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Post by budgie on Nov 21, 2015 9:29:37 GMT 1
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Post by LC_BOTT on Nov 21, 2015 9:39:36 GMT 1
I've not had one of these, I got one from Norbo in the end as an exchange item, cost less but was a standard crank. When I started to look at uprated stuff, nearly all of them had welded crank pins, and therefore virtually scrap if it required a rebuild in the future, as no one will do it.
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Post by 4l04ever on Nov 21, 2015 12:01:11 GMT 1
Grampian will rebuild/repair welded cranks.... :-)
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Post by 4l04ever on Nov 21, 2015 12:03:33 GMT 1
Did you see the spec on the race bike he has at the bottom of the advert??? 83bhp at the back wheel.....my arse! :@)
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Deleted
Deleted Member
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Post by Deleted on Nov 21, 2015 12:21:47 GMT 1
any one near them to check them out?
seems like a good price for a crank, mine was 400 quid ($800) in Aus form TSS
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Post by chippy348 on Nov 21, 2015 18:35:52 GMT 1
I think you will find they are made in Taiwan and will have Taiwanese rods and bearings.
Grampians might well build welded cranks but you have to be very careful as they are usually welded as they have got loose and sloppy on the holes on the webs.
I learnt the hard way with this and still have a crank under my bench that had twisted and got welded and broke the weld and twisted again.
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Post by budgie on Nov 21, 2015 19:37:43 GMT 1
Thanks for the reply guys, sent mine, std unit to PJME and they have just informed me its scrap... All pins are shot and loose in webs so by the time I rebuild its cheaper to buy new... But there's is nearly £360...and is listed as Taiwanese...so guess probably the same crank.... .?! Anybody had a PJME crank?.... It's only to go in a std motor and will not get the Arse thrashed out of it.... Honest.. (:-)  Gav |
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Post by budgie on Nov 21, 2015 20:31:21 GMT 1
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Post by LC_BOTT on Nov 21, 2015 22:40:31 GMT 1
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Post by JonW on Nov 22, 2015 3:00:05 GMT 1
Amazing... why would you pay 360 quid (US$550) for that when a brand new OEM yamaha crank can be had in the usa from the online sellers for just over $400?
Even with postage and imports it would still be a better crank for much the same money, ie 400ish quid...
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Post by bare on Nov 22, 2015 4:21:27 GMT 1
Taiwanese?? Good luck with that! IF Taiwanese those would be at least serviceable.
See copper coloured Rods..a Simple telltale.
Welded NEW cranks are Garbage.
Their welds have proven to Fail within the first Few hours of use.
Just because we Fool with old Bikes .. it does not Follow that we are naive idiots.
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Mad Biker
Drag-strip hero
We lead others try and follow.
Posts: 243
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Post by Mad Biker on Nov 24, 2015 19:23:52 GMT 1
There are plenty of reasons why you would pay £360 for an aftermarket crank over a new oem Yamaha
I have done a lot of research and testing of different make cranks and components, using myself and various other riders. In that time we have managed to snap a standard Yamaha conrod. We have never snapped a Hotrods conrod. We have managed to have big end bearings break up on standard oem ones. We have never broke one of the flat cage big ends up, which are standard on hotrods.
For the same price as a Yamaha oem crank you can have the upgraded 10 ball outside bearings, which take a lot more load. The one part of the oem crank I would say is better is the centre bearings, but the standard Tpi centre ones that come on a hotrods are good enough to last until everything else is worn anyway.
I can only speak for the product I supply not for the others on the market. There is nothing wrong with an OEM crank its very good, but if your comparing pound for pound there are better on the market, as the limits of an oem crank will be found earlier.
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Post by looey on Nov 24, 2015 20:03:07 GMT 1
If it's any help, my YPVS engined Hybrid has one of Martin's (Mad Biker Designs) Pro Spec Hotrod cranks fitted.
I had the same problem with a shot crank that couldn't be rebuilt, and after a bit if research, that's what I settled on.
Martin's a good bloke to deal with if that's the path you choose.
Good luck
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Post by budgie on Nov 24, 2015 22:24:59 GMT 1
Thanks Guys
All good advice, I have been offered a replacement rebuilt crank for sensible dollar, so have gone that way, however I have another build pending and I will be giving Martins crank a go, as its a race engine next for me... Appreciate the comments and feedback guys....
Gavin
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Post by JonW on Nov 25, 2015 7:07:25 GMT 1
There are plenty of reasons why you would pay £360 for an aftermarket crank over a new oem Yamaha. Ahh, ooops. Not a dig at your crank Martin, I was aiming my comment at the OP, ie the first post - hence the price quoted, not what was said in between and was no slight on you etc. I do agree that there are plenty of cranks I would buy for 360quid that werent OEM Yam, but my point was that the top one was not one of them. Random online/ebay sellers do not make good crank suppliers IME. (and ive been there) Hotrods had their ups and downs a few years back but seems the modern supply is good form what you stated. That's good news for those who want a new crank as they can buy a unit from a trusted supplier. |
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Mad Biker
Drag-strip hero
We lead others try and follow.
Posts: 243
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Post by Mad Biker on Nov 25, 2015 8:59:45 GMT 1
No offence taken Jon, i just wanted to share my findings. its taken a good few years, a good few cranks and a god few problems to find that out, so hopefully it can short cut it for others in the future.
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Post by JonW on Nov 25, 2015 12:16:37 GMT 1
Phew, thats cool. Yeah the Banshee tie up has been a blessing for many parts for us, but also a curse where other things are concerned. The LC has a much better hit rate with stuff like this as any fool seems to be able to set up an ebay or online shop and flog banshee parts to 14yr olds who need to be back 'racing' on the weekend, all that is required to make the sale is that the parts are cheap and to talk it up, as they will be rebuilding the machine in a month anyway LOL
Anyway point is; it's always worth 'investing' in a crank, no matter where/whom you decide to buy it from. Its the heart of the motor, so buy cheap or crap and you will just cost yourself more in the long run. Anyone whos been round these bikes for a while will have had experience of bad cranks, but at least in the modern world we have the wherewithal to learn about them and buy from trusted sellers. The old adage to "Buy the seller, not the part" couldnt be more true of cranks.
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Post by yazza54 on Nov 25, 2015 12:53:17 GMT 1
Thanks Guys All good advice, I have been offered a replacement rebuilt crank for sensible dollar, so have gone that way, however I have another build pending and I will be giving Martins crank a go, as its a race engine next for me... Appreciate the comments and feedback guys.... Gavin I got my 7mm crank through Martin, its a Wicked one not Hot Rods. Worth bearing in mind he can source more than what he shows on the website. Impressed so far, it's well balanced.. no nasty vibes like I've heard from some people with long stroke motors. |
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Post by budgie on Nov 25, 2015 16:43:49 GMT 1
I got my 7mm crank through Martin, its a Wicked one not Hot Rods. Worth bearing in mind he can source more than what he shows on the website. Impressed so far, it's well balanced.. no nasty vibes like I've heard from some people with long stroke motors. Cheers for that... The new year will see my race engine build start so I will be back onto everyone to get some feedback as to the best way to go... Gav |
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