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9 Dec 2008
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It sounds like you are wanting an HPN, but instead of using an old donor bike you should start with new parts which will then be modified and improved by HPN. This sort of bike can last a life time and when you think it is at the end of one life time you strip it apart and rebuild it from scratch to start its next lifetime.
hpn
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12 Jan 2009
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Quote:
Originally Posted by gsworkshop
It sounds like you are wanting an HPN, but instead of using an old donor bike you should start with new parts which will then be modified and improved by HPN. This sort of bike can last a life time and when you think it is at the end of one life time you strip it apart and rebuild it from scratch to start its next lifetime.
hpn |
Does it mean that a Hpn modified bike will never have a problem or not will fall down? driveshaft for instance?
I really wonder that.
Sami
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12 Jan 2009
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Quote:
Originally Posted by Samy
Does it mean that a Hpn modified bike will never have a problem or not will fall down? driveshaft for instance?
I really wonder that.
Sami
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Everlasting is a relative term, everything can break.
Guess you refer to the standard paralever driveshafts? Mine broke after more then 150 kkm.
Most HPNs are based on other swing-arm solutions then the standard airheads, they will probably not last forever but I expect the lifespan to be 10-20 times the life of a chain/ sprockets. My plan is to open mine and inspect it after 50kkm.
I guess you know that you can get serviceable driveshafts for the standard GS?
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12 Jan 2009
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Quote:
Originally Posted by AliBaba
I expect the lifespan to be 10-20 times the life of a chain/ sprockets.
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Obviously, but then again you can change the chain/sprocket in 30 minutes every 15000 km's (more or less), even carry a set with you to change in case it wears out somewhere in Ulan Bataar thus being independent of DHL in that respect, have a set of sprockets made in the middle of nowhere in Russia en route to Vladivostok etcetera and so forth. Chain and sprockets are more available than any drive shaft, so given that "everlasting" is a relative term and that everything can break, I'd go for a chain driven bike if I'd go for a really long trip through more or less desolate places - the exeption being Guzzis, of course.
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12 Jan 2009
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I have not met anyone carrying a spare shaft, but I have met people carrying 2 u-joints for the shaft. I would estimate that a set with u-joints is 200 gram. If you like to carry parts, the weight is as follows.
R80/R100GS shaft 1.990 kg
R80G/S shaft 1.104 kg
R1100 shaft 2.376 kh
F650GS (2*Sprocket +chain) 0.220 kg + 0.978 kg + 1.710kg=2.908kg
I don’t know how the weight of the HPN-shaft, I will guess 2.3 kgs.
The R80G/S-shaft will last almost forever.
You will have problems finding chains and sprockets in most of Africa, Asia and South America. Same goes for shafts.
If you change a set with chain and sprockets in 30 mins you work pretty fast. I have 2 bikes with chains and I always use more then 30 minutes. I also need tools hat I don’t carry on the bike. To change a paralever-shaft I will need 2 hours, all the tools are in my toolset.
When I was in Kenya a guy fabricated a front-sprocket. It looked okay, but a few weeks later I met him in Ethiopia. The sprocket had killed his chain and he had used a week to get the bike to Addis Abeba where he waited for parts.
I’m sure you can find similar examples where shafts have broken.
But everything that moves can fail, shafts just lasts a lot longer. It’s not “everlasting” but it outlasts a chain.
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12 Jan 2009
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Quote:
Originally Posted by AliBaba
You will have problems finding chains and sprockets in most of Africa, Asia and South America. Same goes for shafts.
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Really? I thought those countries in particular had a lot of chained bikes, being where most 2 wheelers are used thus having access to at least some sort of chain/sprocket? With regard to your friend: Home-made sprockets are for emergency. The Mondo Enduro guys had one made far East in Russia, and it worked pretty well IIRC. In any case, if a set of chain/sprocket gets you say 15 000 kms and you change to your spare set en route giving you a range of 30 000 kms I'd say you have plenty of options. Plus your old not-so-worn set may be kept as back-up. My point was that if the final drive fails you're probably - but not always - in deeper shit than if you have worn out your chain/sprocket. But by all accounts, I know that the Guzzi shafts too are up to serious km's given a spare u-joint of two. Besides, if you look at it costwise vs total riding lenght I'm sure you're in the same ballpark with chain/sprocket compared to shafts
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12 Jan 2009
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You will hardly find a bike bigger then 200cc. The chains are not the correct sizes and the quality is poor.
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13 Jan 2009
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Quote:
Originally Posted by AliBaba
Everlasting is a relative term, everything can break.
Guess you refer to the standard paralever driveshafts? Mine broke after more then 150 kkm.
Most HPNs are based on other swing-arm solutions then the standard airheads, they will probably not last forever but I expect the lifespan to be 10-20 times the life of a chain/ sprockets. My plan is to open mine and inspect it after 50kkm.
I guess you know that you can get serviceable driveshafts for the standard GS?
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This is not clear for me AliBaba !
Mine is a 96 R80 GS Basic and I am not sure if I need a servicable/greasable driveshaft for it as it is at 50K kms now. Or if it is a good solution?
I don't know if it is helpful carying U joints for that too ! Technically a bit poor yet 
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