Need a good Mac 91B1 head. As an alternative, has anyone had much luck Heli-coiling the plug holes on these? This one had a Heli-coil ...   Thu Jun 21st, 2018 01:16 am

Just passing the word along that Championship Enduro Series is allowing vintage laydowns to run with their enduro class karts. I recently ran Gateway with ...   Mon May 28th, 2018 11:44 pm

Were/are these used only on long tracks? I recently spent several years running 250 2 stroke micros, and we were pretty much into getting the ...   Wed Mar 28th, 2018 09:21 pm

Sounds like I'm headed in the right direction. Thanks a bunch! ...   Mon Mar 26th, 2018 01:34 am

I'd been looking at that one also. The kart is a Hornet LP2 I was told with typical right sidewinder configuration. The headers I have ...   Mon Mar 26th, 2018 01:06 am

.035 was what I was remembering. but then second guessing myself. I currently have a GEM box muffler on it, but have a 90 deg. ...   Mon Mar 26th, 2018 12:14 am

Just grabbed 7 of the AE901 plugs on e-bay. What do I gap them at? ...   Sun Mar 25th, 2018 11:08 pm

Thanks for the help. It's exactly what I needed. I'm starting to get excited. ...   Sun Mar 25th, 2018 10:59 pm

Getting my old Hornet with a Mac 91B1 on alky ready for a test run. Need to know what spark plugs to run. Can I ...   Sun Mar 25th, 2018 03:22 am

When and where is the first vintage enduro event in the Midwest? I'm about to get this old Hornet with a Mac ready and I'm ...   Sat Feb 24th, 2018 04:05 pm

Good to here from you. When I got back into this I figured parts would be hard to come by, but I'm finding out different. ...   Sun Feb 18th, 2018 08:27 pm

Just talked with him and got my parts coming. Thanks for the help. ...   Wed Feb 14th, 2018 01:30 am

How can I contact Terry Ives? The info I have evidently isn't current. Thanks for all the help. ...   Sun Feb 11th, 2018 04:05 pm

Putting together a Mac 91B1.I'm new to this and need to know where to get parts. Currently needing crank seals and ignition parts. Where do ...   Sun Feb 11th, 2018 02:45 am

Something similar to that is all I was coming up with. It sounds like a pain, but it at least validates what I was thinking. ...   Sat Jan 6th, 2018 02:48 pm

I am getting a mid 70s Hornet enduro and am working on the front drum brakes. How in the world do you bleed these. I ...   Fri Jan 5th, 2018 02:11 am

I am putting an early 70s Hornet endure together with a Mac 91B1 and am wandering where I'm going to be able to race it ...   Wed Dec 6th, 2017 12:00 am

Wow! Thanks for all the quick help. Will keep you posted on results. This is the first time I've been inside a Mac in 47 ...   Mon Nov 27th, 2017 09:59 pm

New guy here. Freshening up a Mac 91B1 for our Hornet enduro. Need to know what rattle can paint will come close to Mac yellow ...   Mon Nov 27th, 2017 01:32 am