100cc Tech Inspection

[Ron]

Hi Guy's,
If I put a 100cc top-end on my 72/73 Six Days and showed up with a 125cc Six Day decal on my green gas tank, what kind of trouble should I expect? I do have a 100cc side cover I could use.
I was planning to build a 1972 100cc Sachs to race, but with the new 6-speed rule change, I'd be ready to go pretty quickly (no pun intended).
Finishing 2 moto's might be my biggest challenge.
Thanks, RonW

[brian kirby]

Well, you wont know until you try, but this is a gray area in my opinion. The rule prohibits any parts from or for a 125, but since the CMF Penton 100 is identical to the 125 other than fiberglass color, the cylinder and the label on the engine cover I dont know how anybody but you would really know. How would they know it wasnt always a Berkshire you happen to have green bodywork on?

Another point that folks are missing is, they DO NOT check that your bike is legal for the class you are going to enter at Tech. They only check rear suspension travel and basic safety items, and sometimes they dont even do all of that as Larry Perkins has noted. The Tech inspectors WILL NOT look at your bike for legality of some specific item or part until one of your competitors protests you.

In the strictest reading of the rule, 125 fiberglass is illegal since it was originally not for the 100 even though other than color its identical. I think you would have to be obviously cheating with something that gave you a performance advantage before you would get a protest, but you never know.

Brian

'72 Six Day (on loan from Ernie P.)

[firstturn]

Ron,
  I am not familiar with how ARHMA operates other than what Brian just stated.  I know I wouldn't worry about showing up with fiberglass or stickers that do not indicate that my bike is anything, but a 100.  Of course the easiest way to prevent this is to just take the 125 part of the sticker and that would be that since anyone can paint a cover or tank any color they want.  Also, replacement covers are white does that mean it is a Mint 400.  
  As far as making sure the engine is a legal 100 it is just 4 head bolts and one can measure the bore and stroke.  I hope the above is a fair statement since I do not build bikes for this organization.

Ron Carbaugh

[brian kirby]

Ron C. is right. As long as your bike truly is a 100cc that is what is really important. It would take a really petty person to protest you on bodywork, so I say slap that 100cc top end on your bike and go for it.

Brian

'72 Six Day (on loan from Ernie P.)

[jj]

From my interpretation of the posts on the Yahoo Hodaka group, they have agreed that placing a 100cc motor in 125 model 97 Super Combat is allowed. This was based on the fact that the 125 model 97 Super Combat is basically the same as the 100 model 98 Super Rat except for the top end. With this known we would all have to agree that the same exchange is allowed on a Penton.

John J Slivka

[john durrill]

It might be a good idea to take a spare head gasket and torque wrench with you folks.
 It's cheap insurance in case you do have to remove the head.
 That will make it a quick and painless thing to do.
John D.

[brian kirby]

Anyone that protests a bike must file the protest in writing and for an internal engine two stroke protest, give a $100 protest fee. If the protest is upheld the person gets his/her $100 back, if the protest is denied the tech inspector disperses the fee at his/her discretion. I would assume (not always a good idea) that the person that got protested and won would receive some of the protest funds to offset gasket/parts costs.

But, I think Ron C. and John are right, its only 4 head bolts and a head gasket to measure bore and stroke so it would be smart to have a spare just in case.

Brian

'72 Six Day (on loan from Ernie P.)

[Ron]

Hi Guy's,
Thanks for all the input.
I won't be able to make Arizona, but I'm hoping to make Barona, CA FEB 16. I'll be sure to let everyone know what happens.
I'm to proud of my paint job to repaint it. I'll put some masking tape over the 125cc part.
Fortunately I have Circle F pipe that comes off pretty easy if somebody protest, the stock Penton pipe is a bear to remove.
Why would anyone protest a sweep rider anyway? LOL You desert guys know what I'm talking about.
Thanks again, RonW

[Paul Danik]

I don't wrench on those bikes as much as I used to, but wouldn't the head come off without taking off the pipe?

Paul

[Larry Perkins]

Paul,

It HAS been too long.  I don't think much of anything can be done with the stock pipe on.  It takes an act of congress, rotating the carb, and most of the time, removing the right shock to get the pipe off.  Now with the down pipe you are right.

Larry P

[Paul Danik]

Getting the stock pipe off of a Sachs powered Penton is not that bad in my opinion.

Remove ALL of the rubber pipe mounts from the pipe AND frame. Once you have worked the pipe past the exhaust flange on the cylinder, you will need to rotate the pipe almost 180 degrees and slowly work the pipe forward as you continue to do a bit of rotating as needed to get the pipe out past the airbox.

I remember one time at the sixdays, in a matter of minutes while hiding behind an old chicken coup, we had the pipe, cylinder and head off, oops, maybe I shouldn't tell that story...[8D]

Hope this helps,
Paul

[Dennis Jones]

Mine is going to be Jackpiner Blue [^]

You can see it at the bottom left of page 6 of the 2007 6th annual meeting at the AMA museum. From the Home page look in the photo gallery.

Dennis Jones

[Larry Perkins]

Go ahead and tell it Paul.  It would be interesting and the Statute of Limitations is up by now.

Larry P

[Ron]

Paul,
I've fought it a couple times and had to loosen the pipe so I could get to the head bolts, then remove the head to get the pipe off.
I questioned this on the board awhile back and I believe someone suggested I may be trying to use a 72 pipe on a 73 bike?
I'm not a Penton purist, I built it to ride, so I'll keep the Circle F pipe on it and keep what's left of my hair a little longer.
RonW

[Paul Danik]

Ron,

  The main thing is that you will be out their riding and enjoying your Penton Sportcycle, my hat is off to all of you guys who ride and race you bikes just for the shear joy of it. I hope than many more follow your lead and help to fill the starting line of this exciting class at each event.  

Good luck,
Paul