Inverted Forks on a ninjette?

sixstring · November 13th, 2009, 10:58 AM

I've seen pics of ninja 250rs with inverted forks but did a google search and couldn't come up with any information on how its done, whats required etc.

Can I fit a ZX6 fork and tripple into a 250r? Maybe a KLX250? The pics I've seen feature gsxr 600 forks on the 250. Not sure if the tripple clamp had to be replaced, but I'm almost certain they have to be.

FYI, I want inverted forks for looks more than anything else.

Alex · November 13th, 2009, 11:39 AM

The one I saw had a complete R6 front end put on to it. I think just about everything needs to be replaced (forks/triples/axle/brakes/wheel/etc), and the steering head on our frame may need to be remachined as well. Check out the Post Your Favorite Pic thread, there is a red machine I believe from Malaysia that had this done.

camaroz1985 · November 13th, 2009, 01:04 PM

If you can find the size of the stock steering stem bearings you can use this link to maybe find something that could work.

http://xjbikes.com/Forums/viewtopic/...ght=xj600.html

blong · November 16th, 2009, 09:14 AM

http://www.ninjette.org/forums/showthread.php?t=25728

I did it with a gsxr front end. All gsxrs use the same steerer tube. All I had to do was swap the lower bearing race. Your fairings won't fit...gotta go naked or go race glass or something.

sixstring · November 17th, 2009, 07:38 AM

I was hoping there'd be more of a straight swap solution but I guess thats not possible

.

Has anyone tried to take the inverted forks of something of similar size/power like a hyosung 250 or a Kawasaki dirt bike? Maybe those would be small enough that you could keep the standard fairings (I'm assuming that the gsxr forks mandated the fairings to be taken off because the forks are too big)?

I remember there being a thread about Indonesian 250 riders and one of them had a pretty awesome fork swap. Any idea if those guys are on the forum?

blong · November 18th, 2009, 10:04 AM

well, depends what you want. you *could* keep the fairings, but you would need riser clip-ons, and the tire hits the bottom part of the fairing, so you'd need to cut that back. also, the fork tubes hit the radiator mounts, so your turning radius will suffer.

blantant · December 1st, 2009, 05:18 AM

Quote:

Originally Posted by blong

http://www.ninjette.org/forums/showthread.php?t=25728

All I had to do was swap the lower bearing race. .

1)are you referring to the bearing race that is pressed into the stem or the one pressed into the frame?

i assume it's the one in the stem, and then use the same 250 ball bearings?

awesome job on that fork swap!

maglin · December 1st, 2009, 03:06 PM

What about the Aprilia Rs 125 or 250 front system?

blong · December 2nd, 2009, 05:11 PM

Quote:

Originally Posted by blantant

1)are you referring to the bearing race that is pressed into the stem or the one pressed into the frame?

i assume it's the one in the stem, and then use the same 250 ball bearings?

awesome job on that fork swap!

yup, just swap the lower bearing race that presses on the the fork's steerer tube and use the little ninja balls

sixstring · December 3rd, 2009, 10:38 PM

I'm glad someone revived this thread

What kind for forks are these?
http://4.bp.blogspot.com/_HQeAjXwUEa...h/dsc02410.jpg

That picture looks like a 250 with inverted forks and stock fairings. I think it may even have clipons but I'm not sure.

I've seen a few pics of 250s with inverted forks and the front fender always has that bloody michillen tire guy on it. Does anyone recognize what those forks came off of?

Better yet, can anyone translate the page that this pic came off of? It seems like theres some sort of explination as to what the owner of the bike has done to make it look like that:

http://pecintaninja.blogspot.com/

blantant · December 5th, 2009, 07:44 PM

Quote:

Originally Posted by sixstring

I'm glad someone revived this thread

What kind for forks are these?
http://4.bp.blogspot.com/_HQeAjXwUEa...h/dsc02410.jpg

http://pecintaninja.blogspot.com/

looks like the same gsxr forks i was asking blong about. i have all the parts ready for the swap as soon as i get some free time. they apparently bolt on easily but aren't perfect. i think they will have some clearance/offset issues which won't matter because my bike is going naked.

check ebay or craigslist. the gsxrs have used essentially the same tripletree and forks for a decade. you should be able to find a good deal.

blantant · December 5th, 2009, 07:49 PM

Quote:

Originally Posted by blong

yup, just swap the lower bearing race that presses on the the fork's steerer tube and use the little ninja balls

nice. thanks blong! very helpful

wyckedflesh · December 6th, 2009, 12:19 PM

You can have a set of Triples, both top and bottom machined using the fork spacing of the stock 250R, but have them machined to fit the larger diameter of the inverted forks. If you can get the spacing right, and find a set that uses the same diameter front axle, you could then use the stock front wheel and speedo assembly of the 250R

November 13th, 2009, 10:58 AM	#1
sixstring ninjette.org member Name: Jerry Location: Ontario, Canada Join Date: Jun 2009 Motorcycle(s): 09 EX250 LE Posts: 117	Inverted Forks on a ninjette? I've seen pics of ninja 250rs with inverted forks but did a google search and couldn't come up with any information on how its done, whats required etc. Can I fit a ZX6 fork and tripple into a 250r? Maybe a KLX250? The pics I've seen feature gsxr 600 forks on the 250. Not sure if the tripple clamp had to be replaced, but I'm almost certain they have to be. FYI, I want inverted forks for looks more than anything else.

