the main jet has a series of small holes that go up the length of the jet, if the higher ones are clogged but the whole jet isn't completely, then that could also be your reason that the engine might not be getting enough fuel to hit power band.  At least I think the jet should have those holes, my bike doesn't, but like I said, I'm not a Maico pro by any means.
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Mixin' gas and kickin' ass, Burnin' oil and smellin' royal. Two stroke until I die (which hopefully isn't soon)   If your not mixing gas, your not kicking ass.

Offline FrenRob

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Re: Maico 620 SM
« Reply #9 on: December 05, 2011, 11:22:40 AM »
Hi guy's,
Thanks for the replies.
This engine does not have a powervalve so thats one thing I don't need to worry about. The carby has been meticously cleaned and appears OK. It has a brand new complete PVL ignition installed and this certainly improved things. i don't think compression is an issue either as it just wants to throw me over the bars when I kick it over :D I will be trying to fire it up over the next couple of days and I will see how I go and report back.

Cheers
Rob
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Offline cnrcpla

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Re: Maico 620 SM
« Reply #10 on: December 05, 2011, 07:59:07 PM »
Thats great  :D good luck with the rest, and have fun riding it  :)
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Mixin' gas and kickin' ass, Burnin' oil and smellin' royal. Two stroke until I die (which hopefully isn't soon)   If your not mixing gas, your not kicking ass.

Offline SachsGS

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Re: Maico 620 SM
« Reply #11 on: December 11, 2011, 12:40:19 AM »
Plug reading and actual compression reading?
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Offline cnrcpla

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Re: Maico 620 SM
« Reply #12 on: December 13, 2011, 09:09:39 AM »
I guess he fixed it  :P
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Mixin' gas and kickin' ass, Burnin' oil and smellin' royal. Two stroke until I die (which hopefully isn't soon)   If your not mixing gas, your not kicking ass.

Offline FrenRob

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Re: Maico 620 SM
« Reply #13 on: December 17, 2011, 03:09:52 PM »
Nup... Blew my knee up instead >:(
Tuesday or Wednesday will be the telling time  :-\
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Offline cnrcpla

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Re: Maico 620 SM
« Reply #14 on: December 18, 2011, 07:13:56 AM »
Ouch  :-X  Well good luck on Wednesday  :)
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Mixin' gas and kickin' ass, Burnin' oil and smellin' royal. Two stroke until I die (which hopefully isn't soon)   If your not mixing gas, your not kicking ass.
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