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+--- Thread: Bigger front sprocket (/showthread.php?tid=79456)
Re: Bigger front sprocket - Disorderlypunk - 29-03-18
yeah i was cleaning the chain and decided to just start her up and let her spin the wheel on the paddock stand as i sprayed the hose at it to remove the cleaner and it was bouncing all over the place- turns out it was just riding the front sprocket a bit - its fine when its under load
Re: Bigger front sprocket - darrsi - 29-03-18
(29-03-18, 03:21 PM)Disorderlypunk link Wrote: yeah i was cleaning the chain and decided to just start her up and let her spin the wheel on the paddock stand as i sprayed the hose at it to remove the cleaner and it was bouncing all over the place- turns out it was just riding the front sprocket a bit - its fine when its under load
It's the momentum of the wheel gaining speed but the chain won't let it go faster than the engine speed, which causes that shuddering effect.
Get quite a few people freaked out by it when it happens, but as you say just a very tiny bit of throttle levels it out.
Re: Bigger front sprocket - Triggergee - 31-03-18
17 tooth sprocket arrived today, big bastered... as soon as it stops raining I'll attempt to fit it and let you all know my opinion.
Re: Bigger front sprocket - His Dudeness - 31-03-18
I've a theory that it's the exhaust resonating at 6k that causes the problem. I just need someone mad enough to go flying up the road with no exhaust to test the theory :lol
Re: Bigger front sprocket - Disorderlypunk - 31-03-18
(31-03-18, 03:55 PM)His Dudeness link Wrote: I've a theory that it's the exhaust resonating at 6k that causes the problem. I just need someone mad enough to go flying up the road with no exhaust to test the theory :lol
done it - for some reason people kept looking at me
Re: Bigger front sprocket - celticdog - 31-03-18
(28-03-18, 11:19 PM)Disorderlypunk link Wrote: funny you should mention that after i have spent an hour killing myself over that today
with the wheel in the air it was shaking around like mad but when under pressure no problem at all
without a laser alignment tool its hard to be sure but them lines are the best we have - they are made in a pretty accurate JIG but as time passes we lose alignment through bearing wear etc
I usually measure the length of the stud protruding with a small steel rule after a visual line up with the swing arm markings, seems to work for me.
(29-03-18, 04:16 PM)darrsi link Wrote: [quote author=Disorderlypunk link=topic=23930.msg277456#msg277456 date=1522333313]
yeah i was cleaning the chain and decided to just start her up and let her spin the wheel on the paddock stand as i sprayed the hose at it to remove the cleaner and it was bouncing all over the place- turns out it was just riding the front sprocket a bit - its fine when its under load
It's the momentum of the wheel gaining speed but the chain won't let it go faster than the engine speed, which causes that shuddering effect.
Get quite a few people freaked out by it when it happens, but as you say just a very tiny bit of throttle levels it out.
[/quote]
lol, that's my method for applying grease to the chain, set it spinning (gentlly).
(31-03-18, 05:05 PM)Disorderlypunk link Wrote: [quote author=His Dudeness link=topic=23930.msg277586#msg277586 date=1522508143]
I've a theory that it's the exhaust resonating at 6k that causes the problem. I just need someone mad enough to go flying up the road with no exhaust to test the theory :lol
done it - for some reason people kept looking at me
[/quote]
Lol I too like this theory, I've often wondered if it's anything to do with the camshaft rpms, it's about this range 5-6k that the powerband kicks in.
(31-03-18, 02:23 PM)Triggergee link Wrote: 17 tooth sprocket arrived today, big bastered... as soon as it stops raining I'll attempt to fit it and let you all know my opinion.
