You should upgrade or use an alternative browser. Reed cages and spacers - why? Thread starter michael Start date Sep 24, Location Houston, TX. OK, so I know the purpose of reeds What I can not figure out is what the reed cages are rather why you would want replace stockers , and why the need for a spacer Boris The Good Old Days. Location The surf-less coast.
Cages hold the reed petals and spacers move the reeds away from the cases. In some setups the reeds partially interfere or block the intake ports VF3's in a GPR and need to be spaced out.
Keeping them out of the air flow also made them last longer. I run modified Kawi Cages in my Yamaha's because they are slightly larger than the stock Yamaha cages. The purpose of the reed spacer is to increase case volume and increase the turn radius into the transfer ports. Awk08 , Oct 14, Awk08 , Oct 15, You must log in or sign up to reply here.
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Yes, my password is: Forgot your password? Large displacement bikes tend to have high ratios because of inherent geometry, just the normal sizing of the cylinder, crankcase, and crankshaft flyweight diameters. Small bore engines are challenged to get the crankcase compression ratio high enough for quick throttle response.
If you look into the early karts of the s, there were all sorts of aftermarket accessories that took up volume in the crankcase including piston stuffers that were plastic inserts fastened to the cases and fitted to the underside of the piston.
They had ellaborate porting to channel the gasses being squeezed out from the underside of the piston towards the transfer ports. They called them turbo-squeezers, piston superchargers, and high speed gas funnelizers.
All funny stuff! I'm surprised that no modern aftermarket company has copied and recreated that old stuff from karting. In Mercury produced a snowmobile called the Snow-Twister that featured a shielded crankcase with a knife shaped connecting rod that protruded from a narrow slot in the crankcase. The case was fitted tight to the flyweights to reduce windage and volume in the crankcase. KTM copied that shielded case design for the late model and now shifter kart tuners are fitting aluminum tubing to the cases of CR and CR80 engines.
I guess all I can say about reed spacers is that they may or may not work for your bike and riding situation. My friend Jim always puts them on his s that I build him every year.
He swears by them and I swear at them. But as long as he thinks they work and it makes him ride better, who am I to argue. Two-stroke tuning is subjective and the world of unsteady gas dynamics is a turbulent one :eek:.
Last edited: Aug 10, Originally posted by EricGorr the world of unsteady gas dynamics is a turbulent one :eek:. Good info, eric. TR I used to work in a Husky shop where and when bikes came out sometimes we needed to find a quick or easy way to fix problems on them. We also raised the cyls by using thick base gaskets and did different things to make them start easier.
I dont really subscribe to some of the new go fast mumbo jumbo that is out there like turbo veincrank mods and junk. Display as a link instead. Clear editor. Upload or insert images from URL. Existing user? Facebook Twitter. Share More sharing options Followers 0. Reply to this topic Start new topic. Recommended Posts. Posted May 15, Link to comment Share on other sites More sharing options
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