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Post by Mr M T Pockets on Sept 29, 2020 1:30:18 GMT 1
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Post by JonW on Sept 29, 2020 2:03:11 GMT 1
Whats the petal thickness? Someone mentioned that was one of the differences between them and the real deal.
The dont look too bad, has to be said.
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Post by marrcel on Sept 29, 2020 7:34:26 GMT 1
Yeah my chinese copy has 0.6mm thickness and original 0.4. That is a huge difference. The petal becomes much stiffer.
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Post by jon on Sept 29, 2020 8:22:09 GMT 1
Whats the petal thickness? Someone mentioned that was one of the differences between them and the real deal. The dont look too bad, has to be said. We could do with a list of ALL the differences in case someone is had over. I really can’t understand how they get away with the labelling made by Mototassinari on the reeds and box? Jon |
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Post by jessy03 on Sept 29, 2020 10:51:48 GMT 1
I’ve fitted some to an engine which I’m not too bothered about to see how they perform/last, they work ok engine pulls very well, as for longevity who knows, mine were the cheap unbranded ones about £20 pair, I’ve done 1000 miles or so, I wouldn’t risk them on a new engine.
Jess
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Post by tsa on Sept 29, 2020 12:32:11 GMT 1
The petals crack and splinter very quickly but the blocks themselves seem ok as long as they can take the heat and are fuel resistant.
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Post by dusty350 on Sept 29, 2020 14:31:05 GMT 1
They get away with it coz they simply don't care, and have the attitude of "what are you gonna do about it "  Dusty  |
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Post by Mr M T Pockets on Sept 29, 2020 23:26:11 GMT 1
 20200929_223925 by steven smith, on Flickr For anyone interested in the thickness, found a guy one ebay selling V Force 4 Carbon Fibre Reed Valve Petals Kit 0.4mm uk £16.10  20200929_225010[1] by steven smith, on Flickr I brought this from china as well,fake brembo for an r6 ,£25 new , gonna start a argument now but it's way better than the original  china by steven smith, on Flickr |
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Post by bazzer5115 on Oct 8, 2020 14:42:58 GMT 1
I got v-force 3 on my hybrids.
3 months ago I renewed a set on one of them at a cost of approx £30per cylinder.
Just decided to renew reeds on other hybrid (running issues)
They have now doubled in price to approx £62 a cylinder!!!!
What is that all about!?😡😡
Tempted to go for pattern ones
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Post by headcoats on Oct 8, 2020 14:57:56 GMT 1
That's the thing isn't it , The Vforce sound and perform great (have them myself) but come new petals time , it's double everthing , so need 8 new reed petals  I have some TZR/TDR 6 petal reed blocks to try at some point |
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Post by headcoats on Oct 9, 2020 7:49:51 GMT 1
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Post by marrcel on Oct 9, 2020 8:29:43 GMT 1
How do you change the reeds in the vf4. They seemed to be melted or 2k glued in?
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Post by headcoats on Oct 9, 2020 9:34:40 GMT 1
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Post by andy748 on Oct 9, 2020 10:20:01 GMT 1
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Post by headcoats on Oct 9, 2020 10:55:43 GMT 1
Well spotted
Who is going to try them then
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Post by marrcel on Oct 9, 2020 14:22:22 GMT 1
Thx👍 i am going to try that on my chinese copy. |
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Post by andy748 on Oct 11, 2020 19:06:05 GMT 1
Well spotted Who is going to try them then Me mate, ordered them today, wish me luck! Will report back when i get the blocks, reeds will be here this week. Andy. |
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haj
L plate rider.
Posts: 24
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Post by haj on Oct 22, 2020 13:05:12 GMT 1
Hey,
Did anyone actually see these chinese copies fail? Lots of talk about them being poor quality but not many people who actually comment on them.
(I did read TSA's comment)
I've ordered 2 pairs of them just to check them out.. If they look all right I guess I'll give them a go.
Perhaps they'll be less dangerous than my old original reeds - that may have been used since the 80's for all I know.
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Post by JonW on Oct 22, 2020 13:11:35 GMT 1
Thats an interesting question, tho back in the day people suggested that the OEM steels failed, I never had one break. Maybe that only happened to racers? I bent up my reed stops and even removed them, still never broke one or had it go through the engine... and Ive never bought a bike with broken OEM reeds, or one stuck in the crank/piston/head etc
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Post by reedpete on Oct 22, 2020 13:43:13 GMT 1
Back in the day , never saw a steel reed failure even on Tz750 IOM outfit applications....and that’s a serious WOT workload workout.. Head studs/bolts breaking, all the time. Expansion pipes cracking...often
Can’t say it won’t happen but if used as per Yamaha spec...so talk of steel reed failure is not aligned to reality. As for the effects of time, corrosion is about the only thing to look for. Otherwise I have no concern about using 40 year old steel reeds.
