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fork swap ground clearance problem pls help

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Ariel Badger
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PostPosted: 22:02 - 23 Apr 2014    Post subject: Reply with quote
The rake will make it very twitchy. A couple of spacers over the springs will stiffen up the front end and raise it a bit but not 4 inches.
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ninoBFU
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PostPosted: 22:43 - 23 Apr 2014    Post subject: Reply with quote
To be honest I wouldn't want to extend the forks if lets say 3" if it would alter the steering and make it as you say lazy..twitchy........I don't know...

The marving 4 into 1 has flat collectors and that might increase the ground clearance. But it's a bit dear at £330 ....
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c_dug
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PostPosted: 23:08 - 23 Apr 2014    Post subject: Reply with quote
In my mind a 4 into 2 system, scooping around the bottom of the engine on each side would look really good, allow you to keep the forks and probably be no more expensive than having other bits custom made in the end anyway.
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sickpup
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PostPosted: 00:12 - 24 Apr 2014    Post subject: Reply with quote
c_dug wrote:
In my mind a 4 into 2 system, scooping around the bottom of the engine on each side would look really good, allow you to keep the forks and probably be no more expensive than having other bits custom made in the end anyway.


Do you consider crashing when going around corners do to the system grounding out a disadvantage or the in excess of £1K bill for the building of this system a problem?
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c_dug
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PostPosted: 07:43 - 24 Apr 2014    Post subject: Reply with quote
Don't go smashing my daydreaming with your logical arguments of economics and functionality, looking cool is the important factor here don'cha know!?
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sickpup
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PostPosted: 18:56 - 24 Apr 2014    Post subject: Reply with quote
c_dug wrote:
Don't go smashing my daydreaming with your logical arguments of economics and functionality, looking cool is the important factor here don'cha know!?


Just think how cool it would look with burns to the legs from the exhaust.
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temeluchus
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PostPosted: 20:58 - 24 Apr 2014    Post subject: Reply with quote
sickpup wrote:

Just think how cool it would look with burns to the legs from the exhaust.


Chicks dig scars.
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sickpup
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PostPosted: 22:27 - 24 Apr 2014    Post subject: Reply with quote
temeluchus wrote:
Chicks dig scars.


But do they like digging burnt leather out of burnt flesh?
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Carvel
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PostPosted: 22:50 - 24 Apr 2014    Post subject: Reply with quote
Fit 19 inch front wheel, enjoy gained ground clearance.
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sickpup
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PostPosted: 22:54 - 24 Apr 2014    Post subject: Reply with quote
Carvel wrote:
Fit 19 inch front wheel, enjoy gained ground clearance.


Sorry, I've forgotten which Blade had a 19" front wheel?
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Carvel
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PostPosted: 23:15 - 24 Apr 2014    Post subject: Reply with quote
Improvise
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lozzypop1
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PostPosted: 23:21 - 24 Apr 2014    Post subject: Reply with quote
sickpup wrote:


But do they like digging burnt leather out of burnt flesh?


Says the man who wooo'd me with photos of his smashed open toe superglued back together?? Thinking
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temeluchus
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PostPosted: 23:31 - 24 Apr 2014    Post subject: Reply with quote
sickpup wrote:
But do they like digging burnt leather out of burnt flesh?


Really kinky ones?
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ninoBFU
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PostPosted: 23:43 - 24 Apr 2014    Post subject: Reply with quote
My motorcycle instructor has 2 pairs of forks, one from a k5 suzuki and he said it was 29.5 inches long 2inch longer than the ones I have now. He will also measure the other pair which is from a k1 1000 with ohlins internals. I will probably end up selling my 954 forks and buy the longer ones from the pair.

No point fusking about with the geometry of the bike or get custom exhausts made. I don't know if the 2 inch increase will be enough and because the forks are at an angle I don't know by how much the clearance will increase to......i am planning to get the marving 4 into 1 flat collector exhaust at some point to increase the clearance a lil but more. And u guess the rear end upgrade will be left for last......but want the bike on the road as soon as possible .... So if I have the same problem with the new front end...I will put the original forks on until li have money to buy the exhaust and I put both things on the bike.
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ninoBFU
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PostPosted: 23:44 - 24 Apr 2014    Post subject: Reply with quote
https://i202.photobucket.com/albums/aa161/nino__/Mobile%20Uploads/0B62C368-1476-4260-BFEE-1BE3B958D666_zpsyzi30vil.jpg
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lihp
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PostPosted: 00:31 - 25 Apr 2014    Post subject: Reply with quote
ninoBFU wrote:

