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When is the engine warmed up enough

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nathandenniso...
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Joined: 02 May 2010
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PostPosted: 22:02 - 14 Feb 2011    Post subject: When is the engine warmed up enough Reply with quote
Recently had troubles with the motorbike, before in the colder days as soon as I could turn the throttle back on half choke I was ready to rock n roll, but now if I don't leave the bike to warm up (even if I can give it throttle on half choke) 100m's down the road it will only reach 30mph as it's not as powerful, as soon as I turn engine on and off and warm it up abit more or leave it 3 more mins on centre stand on half choke it doesn't have the problem, is it just a case of leaving it to warm up longer even if I can pull the throttle back on half choke, thanks
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Syris D Indomitable
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PostPosted: 22:20 - 14 Feb 2011    Post subject: Reply with quote
Sounds as though you have a respiration issue.
In cooler temps the air is thinner, maybe you need to adjust the carb settings or clean the air filter, and or even give the carburettor good clean especially the idle jet ECT.
Check the choke is working properly too.
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nathandenniso...
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PostPosted: 22:24 - 14 Feb 2011    Post subject: Reply with quote
Val Killmore wrote:
Sounds as though you have a respiration issue.
In cooler temps the air is thinner, maybe you need to adjust the carb settings or clean the air filter, and or even give the carburettor good clean especially the idle jet ECT.
Check the choke is working properly too.


The Carbs and main jet have been cleaned out last week and I'm guessing you can tell if choke is working due to the higher noise from the engine (which gets higher after half choke full choke etc)
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nathandenniso...
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PostPosted: 22:37 - 14 Feb 2011    Post subject: Reply with quote
Yamaha sr 125 2000
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Syris D Indomitable
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PostPosted: 22:41 - 14 Feb 2011    Post subject: Reply with quote
I always make sure the bike is warm enough to idle without any choke on.
Your performance will always be affected running/riding with the choke half on until the engine is warmed properly.
You will also notice a change in performance due to adverse air temperatures.
Ideally carbs need to be set up for this, however most people don't bother I guess.
I am guessing that you have only been able to gain a bit more performance whilst running the bike on half choke because of the very cold air temperatures we have experienced, this is because the air is significantly thinner.
Now we are back to normal air temps you won't get anywhere near the performance whilst pruning the bike on half choke. Spluttering at thirty on half choke is the choke telling you to switch me off.
Give air filter a check too.

Last edited by Syris D Indomitable on 22:42 - 14 Feb 2011; edited 1 time in total
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nathandenniso...
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PostPosted: 22:41 - 14 Feb 2011    Post subject: Reply with quote
rob yarrr wrote:
give it 5 mins to let the oil circulate round

then go steady for a mile and it should be ok

maybe try a fuel additive

Cheers, to be fair I have been going for it with it only being a 125, try and leave it for 5 tomorrow and then set off
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nathandenniso...
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PostPosted: 22:44 - 14 Feb 2011    Post subject: Reply with quote
Val Killmore wrote:
I always make sure the bike is warm enough to idle without any choke on.
Your performance will always be affected running/riding with the choke half on until the engine is warmed properly.
You will also notice a change in performance due to adverse air temperatures.
Ideally carbs need to be set up for this, however most people don't bother I guess.
I am guessing that you have only been able to gain a bit more performance whilst running the bike on half choke because of the very cold air temperatures we have experienced, this is because the air is significantly thinner.
Now we are back to normal air temps you won't get anywhere near the performance whilst pruning the bike on half choke. Spluttering at thirty on half choke is the choke telling you to switch me off.
Give air filter a check too.


Will give it a clean out on the weekend thanks
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flumpy7
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PostPosted: 22:50 - 14 Feb 2011    Post subject: Reply with quote
Val Killmore wrote:
Spluttering at thirty on half choke is the choke telling you to switch me off.
Give air filter a check too.


^^ This. I would think you need to reset your pilot and idle adjusters.
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cb1rocket
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PostPosted: 23:09 - 14 Feb 2011    Post subject: Reply with quote
I had an SR, very briefly and it always needed a good bloody warm up before it would let me have kind of power! I found that my choke doesn't stay out and it was really annoying.

Does the choke stay put on yours?
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nathandenniso...
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PostPosted: 23:10 - 14 Feb 2011    Post subject: Reply with quote
cb1rocket wrote:
I had an SR, very briefly and it always needed a good bloody warm up before it would let me have kind of power! I found that my choke doesn't stay out and it was really annoying.

Does the choke stay put on yours?


Yer it does, but from my experiences over time I seem to have learned it needs a good warm up otherwise it will splutter to 30 until you let it warm up
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fiery tupp
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PostPosted: 23:11 - 14 Feb 2011    Post subject: Reply with quote
If it's a standard Sr air box , you should have an oiled filter , these need cleaning (in a solvent ) & lightly re'oiling often .

