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Author Topic: Maico 620 SM  (Read 9524 times)

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Offline FrenRob

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Maico 620 SM
« on: December 02, 2011, 01:14:21 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 :)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline cnrcpla

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Maico 620 SM
« Reply #1 on: December 02, 2011, 06:28:00 AM »
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  :)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline FrenRob

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Maico 620 SM
« Reply #2 on: December 02, 2011, 07:55:06 AM »
Thanks for the reply, :) but when I say on the pipe I mean hooking into the powerband :o
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline factoryX

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Maico 620 SM
« Reply #3 on: December 02, 2011, 08:36:57 AM »
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.).
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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I ride an 03 yz250, wait 04, wait 05, what ever, they're all the same #$@% YOU!

Offline ford832

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Maico 620 SM
« Reply #4 on: December 02, 2011, 01:04:04 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.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Coop

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Maico 620 SM
« Reply #5 on: December 02, 2011, 01:47:46 PM »
Welcome to the site.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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- Mike - Don't take life so seriously, nobody gets out alive.

Offline cnrcpla

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Maico 620 SM
« Reply #6 on: December 02, 2011, 01:48:32 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.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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Maico 620 SM
« Reply #7 on: December 04, 2011, 11:19:38 AM »
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
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline cnrcpla

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Maico 620 SM
« Reply #8 on: December 04, 2011, 12:40:38 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.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline FrenRob

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Maico 620 SM
« Reply #9 on: December 05, 2011, 03:22:40 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
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline cnrcpla

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Maico 620 SM
« Reply #10 on: December 05, 2011, 11:59:07 AM »
Thats great  :D good luck with the rest, and have fun riding it  :)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline SachsGS

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Maico 620 SM
« Reply #11 on: December 10, 2011, 04:40:19 PM »
Plug reading and actual compression reading?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline cnrcpla

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Maico 620 SM
« Reply #12 on: December 13, 2011, 01:09:39 AM »
I guess he fixed it  :P
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline FrenRob

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Maico 620 SM
« Reply #13 on: December 17, 2011, 07:09:52 AM »
Nup... Blew my knee up instead ><img src=" title="Angry" class="smiley">
Tuesday or Wednesday will be the telling time  :-
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline cnrcpla

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Maico 620 SM
« Reply #14 on: December 17, 2011, 11:13:56 PM »
Ouch  :-X  Well good luck on Wednesday  :)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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