Regarding VForce copies, I doubt the copiers really understand the structural demands and requirements of the composite laminate, and from observation looks like regular FR4 grade material. In addition use in a Banshee is quite different to a road/track bike. So there’s probably a difference but to me even that’s not the big topic...trademark and design right violation is where the debate should be.
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lc2
Weekend rider
Posts: 84
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Post by lc2 on Oct 22, 2020 13:53:11 GMT 1
My experience is the same as reedpete and I have never suffered a steel reed failure on road or race bikes, the issue with composite reeds in my experience is the breakdown of the resin and suspect it will become more of an issue with the increased level of ethanol. I have not had a complete reed failure with carbon as on my race bikes they where checked regularly but have seen them deteriorate around the outer edges. The copies re worth a try as long as you monitor the condition .
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haj
L plate rider.
Posts: 24
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Post by haj on Oct 23, 2020 10:56:42 GMT 1
Thanks for the replys  |
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Post by Dieseldog on Oct 24, 2020 14:08:23 GMT 1
Thats an interesting question, tho back in the day people suggested that the OEM steels failed, I never had one break. Maybe that only happened to racers? I bent up my reed stops and even removed them, still never broke one or had it go through the engine... and Ive never bought a bike with broken OEM reeds, or one stuck in the crank/piston/head etc This is from an RD400, happened year gone September on way up to Scotland with the NERDOC. Not my bike but club member. Made a temporary reed from an old milk bottle. Got him from Stirling services to Oban, said he couldn't feel any difference. Never found the broken piece😮  |
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Post by JonW on Oct 24, 2020 22:59:18 GMT 1
Well there ya go. Not quite as common as the scare mongering advice from back in the day, but it can happen.
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Post by reedpete on Oct 25, 2020 19:05:08 GMT 1
By the looks of it that ex reed has a story to tell....
The reed stop marks aren’t normal and the surface seems quite pitted , but that might just be dirt..
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Post by Dieseldog on Oct 26, 2020 13:41:38 GMT 1
By the looks of it that ex reed has a story to tell.... The reed stop marks aren’t normal and the surface seems quite pitted , but that might just be dirt.. Might just be a 40+ yr old reed? Showing isgns of age? - Beleive its a non tuned engine as well. |
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Post by steve63 on Oct 26, 2020 13:51:09 GMT 1
Had a Harpowa one lose a small chunk on a production 350 31K. I was swapping them back to standard as a precaution as we were off on a 2000 mile round trip to Spain. I never noticed anything wrong before I found it.
The bike had previously done almost four seasons on the same reeds so not too bad. Never seen or heard of a steel reed going. A carbon or plastic one would just get eaten and spat out I suppose. No harm done. A steel one on the other hand........
Have to agree about the 400 reed above. Looks to have had a hard life.
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Post by Tobyjugs on Oct 26, 2020 17:57:10 GMT 1
Today I have been making a good set of standard reed blocks up so I can do a fair test against some new design reed blocks for a 4LO engine.
Whilst sifting through all the bits I have, I thought it might be a bit of handy information for you lads to read about the thickness of different reeds.
The standard metal reeds are 0.20 mm thick.
The Yamaha fiber reeds Norbo sell are 0.40 mm thick (This was a surprise). I use these in my modified reed blocks.
I have some single blade fibres in reed blocks supplied by Bob Farnham. These used to be my favourites. These petals are 0.60mm.
I have various other reeds all made from material that looks like different types of carbon fiber. They are all 0.60 mm.
I know the thickness is not the whole story in reed design but i thought it might be handy to post.
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Post by davidrs on Jun 27, 2022 7:52:54 GMT 1
My set of genuine Moto Tassinari V4 reed blocks arrived in the post today, the manufacturer’s website states-
Yamaha RD250, 350 & 400 owners please note: Installing these reed valves will require modification of the intake port of the cylinders. While the bolt pattern is the same, the valve will not just slide in. Material removal on the intake port walls will be required. If you do not have the ability to carry out the modifications please do not purchase the valves.
Before I whip the carbs off, has anyone fitted these and had to perform the above or should we assume this is only applicable to air-cooled RD’s?
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Post by jessy03 on Jun 27, 2022 9:07:06 GMT 1
The v4’s don’t just slide in on the 250/350lc you need to grind the walls away, be careful as they get thin.
It’s not just a case of whipping the carbs off unfortunately- top end strip
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20200928_233108 by steven smith, on Flickr
20200928_232919 by steven smith, on Flickr
20200928_112716 by steven smith, on Flickr
20200928_112206 by steven smith, on Flickr