No point fusking about with the geometry of the bike


You will be changing the geometry with 90% of front ends you put on, unless they're the same length as standard, and have the same fork offset on the yokes as standard too.
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kestrel
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PostPosted: 06:24 - 25 Apr 2014    Post subject: Re: fork swap ground clearance problem pls help Reply with quote
ninoBFU wrote:
hi guys just installed a new set of forks on my bike and they are 5inch shorter than the original non usd forks which leaves me with 2.5inch ground clearance......not good.


ninoBFU wrote:
No point fusking about with the geometry of the bike


By installing forks which are 5 inches shorter than original you have already seriously altered the geometry of the bike by reducing both rake and trail. Have a look at the link below it will give you a basic insight into how steering and geometry work, google will find plenty more info on the subject.
You'll often find that what looks cool often doesn't work too well. Don't fall into the form over function trap.

https://bikearama.com/theory/motorcycle-rake-trail-explained/
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sickpup
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PostPosted: 12:41 - 25 Apr 2014    Post subject: Reply with quote
Vincent wrote:
You have to bear in mind that you're trying to fit forks from a twin spar type frame onto a cradle frame - both employ different geometry,


Please explain why you think different frame types necessitate different geometry?
I realise the bikes will have different geometry but that isn't what you are suggesting.

Vincent wrote:
Stinkwheel had the best idea......find out what works from people that have changed the front end on this particular bike....and use that. Let others do the hard, expensive work Wink


That would be getting longer stanchions made up considering the work of fitting the front end is already done. Unsure why this is confusing so many people?
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ninoBFU
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PostPosted: 13:17 - 25 Apr 2014    Post subject: Reply with quote
Vincent wrote:
If you change the length of the stantions, do you need to do anything to the internals of the forks?


Someone here said that spring spacers would need to be fitted...but u will sell these ones and get 2 inch longer ones from a k4 1000...which will bring me closer to the original heigh and if I need more room for ground clearance I'll get the marving 4 into 1 flat collector exhaust system.
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sickpup
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PostPosted: 13:20 - 25 Apr 2014    Post subject: Reply with quote
Vincent wrote:
As the twin spar frame doesn't need to surround the engine.....above and below....it means everything can sit lower to the ground and the engine further forward. Obviously, this has an effect on everything else - suspension, wheel size, headstock height, rider position....etc, etc. Probaly why OPs forks are too short.....nein?


No. The type of frame actually has very little to do with geometry other than the physical constraints placed by frame members in the way. In the case of the GS it is an old bike that was built before the present fashion of making everything compact. It would also probably have had an 18" front wheel. The high headstock is more likely caused by the spine frame design and it was easier to have longer forks rather than drop the headstock.

Vincent wrote:
If you're going to alter the geometry of a bike, personally, I'd prefer to keep some things as they were originaly....project bike or donor bike.....mixing the rear suspension from a twin shock duplex framed bike with the front end from a twin spar monoshock bike, may create problems, with the geometry. 'Only a thought.


Incorrect for reasons stated above.

Where you will find problems is in completely different suspension set ups ie damping, spring rate etc but this would likely happen regardless of where the parts came from.

Vincent wrote:
If you change the length of the stantions, do you need to do anything to the internals of the forks?


Spring spacers of the same length.

Simple thing that everyone misses is that of you change suspension parts there is a lot of internal work to do as well.

<edit> A good point actually now I think about it. Dependant on the fork internals it may be required to machine up a new damper rod which is beyond most amateurs. I would have just fitted a set of forks from a 90> GSXR11 or 90-94 750</edit>
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sickpup
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PostPosted: 14:19 - 25 Apr 2014    Post subject: Reply with quote
Vincent wrote:
And once the constraints placed on a twin shock duplex frame bike were minimised by using a twin spar frame, did this not alter the geometry....or rather the potential to use a better/more favourable to handling geometry?


Not in the way you are trying to suggest no. A bigger difference happened with the arrival of stiff wheels and decent tyres. Before that there was no way to utilise tighter geometry.

In fact I have a VERY tight geometry twin spar bike sat here at the moment.
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