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Author Topic: ARD mag, first version and drag bike questions.  (Read 1851 times)

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Offline Don R

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ARD mag, first version and drag bike questions.
« on: October 16, 2013, 09:19:51 PM »
 I bought an old drag bike with an ARD, from what I learned here it is a first version. It has sat for years and the engine isn't currently running. Does anyone have tips for preserving the timing marks before removal or tips on how to test it. I was thinking of removing the timing belt and spinning the mag with a battery drill. The crank end bolt was loose. I applied some kroil into theinternal threads hoping to loosen the crank pulley. I'm guessing it has a bearing and a keyed crank adapter in the original points area.
« Last Edit: October 18, 2013, 10:14:46 PM by Don R »
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Offline 754

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Re: ARD mag, first version ?
« Reply #1 on: October 16, 2013, 09:39:30 PM »
Should be pinned to the advance hole in crank.  I thing mag gets rotated in housing, then locked to set timing
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Offline BPellerine

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Re: ARD mag, first version ?
« Reply #2 on: October 17, 2013, 02:25:35 PM »
you set the timing at the crank .with the crank pulley fixed in place you rotate them both while holding the rotor at no1 with no1 piston at tdc .if the mag has been on and off the marks don't mean much unless you can check somehow.search for mag timing sohc boy.he made a small deg wheel to go on his with a pointer.he had his set at about 30 degrees advance so less kickback.bill
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Offline Don R

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Re: ARD mag, first version ?
« Reply #3 on: October 17, 2013, 10:14:42 PM »
The entire unit is still bolted on as when it was raced. I didn't want to remove it and cause a bunch of work until I understand it. Thanks.

I'm assuming kickback is why the kick starter is bent and broken. My thought was to remove some timing also. This is just a restoration for shows and cacklefest duty, I don't plan on racing it. well maybe once. LOL.
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Offline Don R

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Re: ARD mag, first version ?
« Reply #4 on: October 18, 2013, 07:27:18 AM »
Assuming this engine is a 915 or slightly bigger, (the son remembered boring the cylinder and welding the inside of the fins where it cut through)  If I turn back the timing and fix the kickstarter can it be kickstarted or should I just remove it and put on a remote unit?  Don't want to split the cases if it won't kick start anyway.
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Offline gschuld

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Re: ARD mag, first version ?
« Reply #5 on: October 18, 2013, 02:44:16 PM »
I can't help but ask... would you mind posting a few pics of your vintage drag bike? 

George
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Offline Retro Rocket

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Re: ARD mag, first version ?
« Reply #6 on: October 18, 2013, 02:49:26 PM »
If its been welded up it will be bigger than 915.... ;)
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Offline BPellerine

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Re: ARD mag, first version ?
« Reply #7 on: October 18, 2013, 05:25:06 PM »
they say they can be kickstarted if the timing is at between 28 to 32 deg adv.according to the info from years gone by.they used to fit them to the rc cobra engines.and the mag I have came off a kick only 850.bill
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Offline Don R

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Re: ARD mag, first version ?
« Reply #8 on: October 18, 2013, 05:26:50 PM »
The stepson said it was a 1200. I didn't see a spacer under the cylinder or holes through the fins but didn't argue the point much. It sat in the back of a bike shop and was robbed of parts for years. I can't believe he didn't drain his own carbs.


The spots under the engine are water. It just came from the car wash. And yes I plugged the exh and int's.
« Last Edit: October 18, 2013, 05:35:35 PM by Don R »
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Offline Don R

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Re: ARD mag, first version ?
« Reply #9 on: October 18, 2013, 05:31:59 PM »
It has a Honda frame, they cut the two bars under the tank and the back peg loops off. It had a fiberglass tank and a mac header which are gone. Stock swingarm, struts the rear wheel came off the sandcast I bought the same day. I put it back on the sandy.
 It's got an engle cam, ti retainers and good springs. No nuts welded in the rocker cover. It's titled as a 73 but the front end, swingarm and wheels are earlier as are the cam towers. I didn't check the engine # yet. It appears to have all the gears but the kickstart is frozen and bent.
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Offline Don R

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Re: ARD mag, first version ?
« Reply #10 on: October 18, 2013, 05:33:36 PM »
Thanks Bill.
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Offline Don R

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Re: ARD mag, first version ?
« Reply #11 on: October 18, 2013, 05:39:55 PM »

Carbs are soaking,
I rebuilt the handlebar rack today, I was able to put on a Honda throttle with a working kill button, a clutch lever and adjuster, polish the bars, oil press guage and bracket and make a new safety lanyard with a set of 750 points and the original cord. I'm going back out to put the cable drive drag specialties tach back on now. The PO's family owes me a picture or I'm doing it my own way. They say they want to buy it back when it's done.
« Last Edit: October 18, 2013, 05:46:17 PM by Don R »
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Offline BPellerine

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Re: ARD mag, first version ?
« Reply #12 on: October 18, 2013, 06:17:54 PM »
yep early fm mag same as mine.cool old bike! bill
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Offline Don R

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Re: ARD mag, first version ?
« Reply #13 on: October 18, 2013, 10:13:56 PM »
 I'm pretty sure I'm going to need a time slip. Just one. The head work is gorgeous, Engle cam. Not really big. I'm still wondering if he ran these very stock looking carbs. 130 mains. They don't appear to be bored.
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Offline BPellerine

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Re: ARD mag, first version and drag bike questions.
« Reply #14 on: October 20, 2013, 03:59:23 PM »
I was reading an old mag today from 1974 and it had a pic of rc on his blown single engine bike.he was standing holding the bike steady while the boot of a much larger person was kicking the bike over it had an ard on it.hope that is not what it takes for your bike haha .bill
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