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Extremely low idle at first, then fine once warm

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maxp
Renault 5 Driver



Joined: 04 Oct 2012
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PostPosted: 21:22 - 04 Jun 2013    Post subject: Extremely low idle at first, then fine once warm Reply with quote
Starting the bike, it will idle extremely low - about 650rpm, and sounds so lumpy, that it is about to stall at any second, however, after 10-15 minutes, after everything has warmed up a bit, the revs sit at about 1500rpm.

Also, applying any sort of choke during this period will cause the bike to stall.

Im far from a carburettor expert, but something in my gut makes me feel all of this isnt right.
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Turkish
Crazy Courier



Joined: 09 May 2012
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PostPosted: 21:29 - 04 Jun 2013    Post subject: Re: Extremely low idle at first, then fine once warm Reply with quote
maxp wrote:
Guess who bought a 14 year old bike with a lumpy idle, decided to take it to a main dealer for its full service (@ £60/ph), and just had their bill - £730 ouch. 

A: This prat. 


Dude.

Anyway. Choke should work. Idle jet blocked? Mixture issue?
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CBR125R RW6
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Stowelly
Traffic Copper



Joined: 25 Oct 2009
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PostPosted: 14:21 - 05 Jun 2013    Post subject: Reply with quote
I have the same problem on my SRAD coincidentally after having someone clean / balance the carbs for me, would also like to know what this is!
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maxp
Renault 5 Driver



Joined: 04 Oct 2012
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PostPosted: 17:31 - 05 Jun 2013    Post subject: Reply with quote
@Turkish - I did take it back to the shop, and they did have a look at it - whereas before it was totally f**ked (would not start, would stall when stopped at traffic lights etc) it is now far better, but the choke-cutout issue and seriously lumpy cold idle is still playing on my mind.

Stowelly wrote:
I have the same problem on my SRAD coincidentally after having someone clean / balance the carbs for me, would also like to know what this is!


I have a feeling the pilot screw has been set to run the idle too rich, but i still need to do a bit more research first.
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Turkish
Crazy Courier



Joined: 09 May 2012
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PostPosted: 19:15 - 05 Jun 2013    Post subject: Reply with quote
maxp wrote:
I have a feeling the pilot screw has been set to run the idle too rich, but i still need to do a bit more research first.


Possible.

According to this document the default setting for the pilot screw is 1 ⅝ turns out from lightly seated (I am presuming this datum as it is convention but not explicitly stated).

You have the 1999 ZXR400 L9 (UK) model?
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CBR125R RW6
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Stowelly
Traffic Copper



Joined: 25 Oct 2009
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PostPosted: 09:57 - 07 Jun 2013    Post subject: Reply with quote
maxp wrote:


Stowelly wrote:
I have the same problem on my SRAD coincidentally after having someone clean / balance the carbs for me, would also like to know what this is!


I have a feeling the pilot screw has been set to run the idle too rich, but i still need to do a bit more research first.


is this something im able to try to adjust myself quite easily without too much dismantling of the engine etc?
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maxp
Renault 5 Driver



Joined: 04 Oct 2012
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PostPosted: 18:12 - 07 Jun 2013    Post subject: Reply with quote
Stowelly wrote:
maxp wrote:


Stowelly wrote:
I have the same problem on my SRAD coincidentally after having someone clean / balance the carbs for me, would also like to know what this is!


I have a feeling the pilot screw has been set to run the idle too rich, but i still need to do a bit more research first.


is this something im able to try to adjust myself quite easily without too much dismantling of the engine etc?


I cant speak for the SRAD in particular, but generally speaking access to the carbs requires the tank off, as they are located between the air filter and the intake portion of the engine.
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