Expansion chamber

biken stins

Member
Local time
11:03 PM
Joined
Jun 28, 2008
Messages
337
Location
Lakewood WA
Has anyone tried or know about the Sky Hawk expansion chamber ?
Saw them on Spooky Tooth in their engine section. The STC site lacks on details and size engine it is to be used on.
 
I just insalled an expansion chamber on my happy time.
Mine needed welding,

Nasty twisty bends,in relatively small pipe.
A lot of trial and error.
Plus
a jet modification.
Lower restriction air filter.
I would say at least a 30 percent improvement.

A bolt on expansion chamber sounds a lot easier.

I haven't port matched mine yet.
 
I got the Skyhawk pipe today from Spooky Tooth, super fast shipping, only three days! the pipe looks great and came with a nice gasket, I bolted it on and it fit perfect except when I pedaled, very bottom of the crank arm just barely ticked the pipe, I'll grind off an 1/8" from the end of the crank. anyway, I took it out for a spin WOW!!! It was noisy, pop...pop...pop.. like a tuned pipe should sound, I went for a 3 mile ride and decided it does definitly increase performance, the power band is in the higher rpms, But I cant handle the noise, actually I love the sound! but it drew alot of attention, (I live downtown Minneapolis) so I dont think this pipe is for me I want to be stealthy when I ride and stay out of trouble. :cry::cry:
 
Sounds good. Ordered Thur. Did ask Roland if you could put a silencer on it. It would have to be DIY. There are some on scooter sites but someone with more knowledge would have to point the direction. I like some of the one that others have made on this site.
Did you get the carb also ?
 
I do want the CNS carb, also next engine I buy I will have STC do all of the port work, polishing and milling, for $75 thats not bad at all.
 
That's strange, The pipe is no longer listed on the STC site, STINS and I must have ordered the only two they had? I will get some pics of it for you.
 
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