Rough warm up?

[philshaq]

Interesting comments about checking valve clearance and adjusting, convinced me I can do it when the bike comes off the road in a couple of weeks.


One final point on the choke, you should always put the choke on before starting,otherwise the engine will flood.


I know that isn't darrsi's question, but thought it worth mentioning. Good luck finding a cure, carb jets sounds like a good call. Keep us updated.

[Dead Eye]

Bike started on the button this morning, and it was much colder than yesterday, then it got a little bit throaty so i tried the choke and it just cut out straight away

Both of mine have done this - I usually have to hold the revs up a bit, and slowly apply the choke until it holds the revs itself. After that its fine

[simonm]

My Fazer doesn't ever start from cold without the choke.  If I do try it the bike is not at all happy to the point where I remember to turn the choke on.  It literally takes 30s-60s before I can turn the choke off and rev without the engine dying.


http://www.horizonsunlimited.com/hubb/te...g-up-51636


"When the engine is cold some of the fuel it gets from the carburettor condenses on the walls of the combustion chamber, so the mixture becomes too lean. The choke compensates for that. It will also open the throttle slightly, compensating for the fact that the engine needs more force to turn, because the oil is cold."

Can you tell me what RPM's the engine runs at idle ?
Does it run roughly ?
When it first starts, if you give it throttle does the engine die ?

[size=1em]My personal opinion is that you should always have the choke on (when the engine is cold) before pressing the starter and that it should run for a minute or so before turning the choke off, testing the throttle, and finally pulling off (allowing the heated grips to warm up too ;-)[/size]

[size=1em]Just my uneducated 2p.[/size]
[size=1em]Simon[/size]

[simonm]

I just wonder if the idle is too high, that's all.

[darrsi]

Idle's about 1200rpm, and when warm is steady as a rock.
The main point of all this is that i've never had to use the choke before, and it's always started first time, and then ticked over quite happily after a quick blip of the throttle.
But within the last week it's suddenly become throaty on start up, which for my bike is out of the ordinary, so i'm just wondering why, especially as the weather is warmer now and it didn't misbehave at all during the really cold weather?
My previous bikes tended to prefer cold weather, whereas the Fazer thrives on warmer climates, which makes it even more puzzling.
Don't get me wrong, it starts, and eventually warms up and runs fine with a bit of nursing, it's not like i can't start it or anything, but there's always a reason when something changes and me being a fussy sod would like to know why! 

[Dead Eye]

Perhaps before hand it had a problem and now its fixed :lol

[darrsi]

Perhaps before hand it had a problem and now its fixed :lol

In that case i need to find out how to make it go wrong again?  :b

[richfzs]

It's because you've been using that activ8 stuff, you've blocked the farkle gland...

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[darrsi]

It's because you've been using that activ8 stuff, you've blocked the farkle gland...

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I know i'm gonna open the can of worms up again by saying this, but i reckon that is part of the reason why the bike has always started so well previously, less friction and all that.
But no doubt you'll all be queuing up to knock that theory down  :lol

[simonm]

Why don't you try starting it from cold tomorrow with the choke on and see what it does? Have the choke on before you start the bike for the first time though.

A motorbike is designed to use choke when it's cold. The only time it wouldn't be needed is possibly the height of summer or warmer climates.

[richfzs]

:agree what Simon said

I've always used choke on to start mine, all the time since it was new.

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[His Dudeness]

I'd also agree with the other lads. If you never had to use the choke in any conditions that would suggest that the bike was running rich. Did you say you put a new air filter in recently? Maybe your old filter was causing a bit of a restriction to air flow and that was causing the bike to run on the rich side and now that you've changed to the new filter you've got more air flow so you need the choke on cold start ups which is the way it should be. That's all guess work though.

[darrsi]

I'd also agree with the other lads. If you never had to use the choke in any conditions that would suggest that the bike was running rich. Did you say you put a new air filter in recently? Maybe your old filter was causing a bit of a restriction to air flow and that was causing the bike to run on the rich side and now that you've changed to the new filter you've got more air flow so you need the choke on cold start ups which is the way it should be. That's all guess work though.

No, that was a few months back, this has happened within the last week.

[richfzs]

I know i'm gonna open the can of worms up again by saying this, but i reckon that is part of the reason why the bike has always started so well previously, less friction and all that.
But no doubt you'll all be queuing up to knock that theory down  :lol

Ok, I'll bite

Friction has nothing to do with the rough idle issue you have now. If it did, the bike either wouldn't turn over on the button, or if friction was actually causing it to stutter / idle roughly, you'd have so much damage going on you'd need a re- bore or a new engine.

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[darrsi]

[quote author=darrsi link=topic=6574.msg1#msg1 date=1362491363]

I know i'm gonna open the can of worms up again by saying this, but i reckon that is part of the reason why the bike has always started so well previously, less friction and all that.
But no doubt you'll all be queuing up to knock that theory down  :lol

Ok, I'll bite

Friction has nothing to do with the rough idle issue you have now. If it did, the bike either wouldn't turn over on the button, or if friction was actually causing it to stutter / idle roughly, you'd have so much damage going on you'd need a re- bore or a new engine.

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[/quote]

I know........  :rollin

[richfzs]

I hate fishing, it's a stupid sport

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[His Dudeness]

No, that was a few months back, this has happened within the last week.

Damn! I thought that was a good theory :lol Here rich I reckon this is all a ruse! He's fabricated this whole story so he can come on here and post about some magic elixir that gives perfect starts every time. Funnily enough it will be called Startsi which is suspiciously close to darrsi and we'll have to pay him directly to get a bottle :lol

[richfzs]

Sounded good to me, dudeness :thumbup

I'll buy a bottle of that elixir tho, sounds like good stuff :rollin

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[His Dudeness]

Sounded good to me, dudeness :thumbup

I'll buy a bottle of that elixir tho, sounds like good stuff :rollin

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You'll have to PM darrsi about it :lol

[red98]

ooooooooooo...i`ll have two bottles...one for the bike and one for me,swmbo will be over the moon  :rollin :rollin