OK, I fitted the rear sprocket earlier, too damn hot to carry on with the front one.
With the original (hopefully well stretched chain) I tightened the chain adjusters all the way and ran out of adjustment.
Once I've fitted the bigger than standard front sprocket, will I be able to tighten the new standard number of links chain properly? Or will I have to remove a link?
If your FJ had the 17/40 should be fine. What year and how many links in chain?
Kurt
just out of interest and slightly off topic, I ran 39/18 for quite a while and it was not happiness, went to 39/17 much nicer.
I suspect 38/18 would be very unhelpful except for highway touring, and absolutely woeful for hill starts with a fully loaded bike.
I've recently fitted 18/38 , no worries around town , excellent on the highway loving the overdrive , have tried a few combos, 15/41 , 15/40/ 16/ 44 16/41 16/40 .17/40 ,17/44 as yet I havnt tried a fully loaded hill start, but I don't carry that much when touring
I went fron the 17/40, to a 18/39 and I love the overdrive effect also.
I don't load the bike down, so these gears really suite the way I ride.
I used a 530-110 link chain and have no problems adjusting.
Leon
The gearing seems to let the engine work better as its actually using the power with the higher gearing and not just revving its arse off
The chain is 110 links. 1990 3cv, not actually counted the links in the old chain, the box with the new chain says 110 links.
Should be good to go. Please let us know how you like the new gearing. :yahoo:
Kurt
Front sprocket now fitted.
Old one looks a "little" worn :pardon: I expected to struggle removing the sprocket, I braced myself while sitting on the bike with my foot on the brake, no resistance at all when undoing :scratch_one-s_head:
That is totally shagged :shok: :negative:
just have to get my mate with the chain tool to remove the old chain, and put the new one on for me.
(http://i143.photobucket.com/albums/r150/210686/FJ1200knackeredfrontsprocket.jpg)
It's not clear in this photo, but, the dark round plastic disc is some sort of sound deadening device? The replacement doesn't have it.
I wonder if that's an original front sprocket? Can't be can it? 51,000 ish on the clock.
Quote from: ELIMINATOR on August 26, 2012, 04:34:48 AM
It's not clear in this photo, but, the dark round plastic disc is some sort of sound deadening device? The replacement doesn't have it.
I wonder if that's an original front sprocket? Can't be can it? 51,000 ish on the clock.
I'd bet that it is. :shok:
Faaaaaarrrrk, fair bet that is original, should of been swapped out 20,000 ks ago :scratch_one-s_head: , you will love the new gearing, no worries about the plastic not being there, , at least you didnt need a rattle gun to undo yours
I also fitted the spin on oil adaptor. :yahoo:
Started the bike up to see if there were any leaks............... sure enough it leaks. :mad:
not an oil leak, petrol from the overflow from the carbs. Treat the old girl nice and this is how she repays me. :ireful:
Might be lack of use at the moment, once the chain is on, take her for a long run and see if it cures itself.
Hmm, how long have I been calling the bike "her" :wacko2:
Quote from: ELIMINATOR on August 26, 2012, 04:34:48 AM
(http://i143.photobucket.com/albums/r150/210686/FJ1200knackeredfrontsprocket.jpg)
It's not clear in this photo, but, the dark round plastic disc is some sort of sound deadening device? The replacement doesn't have it.
Yes, the O.E. Yamaha sprocket had the rubber on both side of the sprocket for noise suppression, you can see it clearly here;
Yamaha 17t Sprocket (http://www.rpmracingca.com/proddetail.asp?prod=M%2FC%3A17t)
AS you can see the aftermarket does not use the rubber as seen here;
PBI 18t sprocket. (http://www.rpmracingca.com/proddetail.asp?prod=M/C:18T)
Randy - RPM
rubber rubber rubber every time
i had an aftermarket one and it was sooooo noisy, went back to the rubber Yamaha one and the world is wonderful :good2:
Quote from: FJSpringy on August 27, 2012, 03:34:37 AM
rubber rubber rubber every time
i had an aftermarket one and it was sooooo noisy, went back to the rubber Yamaha one and the world is wonderful :good2:
So did the chain stretch or did the sprockets wear (alot!)? :dash2: :dash2:
I went with 18/38 combo and I love it,worth the money for sure I had to change sprockets,17/39 in 5th I was doing 3800 rpm now I'm doing 3300
That is the most worn sprocket I have ever seen that was still intact [no broken teeth].
:yahoo: :good2: :drinks:
Quote from: bigbore2 on September 12, 2012, 07:20:17 PM
That is the most worn sprocket I have ever seen that was still intact [no broken teeth].
Yes, it looks like he got his moneys worth.
Kurt
Quote from: bigbore2 on September 12, 2012, 07:20:17 PM
That is the most worn sprocket I have ever seen that was still intact [no broken teeth].
(http://www.fjrally.com/picgallery/gallery%2F2008%5FFall%5FRally%2C%5FEast%5FCoast%2Fvarious%20pictures%20off%20sd%20card%2Dcopied%208%2D08%20081%2Ejpg)
I stand corrected.
