2010 Gt650r fork preload adjusters broken?
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Hi guys, I decided to start a new post based on the next stages of my gt650r project after finally getting her running. I plan on moving onto the forks and front brake master cylinder as they have been clearly screwed with by the previous owner.
I’ve posted some pictures of the top of my forks and the front brake master cylinder. The left fork is fine with the preload adjuster in tach with around 10-12 clicks of adjustment. All is normal there. The right fork on the other hand has its preload adjuster sunken and it only spins, it doesn’t click. Some ham fistedness has been at play there! And then there’s the state of the master cylinder. From what I can tell, the site glass may of started to weap and the previous owner smeared araldite on it to seal it up and its rock solid. 🤦♂️
The master cylinder is easy enough to just replace but the right fork is a bit of a concern. Im no stranger to bikes and have removed and serviced forks before but what can I expect to see when I pull the right fork? Is the preload adjuster screwed? Is it repairable?
On the other hand, has anyone done a front end conversion on a gt650r? A gsxr front end perhaps? Is there a better upgraded for the master cylinder? A nissin one from gsxr?
Any ideas or suggestions would be greatly appreciated.
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You can put a whole R6 front end fork as the older r6 should have 51mm tubes but….the issue is that the r6 wheel won’t be compatible with the Hyosung speedo drive, so you may have to use the GT rim and some possible alterations to the spaces to make sure everything aligns for the calipers not to grind the discs. Also you will end up using a whole R6 brake system from master cylinder down to the calipers themselves as Hyosung calipers won’t fit correctly on R6 forks unless you modify mounts!
It is possible you may have to replace the whole “Top Nut” section of the fork if keeping the 650 0ne (not unless you strip the fork and see a part broken inside (one way to find out!)
// Meditation doesn't mean you have to sit still....
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Thanks Marcel for the info. All just food for thought at the moment, but realistically speaking, a front end conversion is more of a curiosity than anything. Just curious to see what other guys have done with these things!? I’d likely just keep the stock hardware and just fix/service what I got, especially given that im on a very tight budget and just need it all to work so it can pass its roadworthy inspection eventually!
I’ll likely drop the forks out soon and inspect for anything that’s broken. Might even be able to source a decent 2nd hand right fork for cheap along with a master cylinder. We’ll see. I’ll keep you posted. 👍
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So ive been busy ticking off some boxes on my project gt650r. I’ve had the forks out and done a dump and run service on them as demonstrated by Dave Moss. Thanks Mossy! One fork had 320ml and the other had 350ml. Manual says they’re meant to have 400ml! The seals are ok and haven’t been leaking so more evidence of ham fistedness there. Ive put 15w oil in as it was cheaper than 10w at the time. Will have the adjusters set softer and dial them in better when the time comes. Speaking of adjusters, they all seem fine. The previous owner pushed one in but it was easy enough to push back up with the cap off. The adjusters prongs still align and engage with the inner rod inside the forks so all seems fine. They just don’t click anymore, Just spin which is fine as plenty of forks out there do that normally. As long as they work then I’m happy. I’ve had the triple clamps out, cleaned, inspected, re-greased the bearings and reinstalled. Ive removed the callipers to give them a good clean focusing on all components to remove old road grime and brake dust. Gave the seals, pistons and pad locating pins light lubrication. The front end is back in and torqued to factory specs. While I was at it, I removed the lams throttle plate restrictor too. It was easy. I put the front fairing cowl, screen, and mirrors back on too. Ive decided to leave the rest of the fairings off going for a look combining the look of gt650r and gt650s as i like the look of the engine exposed. Removed all unecessary brackets and clutter. All is coming together slowly!
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Nice work!!!!!
Also i suppose a tutorial is needed for your fellow citizens to see how you bypassed the restrictions on the intake system , they will thank you for it haha.
I bet you can’t wait to finish it and catch the sun now , (don’t rush though lol)
// Meditation doesn't mean you have to sit still....
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Nice work!!!!! Also i suppose a tutorial is needed for your fellow citizens to see how you bypassed the restrictions on the intake system , they will thank you for it haha. I bet you can’t wait to finish it and catch the sun now , (don’t rush though lol)
i might have to look into that Marcel! As far as I knew the lams bikes just had the throttle plate restrictor but have noticed the intake is crammed right in behind the head stem. Any light you could shine on that would be appreciated and I’ll look into it 👍
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More on fork-tuning..: https://racetech.com/emulators/
(I do not know anything about them)
Old and grumpy,(?), have fairly wide engine & tuning experience, "restoring/resto-mod" on cars & mc, worked as electronic tech. (retired).
GT125R - sold. New (used): GT250R-efi
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Nice work!!!!! Also i suppose a tutorial is needed for your fellow citizens to see how you bypassed the restrictions on the intake system , they will thank you for it haha. I bet you can’t wait to finish it and catch the sun now , (don’t rush though lol)
i might have to look into that Marcel! As far as I knew the lams bikes just had the throttle plate restrictor but have noticed the intake is crammed right in behind the head stem. Any light you could shine on that would be appreciated and I’ll look into it 👍
Will need a picture to see what you are elaborating ?
// Meditation doesn't mean you have to sit still....
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