Looking forward to your verdict fella :thumbup
Re: Bigger front sprocket - agricola - 31-03-18
(28-03-18, 11:19 PM)Disorderlypunk link Wrote: funny you should mention that after i have spent an hour killing myself over that today
with the wheel in the air it was shaking around like mad but when under pressure no problem at all
without a laser alignment tool its hard to be sure but them lines are the best we have - they are made in a pretty accurate JIG but as time passes we lose alignment through bearing wear etc
I dont have the confidence in the marks on the swingarm. Last two times ive had to do it, ive set up two strings down the sides of the bike and measured from the wheels. The chain seems to sit better in the sprocket teeth this way.
Re: Bigger front sprocket - fazersharp - 31-03-18
(31-03-18, 08:19 PM)agricola link Wrote: [quote author=Disorderlypunk link=topic=23930.msg277423#msg277423 date=1522275556]
funny you should mention that after i have spent an hour killing myself over that today
with the wheel in the air it was shaking around like mad but when under pressure no problem at all
without a laser alignment tool its hard to be sure but them lines are the best we have - they are made in a pretty accurate JIG but as time passes we lose alignment through bearing wear etc
I dont have the confidence in the marks on the swingarm. Last two times ive had to do it, ive set up two strings down the sides of the bike and measured from the wheels. The chain seems to sit better in the sprocket teeth this way.
[/quote]
I think I know the way you are talking but - more detail please.
Re: Bigger front sprocket - Triggergee - 03-04-18
Bad news foccers, 17 tooth doesn't fit :'( chain just not quite long enough. I'll contact JT at some point and see if I can get extra links for the chain.
Re: Bigger front sprocket - Disorderlypunk - 04-04-18
(28-03-18, 09:26 PM)Disorderlypunk link Wrote: i have a feeling if you go 17 it will be a remeasure and longer chain so your stuck with it once riveted or throwing money away
i think we are at 110 links standard
i think someone already foresaw that one - ooh yeah me :lol :lol :lol
Re: Bigger front sprocket - agricola - 04-04-18
(31-03-18, 08:40 PM)fazersharp link Wrote: [quote author=agricola link=topic=23930.msg277601#msg277601 date=1522523967]
[quote author=Disorderlypunk link=topic=23930.msg277423#msg277423 date=1522275556]
funny you should mention that after i have spent an hour killing myself over that today
with the wheel in the air it was shaking around like mad but when under pressure no problem at all
without a laser alignment tool its hard to be sure but them lines are the best we have - they are made in a pretty accurate JIG but as time passes we lose alignment through bearing wear etc
I dont have the confidence in the marks on the swingarm. Last two times ive had to do it, ive set up two strings down the sides of the bike and measured from the wheels. The chain seems to sit better in the sprocket teeth this way.
[/quote]
I think I know the way you are talking but - more detail please.
Two string lines, one down each side of the bike, tied around the rear wheel so that the strings just kiss the front and rear edges of the tyre, with bike on centre stand. Strings taut and fastened to something to hold them taut beyond the front wheel. Use eyesight to align front and rear tyers as near central as you can. Use the rear wheel adjusters to align rear with front, might sound complicated but its a doddle, there is only one point at which the measurement from the strings to the tyre edge of each tyre is equal. Note front and rear measurements will not be the same due to tyre size difference. Take note of chain tension while adjusting. Hope that helps. Im sure others swear by other methods, but this is the method ill use and will continue to use until I come across a more accurate way of doing it, so there :moon
[/quote]
Re: Bigger front sprocket - celticdog - 04-04-18
(03-04-18, 10:20 PM)Triggergee link Wrote: Bad news foccers, 17 tooth doesn't fit :'( chain just not quite long enough. I'll contact JT at some point and see if I can get extra links for the chain.
The other option, elongate the slots on the swingarm
Re: Bigger front sprocket - Triggergee - 04-04-18
(04-04-18, 03:55 PM)celticdog link Wrote: [quote author=Triggergee link=topic=23930.msg277785#msg277785 date=1522790438]
Bad news foccers, 17 tooth doesn't fit :'( chain just not quite long enough. I'll contact JT at some point and see if I can get extra links for the chain.