Baaaa, that bike just needs to have it's chain tightened....many miles left on that sprocket. :dash2:
Quote from: Pat Conlon on September 17, 2012, 04:00:52 PM
Baaaa, that bike just needs to have it's chain tightened....many miles left on that sprocket. :dash2:
Pat, I thought the same thing when I saw that...... Tighten up the chain and stay up one gear too high and clean off any chain lube....
Finally fitted the chain, :blush: someone on the UK FJ site kindly lent me one. Well, I do have three other bikes to ride.
Now, I'm waiting for my mate to cut up a couple of pieces of metal so that I can mount the rear indicators. I removed and sold the Non Fango panniers and topbox, my other bikes can all take luggage, so I didn't really need it. Waiting for the rear side panels I just sourced from E bay, then get it MOT'd and we're up and running. :good2:
Big bonus as well, I paid £500 for the FJ, sold the luggage for £150 :good2:
At the start of the year I had ten panniers and top boxes, now down to three. Garage is much tidier, still overcrowded though.
I have a 38t sprocket on the rear and currently have no idea what the front sprocket is. Around town I have had no issues with difficulty with the gearing. I have not had it on the super slab yet. I have a 18t counter sprocket waiting for me to install when I get the bike back from the head rebuild.
Fred
I reckon 18/38 takes nothing away from the abilities of the FJ. Acceleration is still arm stretching, cruisability is wonderful, its a win win. If you like winning drags from the lights over 50 metres then its not for you, but anything longer and its game on! :greeting:
On the motorway in 5th at 80mph, I dropped into 4th, dropped into 3rd, then dropped into 2nd :good2: Think this was about 8,000 rpm. Bloody hell. I haven't ridden it since August, even with the higher gearing I was still surprised how quick it is. :good2:
I've got 17/40 and it's ok. It's what came on my fj when I bought it. I will probably go 18/38 next and try it out
I have a 18/38 with 530, 110 links. Sits about 3/4 way back. Probably could have went to 109 links BUT I wanted to have a little slack so if I want to install a larger rear sprocket it will probably fit.
In short 18/38 is fine with 110 links :). I think that I read 2 or 3 teeth on the rear equals one tooth on the front. :bye2:
George
A change of 1 tooth on the front sprocket equals ~3 teeth on the rear sprocket in RATIO.
Diameter of sprockets (for a given chain pitch) determines diameter of the sprocket and therefore chain length needed with axle in Xposition.
You won't be able to go to 109 links on the chain unless you can find a "1/2 link". I haven't seen one of those in many years. So, you'll have a choice of 110, 112, 108 etc. and will have to adjust axle position to suit, if you can.
So endith the lesson. :-)
Arnie
Quote from: movenon on April 20, 2013, 01:46:21 PM
I have a 18/38 with 530, 110 links. Sits about 3/4 way back. Probably could have went to 109 links BUT I wanted to have a little slack so if I want to install a larger rear sprocket it will probably fit.
In short 18/38 is fine with 110 links :). I think that I read 2 or 3 teeth on the rear equals one tooth on the front. :bye2:
George
My 84 came with 17/42, but went to the 18/38 as per recommendation here and I was getting ready for a 3500 mi. trip. 18/38 is a must on the highway for any distance and is still no problem starting out from a stop at lights etc. in town with the 18/38 gearing. However, around town i like the 17/42 for the extra surge one gets with lower gearing. It is easier for me to tune the bike also with a more responsive engine in the lower gearing [17/42]. I just thro on the 18/38 for any long distance riding and keep the 17/42 on for around town.
I tested the 18/38 combo and I didn´t like it at all... so if anyone is interested about to buy a cheap 18/38 combo (Renthal front and JT rear), I sell it
Less than 500 kms on both sprockets
Rear fit only GSXR rear rim conversion
Quote from: bigbore2 on April 21, 2013, 02:42:13 AM
My 84 came with 17/42, but went to the 18/38 as per recommendation here and I was getting ready for a 3500 mi. trip. 18/38 is a must on the highway for any distance and is still no problem starting out from a stop at lights etc. in town with the 18/38 gearing. However, around town i like the 17/42 for the extra surge one gets with lower gearing. It is easier for me to tune the bike also with a more responsive engine in the lower gearing [17/42]. I just thro on the 18/38 for any long distance riding and keep the 17/42 on for around town.
Just how hard do you need to ride around town?
I'm curious, what do you consider a long enough ride to change the sprockets and how many times a year do you do this?
Noel (18/41)
Quote from: ribbert on April 21, 2013, 05:41:56 AM
Just how hard do you need to ride around town?
I'm curious, what do you consider a long enough ride to change the sprockets and how many times a year do you do this?
Noel (18/41)
I think you've just started a new trend in the way to sign off.
