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Post by templeton on Jun 13, 2016 20:57:53 GMT -5
Motorcycle week isn't all that great, but it is a great excuse to get out for a nice ride!
I'll keep that in mind Jess, I appreciate the heads up! I actually have been riding the bike with a small fire extinguisher in my backpack..I may continue to do so!
Now that I can actually put some throttle to the bike I've noticed that under load in 4th and 5th gear (3rd gear as well with my girlfriend on the back), starting about 4k rpm the bike goes into this very harsh vibration. any ideas on the cause of this one?
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ski
1st Gear
"If it ain't broke, you're not trying."
Posts: 53 
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Post by ski on Jun 13, 2016 23:21:29 GMT -5
I had a couple bikes do that as well. Make sure the chain is adjusted correctly and that it doesn't have too much side to side deflection. If it's an old chain, especially non-Oring, they don't hold up well.
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Post by wayne on Jun 14, 2016 0:03:12 GMT -5
Now that I can actually put some throttle to the bike I've noticed that under load in 4th and 5th gear (3rd gear as well with my girlfriend on the back), starting about 4k rpm the bike goes into this very harsh vibration. any ideas on the cause of this one? Welcome to the RE5. This is called "character" and it's just what they do. You'll find the journos back in the day commented on it when riding near new factory prepped bikes. It's a harmonic associated with the dynamics of the rotary engine and is transmitted through the primary chain and, unfortunately, through the bike. I'm told by a Mazda race shop that their engines actually have it too but it's masked by the twin rotors and engine mounting. There has been some success reducing it by using stronger tensioning on the primary chain but the bottom line is that you will not get rid of it. I believe from the various bikes I've ridden that it gets slightly worse with age and that makes sense as everything gets a little "looser". Watch this video showing 5 RE5's on a Dyno run, you'll see the vibration rpm band having an effect all the way into the operating final drive chain. The specific sequence is show at 1:17 but you'll probably enjoy the whole thing, it's only 2 minutes. |
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Post by templeton on Jun 14, 2016 8:04:02 GMT -5
Ski the bike has brand new sprockets and o-ring chain.
Wayne that is some crazy oscillation! I'll try tightening the chain up a little bit more.
Has noone tried to come up with an extra guide or damper to prevent this? I cant imagine leaving the bike to act like this
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Post by templeton on Jun 15, 2016 18:36:30 GMT -5
Another 100 miles or so still going strong!
I tightened the chain up a little beyond where I normally would and that seemed to cut down on the vibration a bit. Still there, but much less violent
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