The other option, elongate the slots on the swingarm
[/quote]
Ah cool didn't think of that, don't suppose it really matters where the brake caliber is in relation to the disc. As soon as I've finished cleaning petrol off my kitchen floor from washing out my forks I'll get the angle grinder out and cut out an inch from either side :lol
Re: Bigger front sprocket - Disorderlypunk - 04-04-18
(04-04-18, 04:56 PM)Triggergee link Wrote: [quote author=celticdog link=topic=23930.msg277815#msg277815 date=1522853748]
[quote author=Triggergee link=topic=23930.msg277785#msg277785 date=1522790438]
Bad news foccers, 17 tooth doesn't fit :'( chain just not quite long enough. I'll contact JT at some point and see if I can get extra links for the chain.
The other option, elongate the slots on the swingarm
[/quote]
Ah cool didn't think of that, don't suppose it really matters where the brake caliber is in relation to the disc. As soon as I've finished cleaning petrol off my kitchen floor from washing out my forks I'll get the angle grinder out and cut out an inch from either side :lol
[/quote]
STOP - think what your doing first bloody hell i dont know if your joking or not so i will put this anyway
you will hit your cross brace on the swingarm you will get so close it will at least be rubbing
Re: Bigger front sprocket - Triggergee - 04-04-18
(04-04-18, 05:51 PM)Disorderlypunk link Wrote: [quote author=Triggergee link=topic=23930.msg277818#msg277818 date=1522857367]
[quote author=celticdog link=topic=23930.msg277815#msg277815 date=1522853748]
[quote author=Triggergee link=topic=23930.msg277785#msg277785 date=1522790438]
Bad news foccers, 17 tooth doesn't fit :'( chain just not quite long enough. I'll contact JT at some point and see if I can get extra links for the chain.
The other option, elongate the slots on the swingarm
[/quote]
Ah cool didn't think of that, don't suppose it really matters where the brake caliber is in relation to the disc. As soon as I've finished cleaning petrol off my kitchen floor from washing out my forks I'll get the angle grinder out and cut out an inch from either side :lol
[/quote]
STOP - think what your doing first bloody hell i dont know if your joking or not so i will put this anyway
you will hit your cross brace on the swingarm you will get so close it will at least be rubbing
[/quote]
Oh shit I wish I read that ten minutes ago! Anyone know if it's possible to weld some sheet metal or something back on to the swing arm?
Re: Bigger front sprocket - Disorderlypunk - 04-04-18
its ally so would need tig welded
Re: Bigger front sprocket - Triggergee - 04-04-18
It's alright, I'm only joking :rollin :rollin :rollin
Re: Bigger front sprocket - Disorderlypunk - 04-04-18
ooh thank god for that
Re: Bigger front sprocket - Millietant - 06-04-18
Rather than gong up 2 teeth on the front, I usually go 1 tooth up on the front and 2 teeth down on the back - pretty much the same overall ratio change, but it also means the standard chain length is perfect.
I'm not a fan of adding just a couple of links - no reason other than my own mental issues of 2 home done links in the one chain
Re: Bigger front sprocket - Disorderlypunk - 07-04-18
(06-04-18, 10:51 PM)Millietant link Wrote: Rather than gong up 2 teeth on the front, I usually go 1 tooth up on the front and 2 teeth down on the back - pretty much the same overall ratio change, but it also means the standard chain length is perfect.
I'm not a fan of adding just a couple of links - no reason other than my own mental issues of 2 home done links in the one chain
yep the correct way is to do that that, i think the idea here is a quick switch (15 mins to switch and adjust for front sprocket)
im not doing a full maths spreadsheet on this (i said that last time lol)
i have a feeling not everyone here has a paddock stand to do full switches so its just easier
and also its £5 for a front sprocket and much more for a rear so quick switch is worthy of a trial run
-- if we dont test run it we dont know ----