Author Topic: Reed stopper.  (Read 359 times)

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Offline Tigger390

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Reed stopper.
« on: January 21, 2019, 09:25:21 AM »
I am going through some bits for my engine rebuild and as I was cleaning the reed valve assembly I noticed there is no stopper on it. Looking at CMS's diagrams I should have them fitted. A glance at Flebay has shown some for sale with them fitted and one set without.

Do some have them, some not? Is this some sort of modification? Looking at mine I just have 3 screws holding the reeds rather than the load spread across the plate for the stopper, which must stress the reeds around the holes. I am planning on replacing the reeds so if mine are damaged, which they don't appear to be, it doesn't matter.

Thanks

Nigel
2001 Suzuki DRZ400 kicker, 440 kit, ported head, high lift inlet cam, K&N, full FMF exhaust.
2008 KTM 950SMR, Akro's, X Bikes airbox mod & Air filter, tail tidy and loads of carbon.
2002 Honda VFR800 VTEC. Decat headers, K&N, PC3 with custom map and full Honda luggage.
1984 Yamaha IT490L, full DG exhaust. Currently in not so many bits!

Offline storie585

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Re: Reed stopper.
« Reply #1 on: January 21, 2019, 09:55:11 AM »
Original reeds were steel with stoppers. Boysen for example are fiber reeds and I believe their instructions suggest removing the stoppers and using the hardwear they provide (small steel plate / strap). I have always used the stock set up. I read somewhere that the stoppers can be used with the fiber reeds. I actually just put a motor together using the stoppers with boysen fiber reeds. Guess I?ll find out how it performs.
Dave

Offline Tigger390

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Re: Reed stopper.
« Reply #2 on: January 21, 2019, 06:28:30 PM »
Ok, thanks that's interesting. My reeds are fibre and I was planning on replacing them with Boyesen reeds. Looking around on other sites you find the usual remove them for better performance advice with the contrasting, don't do it as your reeds won't last as long and break etc etc etc.

Thanks again

Nigel
2001 Suzuki DRZ400 kicker, 440 kit, ported head, high lift inlet cam, K&N, full FMF exhaust.
2008 KTM 950SMR, Akro's, X Bikes airbox mod & Air filter, tail tidy and loads of carbon.
2002 Honda VFR800 VTEC. Decat headers, K&N, PC3 with custom map and full Honda luggage.
1984 Yamaha IT490L, full DG exhaust. Currently in not so many bits!

Offline Martin I Henry

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Re: Reed stopper.
« Reply #3 on: January 21, 2019, 06:48:25 PM »

IT490's are not my area of expertise, but I seem to remember that some people have running issues after installing fibre reeds.

Just something to bear in mind.

Cheers,

Dave.

Offline Tigger390

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Re: Reed stopper.
« Reply #4 on: January 21, 2019, 11:23:15 PM »
So you think genuine metal??
2001 Suzuki DRZ400 kicker, 440 kit, ported head, high lift inlet cam, K&N, full FMF exhaust.
2008 KTM 950SMR, Akro's, X Bikes airbox mod & Air filter, tail tidy and loads of carbon.
2002 Honda VFR800 VTEC. Decat headers, K&N, PC3 with custom map and full Honda luggage.
1984 Yamaha IT490L, full DG exhaust. Currently in not so many bits!

Offline storie585

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Re: Reed stopper.
« Reply #5 on: January 22, 2019, 12:11:53 AM »
Metal- yes.. kind? Steel for sure. Spring steel? Stainless?
Dave

Offline Tigger390

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Re: Reed stopper.
« Reply #6 on: January 22, 2019, 07:25:58 AM »
Ordered OE Yamaha metal (whatever they are made of!) and stoppers. So now can start with OE and try putting fibre ones in later if I decide I want to experiment.
2001 Suzuki DRZ400 kicker, 440 kit, ported head, high lift inlet cam, K&N, full FMF exhaust.
2008 KTM 950SMR, Akro's, X Bikes airbox mod & Air filter, tail tidy and loads of carbon.
2002 Honda VFR800 VTEC. Decat headers, K&N, PC3 with custom map and full Honda luggage.
1984 Yamaha IT490L, full DG exhaust. Currently in not so many bits!

Offline storie585

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Re: Reed stopper.
« Reply #7 on: January 22, 2019, 08:45:49 AM »
Yep.. I?m doing the same thing not that I have a baseline knowledge of how all the variables work together. My bikes are all set up pretty similar with jetting, timing & exhaust. Porting is a little different but it will be interesting with this new build to see how the boysens work..
Dave