November 13th, 2009, 11:39 AM	#2
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	The one I saw had a complete R6 front end put on to it. I think just about everything needs to be replaced (forks/triples/axle/brakes/wheel/etc), and the steering head on our frame may need to be remachined as well. Check out the Post Your Favorite Pic thread, there is a red machine I believe from Malaysia that had this done. __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

December 1st, 2009, 03:06 PM	#8
maglin ninjette.org member Name: xaris Location: greece Join Date: Aug 2009 Motorcycle(s): what else? Posts: 121	What about the Aprilia Rs 125 or 250 front system? __________________________________________________ -This signature rocks!!!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Inverted fork conversion	old3	2013 - 2017 Ninja 300 Tech Talk	69	February 15th, 2014 07:41 PM
Inverted Forks are cool!	choneofakind	Off-Topic	11	December 26th, 2013 09:35 PM
inverted forks	sparkplug896	2008 - 2012 Ninja 250R Tech Talk	6	December 6th, 2013 03:53 PM
[faster and faster] - Nembo Super 32: Inverted engine, anyone?	Ninjette Newsbot	Motorcycling News	0	December 22nd, 2010 04:01 AM
88-07 Forks	SRTie4k	Motorcycle-related	0	October 9th, 2010 06:31 AM

November 13th, 2009, 01:04 PM	#3
camaroz1985 ninjette.org certified postwhore Name: Ryan Location: Carlisle, PA Join Date: Nov 2008 Motorcycle(s): 2008 WR250R, 2006 Ural Raven (Sold), 2009 Versys Green (Sold), 2008 Ninja 250R Green (Sold) Posts: A lot.	If you can find the size of the stock steering stem bearings you can use this link to maybe find something that could work. http://xjbikes.com/Forums/viewtopic/...ght=xj600.html

November 16th, 2009, 09:14 AM	#4
blong ninjette.org member Name: brian Location: San Diego Join Date: Jul 2009 Motorcycle(s): 09 ninja250, 03 sv650 Posts: 47	http://www.ninjette.org/forums/showthread.php?t=25728 I did it with a gsxr front end. All gsxrs use the same steerer tube. All I had to do was swap the lower bearing race. Your fairings won't fit...gotta go naked or go race glass or something.

November 17th, 2009, 07:38 AM	#5
sixstring ninjette.org member Name: Jerry Location: Ontario, Canada Join Date: Jun 2009 Motorcycle(s): 09 EX250 LE Posts: 117	I was hoping there'd be more of a straight swap solution but I guess thats not possible . Has anyone tried to take the inverted forks of something of similar size/power like a hyosung 250 or a Kawasaki dirt bike? Maybe those would be small enough that you could keep the standard fairings (I'm assuming that the gsxr forks mandated the fairings to be taken off because the forks are too big)? I remember there being a thread about Indonesian 250 riders and one of them had a pretty awesome fork swap. Any idea if those guys are on the forum?

November 18th, 2009, 10:04 AM	#6
blong ninjette.org member Name: brian Location: San Diego Join Date: Jul 2009 Motorcycle(s): 09 ninja250, 03 sv650 Posts: 47	well, depends what you want. you could keep the fairings, but you would need riser clip-ons, and the tire hits the bottom part of the fairing, so you'd need to cut that back. also, the fork tubes hit the radiator mounts, so your turning radius will suffer.

December 3rd, 2009, 10:38 PM	#10
sixstring ninjette.org member Name: Jerry Location: Ontario, Canada Join Date: Jun 2009 Motorcycle(s): 09 EX250 LE Posts: 117	I'm glad someone revived this thread What kind for forks are these? http://4.bp.blogspot.com/_HQeAjXwUEa...h/dsc02410.jpg That picture looks like a 250 with inverted forks and stock fairings. I think it may even have clipons but I'm not sure. I've seen a few pics of 250s with inverted forks and the front fender always has that bloody michillen tire guy on it. Does anyone recognize what those forks came off of? Better yet, can anyone translate the page that this pic came off of? It seems like theres some sort of explination as to what the owner of the bike has done to make it look like that: http://pecintaninja.blogspot.com/

December 6th, 2009, 12:19 PM	#13
wyckedflesh ninjette.org guru Name: Mikel Location: Valley of the Sun Join Date: Mar 2009 Motorcycle(s): '09 Blue Kawasaki KLE650 Versys, '95 Ducati 900SS/CR (undergoing track conversion) Posts: 287	You can have a set of Triples, both top and bottom machined using the fork spacing of the stock 250R, but have them machined to fit the larger diameter of the inverted forks. If you can get the spacing right, and find a set that uses the same diameter front axle, you could then use the stock front wheel and speedo assembly of the 250R