I've not had this problem on my 20,000 mile, 2002 but, I did notice that the tickover got a little slower when the engine was getting plenty hot - beyond where the gauge routinely sits.
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I decided to remove the spring that holds the throttle arrangement against the CSM operating plunger (this was many years ago, so excuse the vagueness, but I can photo the spring I'm talking about - it's safely stored in the garage).
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My bike, without this spring, starts fine, but the engine needs some controlling on the throttle for a short while, to stop it stalling. But, I'm a fair-weather rider, so colder days may be much more, er, demanding, to prevent a stall! But this is only as I remember cold-starting bikes before fuel injection became common.
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Also, setting my bike apart from most others, I have my tickover set to 1300 to 1400 revs (Yamaha say 1200 to 1300, I think), because I find it reduces the engine braking a little, making for smoother town progress. Well, for me, anyway.
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What I'm thinking is, can you remove the CSM, by-passing (joining together) the coolant pipes, so you can still use/enjoy the bike whist tinkering/fettling the CSM? I've never done this, I should add.
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Is it not the case that the fast idle is as keen to lift the tickover as it is, so as to get extra exhaust gas through the catalysts; to get them up to operating temperature quickly, so reducing emissions? I have an idea the cats work best at around 600C, and they are a long way from the engine, so getting them hot from a cold start isn't going to be quick without the engine putting some extra gas (fast tickover) through them.
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If you've replaced your exhausts with aftermarket, then the cats aren't there anyway, so the feature, to the extent it works in normal use, is partly redundant anyway, I suspect.
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Happy to be corrected of course! I'm an infrequent user of this bike, so not a regular visitor to this site! I've recently rejoined with a new ID, as my sign-on details and email address had all been lost/changed from my original joining in 2006.
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I decided to remove the spring that holds the throttle arrangement against the CSM operating plunger (this was many years ago, so excuse the vagueness, but I can photo the spring I'm talking about - it's safely stored in the garage).
Â
My bike, without this spring, starts fine, but the engine needs some controlling on the throttle for a short while, to stop it stalling. But, I'm a fair-weather rider, so colder days may be much more, er, demanding, to prevent a stall! But this is only as I remember cold-starting bikes before fuel injection became common.
Â
Also, setting my bike apart from most others, I have my tickover set to 1300 to 1400 revs (Yamaha say 1200 to 1300, I think), because I find it reduces the engine braking a little, making for smoother town progress. Well, for me, anyway.
Â
What I'm thinking is, can you remove the CSM, by-passing (joining together) the coolant pipes, so you can still use/enjoy the bike whist tinkering/fettling the CSM? I've never done this, I should add.
Â
Is it not the case that the fast idle is as keen to lift the tickover as it is, so as to get extra exhaust gas through the catalysts; to get them up to operating temperature quickly, so reducing emissions? I have an idea the cats work best at around 600C, and they are a long way from the engine, so getting them hot from a cold start isn't going to be quick without the engine putting some extra gas (fast tickover) through them.
Â
If you've replaced your exhausts with aftermarket, then the cats aren't there anyway, so the feature, to the extent it works in normal use, is partly redundant anyway, I suspect.
Â
Happy to be corrected of course! I'm an infrequent user of this bike, so not a regular visitor to this site! I've recently rejoined with a new ID, as my sign-on details and email address had all been lost/changed from my original joining in 2006.