What pipe is A G1990 pipe

Top end pipe. Here is a clip from one of the old kart catalogs. Does yours have a big can or small can?

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I believe its a small can we used to run this type on a reed valve and a rotary corsair and still have both engine hope this can work on a yamaha engine .Were can I find information about these pipes still have a few that I am going yo try this year on dirt track need the lenght of pipe between header an pipe for good preformance
 
fasteddie14 said:
I believe its a small can we used to run this type on a reed valve and a rotary corsair and still have both engine hope this can work on a yamaha engine .Were can I find information about these pipes still have a few that I am going yo try this year on dirt track need the lenght of pipe between header an pipe for good preformance
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I love this pipe on my Yamaha
 

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This is the pipe that I will run I have so many back from the day cant remember what they are problem have about six to choose from most dont have no # stamp on them>
 
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This started out as a Gem Star, I guess it came along later than that list. We weren't building pipes at the time but EC couldn't resist making this one better. He had me cut it open and shorten the center section. While it was open I worked all the welds and turns with a body hammer on a pipe fixture we had. That's why the bends look smoothed out. When I was done EC fuse welded it back together, no rod. Then took it to his tig and wrote my name on it. I wouldn't hesitate to run it today against anything out there. Lol
 
I also have about 6 to 8 pipes from back in the day 2 that looks like the one from your post 2 1990 gem 90 degree pipes 1 G4 all the others dont know but we used them all for reed valve ,rotary valve and piston port just dont know what to use or try
 
fasteddie14 said:
I also have about 6 to 8 pipes from back in the day 2 that looks like the one from your post 2 1990 gem 90 degree pipes 1 G4 all the others dont know but we used them all for reed valve ,rotary valve and piston port just dont know what to use or try
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Post pics of them so we can try to identify them.
 
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