Check condition of the plug , a new one for a couple of quid often works wonders too .
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nathandenniso...
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PostPosted: 23:15 - 14 Feb 2011    Post subject: Reply with quote
rusty sprocket wrote:
If it's a standard Sr air box , you should have an oiled filter , these need cleaning (in a solvent ) & lightly re'oiling often .

Check condition of the plug , a new one for a couple of quid often works wonders too .


WD40 okay for the re-oiling? (I've read it is)
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fiery tupp
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PostPosted: 23:27 - 14 Feb 2011    Post subject: Reply with quote
nathandennison wrote:
rusty sprocket wrote:
If it's a standard Sr air box , you should have an oiled filter , these need cleaning (in a solvent ) & lightly re'oiling often .

Check condition of the plug , a new one for a couple of quid often works wonders too .


WD40 okay for the re-oiling? (I've read it is)


Thumbs Down NO, clean engine oil , wd 40 is no good at all for that .
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kestrel
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PostPosted: 00:14 - 15 Feb 2011    Post subject: Reply with quote
Val Killmore wrote:

I am guessing that you have only been able to gain a bit more performance whilst running the bike on half choke because of the very cold air temperatures we have experienced, this is because the air is significantly thinner.


It's the other way round, cold air is more dense or 'thicker' than warm air. In cold ambient temperature more air is drawn into the carb resulting in a lean mixture, as the air temperature increases it becomes 'thinner', less air is drawn in resulting in a richer mixture. Using the choke to start a cold engine reduces the amount of air and richens the mixture to aid starting.
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The Artist
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PostPosted: 00:28 - 15 Feb 2011    Post subject: Reply with quote
^^^ was about to post that.

Most engines rub better in cool air than hot air. Check air filter etc
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weasley
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PostPosted: 07:32 - 15 Feb 2011    Post subject: Reply with quote
Yes, cold air is "thicker", but carbs are effectively mass flow metering devices so they automatically compensate for air density changes (within a range) and will keep the mixture right. This is why engines run better on cold air; cold air = dense air = more oxygen; carb adds more fuel = bigger charge = more power.

To the OP, you should back the choke off as quickly as possible whilst still allowing it to run. Don't ride it until the choke is off completely. I start my bike on full choke then immediately put it in a bit, then let the engine idle as I put my helmet on, putting the choke in a little bit every so often until it will idle and rev cleanly on no choke. Usually no more than 2 minutes.
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Syris D Indomitable
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PostPosted: 07:38 - 15 Feb 2011    Post subject: Reply with quote
Sorry, that's what I meant, thicker or denser in colder temps.
The bike runs better on half choke.
Now the air is normal it's back to the usual choke procedures.
Got it mixed up.
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nathandenniso...
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PostPosted: 08:53 - 15 Feb 2011    Post subject: Reply with quote
Let the bike start this morning whilst I got all my textiles, helmet gloves on etc and ran alot smoother no problems at all, turned choke off asap9thanks for the tips!) Give the Air filter a clean out at weekend , to the OP about WD40, I have a unused 1litre of Castrol 10w40 semi synthetic Oil, guessing that's ok?
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fiery tupp
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PostPosted: 15:07 - 15 Feb 2011    Post subject: Reply with quote
nathandennison wrote:
Let the bike start this morning whilst I got all my textiles, helmet gloves on etc and ran alot smoother no problems at all, turned choke off asap9thanks for the tips!) Give the Air filter a clean out at weekend , to the OP about WD40, I have a unused 1litre of Castrol 10w40 semi synthetic Oil, guessing that's ok?


Yes & sqeeze the filter out so it's just damp with oil not dripping, also get a manual,
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nathandenniso...
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PostPosted: 15:17 - 15 Feb 2011    Post subject: Reply with quote
rusty sprocket wrote:
nathandennison wrote:
Let the bike start this morning whilst I got all my textiles, helmet gloves on etc and ran alot smoother no problems at all, turned choke off asap9thanks for the tips!) Give the Air filter a clean out at weekend , to the OP about WD40, I have a unused 1litre of Castrol 10w40 semi synthetic Oil, guessing that's ok?


Yes & sqeeze the filter out so it's just damp with oil not dripping, also get a manual,


I have two Embarassed
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fiery tupp
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PostPosted: 15:22 - 15 Feb 2011    Post subject: Reply with quote
I have two Embarassed

Well try reading them Rolling Eyes
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nathandenniso...
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PostPosted: 16:36 - 15 Feb 2011    Post subject: Reply with quote
rusty sprocket wrote:
I have two Embarassed

Well try reading them Rolling Eyes


Sorry for asking for help your majesty
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