Newbie w/ 1981 G1 questions

steve1920 · 08-27-2010, 10:40 PM

Hello everyone. I found this site by accident yesterday and I'm glad I did!! What a great site. I spent two hours reading over the posts and this evening I BBQed my muffler. The new paint is drying and I'll try it tomorrow. I have a ton of questions but I'll keep it short tonight.

What is the butterfly in the exhaust port for? Is it a type of Jake brake? Is it really needed? Do muffler modifications help the performance? Or is it not a good idea to modify the exhaust because of the oiling system/backpresure hose? How many cc's is this engine? What is the best oil to use for the injection on this cart?

Thank's guys,
Steve

GMB74 · 08-28-2010, 05:19 AM

Welcome to BGW!
The butterfly is an exhaust restriction to make the engine run smoother and quieter at low RPM's. It keeps the fresh fuel charge from rushing out the exhaust port with the exhaust. Since most of us here tend to do more full-throttle type driving and less putt-putting from hole to hole on the golf course, it really is not needed. You can wire it wide open, or if it is worn/broken remove it entirely and weld the shaft holes shut. This is a low-output 215cc engine, and exhaust mods are most effective if you make other mods to pep up the engine's performance. There are some good threads on here about that. Search for posts by Tikicart and Sho305 among others. Brand of oil is personal preference, but here are some things to consider:
http://www.ultralighthomepage.com/OIL/oil.html

08-27-2010, 10:40 PM	#1
steve1920 Not Yet Wild Join Date: Aug 2010 Posts: 11	Newbie w/ 1981 G1 questions Hello everyone. I found this site by accident yesterday and I'm glad I did!! What a great site. I spent two hours reading over the posts and this evening I BBQed my muffler. The new paint is drying and I'll try it tomorrow. I have a ton of questions but I'll keep it short tonight. What is the butterfly in the exhaust port for? Is it a type of Jake brake? Is it really needed? Do muffler modifications help the performance? Or is it not a good idea to modify the exhaust because of the oiling system/backpresure hose? How many cc's is this engine? What is the best oil to use for the injection on this cart? Thank's guys, Steve
steve1920 Not Yet Wild Join Date: Aug 2010 Posts: 11

08-28-2010, 05:19 AM	#2
GMB74 Gone Wild Join Date: Jun 2009 Location: Heluvabump,VT Posts: 623	Re: Newbie w/ 1981 G1 questions Welcome to BGW! The butterfly is an exhaust restriction to make the engine run smoother and quieter at low RPM's. It keeps the fresh fuel charge from rushing out the exhaust port with the exhaust. Since most of us here tend to do more full-throttle type driving and less putt-putting from hole to hole on the golf course, it really is not needed. You can wire it wide open, or if it is worn/broken remove it entirely and weld the shaft holes shut. This is a low-output 215cc engine, and exhaust mods are most effective if you make other mods to pep up the engine's performance. There are some good threads on here about that. Search for posts by Tikicart and Sho305 among others. Brand of oil is personal preference, but here are some things to consider: http://www.ultralighthomepage.com/OIL/oil.html

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