Help me ID these Comer 100cc Rotary Valve motors

Steve O'Hara · Last edited by Steve O'Hara on Tue Nov 06, 2012 12:47 am, edited 1 time in total

Guys,
Can anyone help me ID these Comer 100cc rotary valve air cooled motors? The newer motor is 50.02 and the older model is 50.06. The newer motor has the Motoplat and the older engine has the PVL ignition. Carbs look almost identical. The newer version has the purple cast to the head and the header mounting surface is tucked up in the fins like most engines of this type. The older model has the long exhaust with the header mount outside the fin area. Both have typical Formula A porting. I'm planning on selling these guys once I know what they are. Both appear to be in excellent condition but for a lot of typical dust and corrosion from sitting around. Been stored in sunny So Cal for a long time so they are still moist and oily inside. The older model has a little bit of rust on the tips base of the head studs.
They look nearly identical to the Rotax and Vortex Formula A motors I had back in the late 90s but these motors are 50mmx50mm bore stroke rather than the 50.8 bores I had with the Vortex
Model #s and manufacture date are what I'm most interested in learning. Anything else is welcome too.
Thanks,
Steve O'Hara
http://imageshack.us/a/img189/1281/dscn1270jd.jpg
http://imageshack.us/a/img100/8811/dscn1268m.jpg
http://imageshack.us/a/img835/9233/dscn1261q.jpg
http://imageshack.us/a/img405/9861/dscn1259j.jpg
http://imageshack.us/a/img831/5739/dscn1256v.jpg

Riley Will · Posted: Fri Nov 02, 2012 8:37 am Post subject:

What is the exhaust port layout? 4 port or 3 port?
_________________
Riley Will
BRC Engineering
rwill@brceng.com
(403) 216-0630 wk.
www.brceng.com

Steve O'Hara · Posted: Fri Nov 02, 2012 7:25 pm Post subject: Motor ID

Riley,
Three exhaust ports, one large center exhaust with the smaller added ports on each side... very typical FA motor of mid to late 90s.

Took the barrel off the newer motor to get a better look. The motor has what I would describe as a very standard configuration with the two side and one front transfer passage in the case matched to the passages in the cylinder. Typical rotary valve opening, coated single dykes ring piston, very heavy crank that makes me think it is a mid 90s vintage motor. The rod is billet but has no cutouts.
Everything inside looks new.. the motor appears to have very little time on it... possibly just break in running.
Here's a link to the photos I have taken so far. Most are of the newer motor. The pics of the piston that is completely black and the head that has a copper gasket are from the older version. I haven't had time to pull the barrel off the older engine yet.
In the photo of a bunch of pipes there is a Comer FA pipe right in the middle that goes with these motors... it's in good condition.
Hoping these pics will help someone recognize and advise on the model #s and year of manufacture.
Thanks,
Steve O'Hara
https://dl.dropbox.com/u/62354150/Comer%20FA%20Motors.zip

Riley Will · Posted: Sat Nov 03, 2012 7:04 pm Post subject:

Has to be homologation after the Rotax DSC. Rotax was the first with that exhaust layout. 1995 era I believe. Comer MIK350V I believe from the 1995 homologation.
_________________
Riley Will
BRC Engineering
rwill@brceng.com
(403) 216-0630 wk.
www.brceng.com

Steve O'Hara · Posted: Mon Nov 05, 2012 12:17 am Post subject: Thanks

Thanks Riley
Steve

Jim McMahon · Posted: Mon Nov 05, 2012 10:43 am Post subject:

To add to what Riley posted (maybe).... DSC was 92-94 if I recall rightly and had what I call the oval port exhaust design. I think you guys refer to it as something more technical though. I think the Italsistem MV1 ('92-'94) might have had the setup as well. Here are a couple homologation lists that might help..

https://www.dropbox.com/s/9wl5ryf9p550ua1/moteurs-1995.pdf
https://www.dropbox.com/s/c4tvvmu0y85flym/moteurs-1998.pdf

Comer don't have a rotary listed for '95-'97 so maybe its from '98-'01? I do recall some strong Comers in FA around that time. The motoplat ignition doesnt really fit into these periods though :/
_________________
CES Grattan pre-entry is open. TaG, Shifter, KPV, KT100, Animal\LO206, enduro or superkart.
Click Here to enter Grattan online

Steve O'Hara · Posted: Mon Nov 05, 2012 10:25 pm Post subject:

Jim,

Thanks for the help. I was surprised to find a Motoplat on the engine too. The older motor has a PVL ignition like I had on my Vortex motors in the late 90s. The carbs on these motors are not as evolved as the Ibea and Baroni stuff I had in the late 90s either. I've been unable to find anything conclusive but from my general knowledge of the Vortex motors of the mid to late 90s I am guessing these things are early to mid 90s vintage.
I have listed the newer motor on ebay with the DD34 pipe.
If any one is interested here's the item #.. 140881027676
Sure is a nice motor... I would keep it if I had a chassis to mount it on!
Steve O'Hara