Pete (18/42) :i_am_so_happy:
4,750 = about 90mph. :good2:
Here in Albuquerque we have 2 interstate freeways intersecting [east-west and north-south] in the center of town. Population around 400,000. Not a podunk village with a little main street. I grew up in one of those. Freeway ramps are a good place to hammer the throttle while keeping things relatively safe for all concerned. Speed limit on the freeways are 65 mph. Don't know the kph conversion. ~ 105kph? For a speed run, just go 6-8 miles to the edge of town and hammer it.
I am turning 59 in May. Maybe I should drop "hammer it" from my vocabulary.
I plan on another trip to Wisconsin in a few months, 3500 mi. round trip, I will put on the 18/38 gearing for that. If I was going 200-300 mi in a day, or more, I would put the 18/38 gearing on.
barry [17/42, 18/38]
Just fitted the 18t front sprocket to go with the existing 38t rear. I like it a lot, it suits my riding. I'm not looking for 6th gear so much either.
Mark M
With the 18/38 gearing, the acceleration drops off above 130 :good2:Still left the Audi TT driver in my wake though, before I backed off at 145. Next day I took my Guzzi California to work, thought I needed to calm down :diablo: :wacko3:
Quote from: markmartin on April 27, 2013, 10:34:59 PM
Just fitted the 18t front sprocket to go with the existing 38t rear. I like it a lot, it suits my riding. I'm not looking for 6th gear so much either.
Mark M
+1 I took mine out the other day for the first time since all the mod's and I also enjoyed the 18/38 combo especally in stop and go traffic. Found myself not shifting gears as much.
Eliminator: 145 wow ! I think the fastest I have ever been on a motorcycle is 115, maybe 120 on a burst of speed. Don't know exactly because my eyes were out in front :rofl2: I did go about 100-110 for about 80 miles straight one time in Nevada (lots of straight roads in Nevada, I think it was 318). After a while all the "what if's" started to creep into my mind so I decided it was time to slow down. FJ's are runners that for sure. Wonder what the top speed would be with 18/38 gears..... Let me know if you find out :yahoo: :yahoo:
Cheers George
Quote from: movenon on May 02, 2013, 09:40:09 AMWonder what the top speed would be with 18/38 gears..... Let me know if you find out
You can use the calculators to figure that sort of thing out. In theory, assuming a 170/60-17 tire that neither grows nor slips at those kind of speeds (we'll pretend it does both and they cancel out), and assuming you've got the horsepower... 18/38 gearing at 9500rpm works out to 176mph. Unlikely that it'd pull that far without some rather serious motor work, though. Peak power is around 8500 with a reasonably stock motor, and that'd give 157mph.
Fast enough to get into an awful lot of trouble in a very short period of time, anyhow. :)
That's a little faster than I well ever go on 2 wheels.. But it's nice to know :). Think I will just go to the Salt Flats and watch.. The 18/38 combo for me seems to work just fine for me.
George
:wacko1: :wacko1: :wacko1: :wacko1:
OK, so I am running 17/41 on stock wheels and tires. I am looking to reduce vibration and RPM's at highway speeds.
If I am understanding correctly, if I go 18/38 I will be kookaloo. If I change one sprocket or the other I will be half kookaloo as 17 to 18 would be the same as going from 41 to 38. :mail1:
I just received the invoice for the work the previous owner had performed before he let the bike sit for a couple of years. It totaled $1342.52 (got to love dealers $$$) and included new sprockets and chain. The chain listed is RK506120 530XSO-120. The other work included oil/filter change, carb overhaul, rotor replacement and three sets of brake pads.
So, my questions are... if I was going to just change the front or back sprockets which would be better and if I change them both would I have to shorten the chain?
Thanks,
Jeff (17/41)
hmm, I'm no expert, but, I'm sure I read that if the front sprocket is increased in teeth number, then as well as dropping the revs for any given speed, the chain leads an easier life.
Anyone correct me on that if I've made an error.
I assume :wacko3: that as the sprocket is larger the chain links do no rotate as much as on a smaller sprocket.
The 18/38 combination does not leave a lot of room for chain adjustment, but, I'll have to see how it goes.
I got 48mpg, (remember this is a bigger gallon than yours in the States) this includes the very short 145mph burst, and some 80 to 90mph runs.
Quote from: CatTomb on May 06, 2013, 09:59:35 AM
So, my questions are... if I was going to just change the front or back sprockets which would be better and if I change them both would I have to shorten the chain?
Thanks,
Jeff (17/41)
Maybe not. I had the 17/41, now have the 18/38 and didn't have to change the chain length, though the wheel is further back. That's not a definite answer but I hope it helps.
Mark M
Quote from: markmartin on May 06, 2013, 05:28:26 PM
Quote from: CatTomb on May 06, 2013, 09:59:35 AM
So, my questions are... if I was going to just change the front or back sprockets which would be better and if I change them both would I have to shorten the chain?
Thanks,
Jeff (17/41)
Maybe not. I had the 17/41, now have the 18/38 and didn't have to change the chain length, though the wheel is further back. That's not a definite answer but I hope it helps.
Mark M
+1 Same as Mark said. Wheel sits a bit more to the rear... 18/38 on mine. 110 link chain
George