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Post by kanonkopdrinker on May 20, 2015 11:48:59 GMT -5
Anyone know of any dealers anywhere who might have a couple of primary chains (21190 37020) that they would be willing to ship to the UK?
Many thanks,
David
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Post by mike500 on May 20, 2015 12:13:45 GMT -5
about the only chance you will have is if you can find a good 2nd hand one,the part has been obsolete for years regards mike
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Post by timpa136 on May 20, 2015 12:25:47 GMT -5
I have one that will stretch out in a straight line open ended, I don't think you would want that one.
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Post by Jess on May 20, 2015 14:33:31 GMT -5
They have been obsolete for a long time. There was discussion about having reproductions made a few years ago...
I never heard any more about that as it is an expensive piece to make.
You may feel free to pm me and I will see if I can help.
Best,
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Post by goandy on May 21, 2015 4:06:45 GMT -5
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t140v
3rd Gear
Posts: 427
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Post by t140v on May 29, 2015 14:38:58 GMT -5
Anyone know of any dealers anywhere who might have a couple of primary chains (21190 37020) that they would be willing to ship to the UK? Many thanks, David Evening David, with the original suzuki duplex chain a no go is there enough room to fit two single row chains on the duplex sprockets, there is some very good quality chain out there thsese days and I am sure two strands of single would be at least as good if not better than the original duplex. Regards Stuart. |
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Post by Glenn RE5 on Jul 5, 2015 18:56:37 GMT -5
Am looking for a primary chain also and the more i read the more you start to think the vibration problem is in part caused by worn chains....My bike has only done 12000 miles and its knacked..... quote from a past forum......[I have two of these machines running and have noted similar vibrations.They
happen at about 3000 RPM under less than full throttle acceleration. I called
Sam (of Rotaryrecycle) he said it is likely to be a streached primary chain
or a clutch basket breaking at its weld points.Apparently this can happen if
an RE5 is ever wreaked,that part I dont understand yet. My 76 rumbles like a
cement mixer wereas my 75 just slightly. Im guessing that this is mostly
normal but can be aggravated by worn primary components. I will soon be
takeing my 76 all to bits to explore this problem....] Will look into having some made but am sure it will be expensive ....
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Post by wayne on Jul 5, 2015 22:12:43 GMT -5
For new members.......Just to repeat what's been said before regarding the primary chain. The grinding vibration is an engine harmonic that is transmitted through the primary drive and all the way to the final drive chain.
Remember that back in the day, factory prepared brand new test bikes had the rumble/grumble/grinding/vibration. Test riders commented on it. Presumably, the primary chains would have been perfectly in spec.
My own riding of local RE5's does show that the vibration is worse on higher mileage bikes.
My opinion, replacing original components with new stuff will probably reduce the problem, but you'll never get rid of it that way.
A board member has experimented with increasing the tension on the primary chain tensioner with positive results. Another member has made a toothed belt drive which seemed promising in the early testing.
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Post by timpa136 on Jul 5, 2015 22:55:15 GMT -5
I have one that will stretch out in a straight line open ended, I don't think you would want that one. This is not a recommended modification and it provided less than desirable results.  |
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Post by goandy on Jul 6, 2015 4:06:47 GMT -5
Oh dear I did that except I only did small circular welds below the dimples on the side of the band/basket. Hasn't failed yet but it's only done a couple of hundred kilometers!  |
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Post by timpa136 on Jul 7, 2015 16:58:01 GMT -5
Your circular spots shouldn't cause the same problems I encountered having the whole end welded.
I seem to recall mine failed in a relatively short time but 500 plus miles a week add up pretty fast, too.
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Post by Glenn RE5 on Jul 7, 2015 20:16:52 GMT -5
As a owner of two Yamaha XS500s.... A bike that was tainted by internal chains not being correctly tensioned ......the primary chain on early models ran out of adjustment at around 5000/8000 miles you can start to see the problem .....All the spec was made up on a drawing board not in a workshop ......They never had to tell a owner that they needed a new chain after a year of ownership ......The RE5 primary chain was never up to the job and the tensioner is a joke .....little wonder it was a problem on the twin RE also ......Am sure test bikes when thrashed wore the chains out in 8000 miles ....am sure steady riding would see a whole lot of miles ....A single cylinder bike wears drive chains out at a fast rate due to the pulse ....maybe the RE is the same ......
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Post by Glenn RE5 on Jul 7, 2015 21:12:30 GMT -5
PS i mean the balancer chain on the XS ......
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Post by timpa136 on Jul 7, 2015 21:29:28 GMT -5
.
Glenn RE5 said: Im guessing that this is mostly normal but can be aggravated by worn primary components.
All good points Glenn.
The tensioner rubber wheels were probably affected by the heat as well. I have also seen a blue primary chain
from an owner that let his counter shaft sprocket wear and loosen thereby slinging trans oil and unlike the GT-750 with 2.2 US quarts in the trans, the rotary cannot afford to run a bit low. The bike shop solved transmission failures in the GT-750 by running hypoid gear oil and that is still my preference for protection.
And you also state...A single cylinder bike wears drive chains out at a fast rate due to the pulse ....maybe the RE is the same .....
That is just what I was told. The single rotor actually speeds up and slows down in rotation and a twin would cancel that out. The prototype RE
with the 530 drive chain would just about stretch out to the next swing arm adjuster when they ran it hard at the 3500 +/- RPM inherent spot.
I think worn secondary components, the drive chain then worn trans. bearings contribute first to the excessive vibrations but Wayne states it best.
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Post by Glenn RE5 on Jul 9, 2015 15:31:01 GMT -5
 Odd that only one side of the chain has turned blue ....the other side is normal all the way round ..... |
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