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Post by pete130 on May 3, 2018 17:12:17 GMT -5
Ive fitted new boysen power 2 stage reeds used a bigger reed body and stupid me didnt use reed stoppers it did have a single reed each side not 2 or 3 fingered ive now relised i could or will get flutter ive read.my question is ive seen a lot of reeds with out most are the single reed but are carbon fiber is that because they are stiffer and dont need a stopper would rather refit with stoppers if need now befor even starting new build i have a feeling i will be told never not fit stopper got confused with to manny to pick from lol i cant show pic as installed
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Post by 190mech on May 4, 2018 4:12:26 GMT -5
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Post by ThaiGyro on May 4, 2018 5:45:22 GMT -5
It is an interesting question. First in my questioning mind is the notion that they are called "stoppers' these days. As my history goes back to a gleam in your mom's eye or beyond...
The part you refer to pete130, is actually a reed diaphragm radius plate, which, by definition means that it is designed to control the arc of the diaphragm as it opens.
The only issues I see, if not using it are this: First, the opening is controlled by vacuum, but at the reed, is not a linear measurement...more vacuum induced flex at the outer, (weaker) edges and lesser pull at the connected ends. (stressed end) To me that means OK control on opening and not so on closing...further, the weak point becomes the guide edge near the mounting point. Much quicker to fail than a "guided" reed valve.
I have seen 2 stroke diesels with this arrangement, but the reed was designed to pivot and not to flex.
Bottom line in my history...it's OK for an emergency, assuming tuning can be done....but avoid it by using a radius limiter.
Just so you know...we did reshape them on older Yamaha TZ's to be a bit flatter, as we found the need.
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derek420
Scoot Member
Ready to Ride!
Posts: 33
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Post by derek420 on May 5, 2018 12:52:31 GMT -5
Boyeson Reeds usually come with a type of stopper its just a flat piece with 2 screw holes not like the OEM reed stoppers with the 2 or so metal stops you must use the stopper supplied or they will snap off at the screw as it don't put even pressure you do not want that take it apart Asap and put the one supplied in if the reed snaps it will go into the piston and a screw could fall out and sieze you bigger than hell. Boyeson are the only ones Ive seen that don't use the metal fingered stoppers like my bike has I bent mine out a little to let them open up more and they don't flutter but mine are metal, Reed flutter can happen by using a stopper or not its caused from using too thin of reeds for your engine and when this happens you must buy stiffer reeds.
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Post by pete130 on May 6, 2018 18:55:14 GMT -5
Thanks to all for advice the reeds only came with the small thin bar at bottom or reed and ive never fitted and stoppers(sorry thats what i call them lol) on my old dirt bikes and never had a reed break and that was on a worked YZ490K i would have thought it you needed the full length stopper they would have come with i did cut to suit reed cage better and still flatter dont realy want to take out i have a good seal there are thick at bace having 2 layers of reeds thanks again  |
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Post by pete130 on May 6, 2018 22:59:45 GMT -5
Thanks to all for advice the reeds only came with the small thin bar at bottom or reed and ive never fitted and stoppers(sorry thats what i call them lol) on my old dirt bikes and never had a reed break and that was on a worked YZ490K i would have thought it you needed the full length stopper they would have come with i did cut to suit reed cage better and still flatter dont realy want to take out i have a good seal there are thick at bace having 2 layers of reeds thanks again Thinking im ok i should have explained my self better i did install what came in package so im thinking im fine i started to think i needed the long ones that the reed sits flat against when fully open and thought they were right but when i dought myself i will always ask befor making more work than i need thanks again |
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