Originally Posted by mdchris (Post 11236710)

Sure, I don't doubt that it does, but for the people reading this thread all they can see is you quoting somebody saying "4 port motors are better than 3 port motors" and then people losing their mind over it.

If there's a personal issue it should be handled in private. Airing it out in public just makes you all look bad.

Originally Posted by hambone (Post 11236802)

Nice! Thank you.

Originally Posted by kgombe (Post 11236849)

i really want to know what is novarossi coming with next year for 2013.. maybe some new glow plugs... shrugs shoulders

Originally Posted by afr0sch (Post 11236902)

Maybe new crankcases without the vacuum port hole under the carb so you don't have to plug it, or a smaller diameter hole at least?

Originally Posted by PERROTTO (Post 11231971)

Guys, this is just a discussion. I too want to get to the bottom of it. The problem is the variables that we can not always control or predict. I am hear to learn like many other and to offer good advice if I feel 100% confident in what I'm saying.
Soo, I have two buttons I am showing below. Freshly removed OS p3 plug from #1 and freshly removed a nova c6 plug from #2 here are some pics and measurements:
Glow plug measurements-width of tip
Nova c6~4.65mm
OS p3~4.80mm
Glow plug measurements-length of taper
Nova c6~2.00mm
OS p3~1.50mm

Button measurements-width of plug hole in combustion chamber
Button #1(OS p3)-4.79mm-started off with nova plugs then went to OS plugs.
Button #2(nova c6)-4.88mm-100% nova plugs from new

Both buttons were cleaned with Laquer thinner before photo.
Button #1
http://i1197.photobucket.com/albums/...ps79a46bb2.jpg

Button #2
http://i1197.photobucket.com/albums/...ps56a95aac.jpg

Both plugs
http://i1197.photobucket.com/albums/...psf793065e.jpg

Sorry if pics are bad, best I could do.

Originally Posted by 22Racer (Post 11239191)

I measured Nova vs. Os plugs around 5 years ago. The taper on the Nova is longer but as I remember the angle and bottom diameter were very close. (measuring with an optical comparator) What I concluded was that Os does not tap the head button as deep and they relieve the plugs to compensate. So if you try to put a Nova plug in a Os button it bottoms out on the threads before the taper seals. I actually relieved a Nova plug so it looked similar to the Os and it worked fine. Now I can see if someone is having trouble with Os plugs ruining a Nova button it may be because there is less surface area and if you overtighten the plug it opens up the hole slightly. I will measure some plugs next week and report my findings.

Rex

Originally Posted by 22Racer (Post 11239191)

I measured Nova vs. Os plugs around 5 years ago. The taper on the Nova is longer but as I remember the angle and bottom diameter were very close. (measuring with an optical comparator) What I concluded was that Os does not tap the head button as deep and they relieve the plugs to compensate. So if you try to put a Nova plug in a Os button it bottoms out on the threads before the taper seals. I actually relieved a Nova plug so it looked similar to the Os and it worked fine. Now I can see if someone is having trouble with Os plugs ruining a Nova button it may be because there is less surface area and if you overtighten the plug it opens up the hole slightly. I will measure some plugs next week and report my findings.

Rex

Originally Posted by BrakeTurnAccelerate (Post 11239675)

Hardly accurate, but....


http://imageshack.us/a/img534/4124/plugsn.jpg

Originally Posted by Maximo (Post 11240202)

thanks Rex...that is exactly what I thought....... Same taper angle, same thread pitch... same bottom diameter.... plug seats perfectly with no issues....;);););).....Issues only from over tightening ......... For those who don't know Rex is a tool and Die maker with access to the most precise measuring tools and techniques.........An Optical comparator is not a joke.......

Originally Posted by 22Racer (Post 11239191)

I measured Nova vs. Os plugs around 5 years ago. The taper on the Nova is longer but as I remember the angle and bottom diameter were very close. (measuring with an optical comparator) What I concluded was that Os does not tap the head button as deep and they relieve the plugs to compensate. So if you try to put a Nova plug in a Os button it bottoms out on the threads before the taper seals. I actually relieved a Nova plug so it looked similar to the Os and it worked fine. Now I can see if someone is having trouble with Os plugs ruining a Nova button it may be because there is less surface area and if you overtighten the plug it opens up the hole slightly. I will measure some plugs next week and report my findings.

Rex

Originally Posted by afr0sch (Post 11236902)

Maybe new crankcases without the vacuum port hole under the carb so you don't have to plug it, or a smaller diameter hole at least?

Originally Posted by kgombe (Post 11236911)

good point... although i never plugged mine.... not sure of what size they were through out the lives of Novas.. but that a good point..

Originally Posted by chopper82p (Post 11240474)

I don't think they will make it smaller or remove it from their crankcases. They want to sell as many 17011's/17012's as possible and if they find vacuum return ports make the bearing lifetime shorter, and make a leaky front bearing more obvious, they wouldn't remove it...I don't think