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Suzuki 800 Intruder Club & Forum

A UK Site Dedicated To The Suzuki C800, VL800, VX800, M800, VZ800, VS800, C50, M50 Model Intruder / Boulevard / Marauder
 
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 Low revs fuelling problem

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Llaw1969
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PostSubject: Low revs fuelling problem   Sun Sep 27, 2015 7:27 pm

Hi, hope you guys can help me out?.....

Just had a major engine rebuild and finished running her her in.
Mechanically, very happy with it, engine is sweet.

However, I seem to have a low speed, low revs fuelling problem.
Out on the open road in taller gears she pulls lovely...but when I get into town traffic she splutters and cuts out, I have to keep the revs up and slip the clutch.
Trouble is I don't know anything about fuel injection, any ideas?.......
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simbo
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PostSubject: Re: Low revs fuelling problem   Sun Sep 27, 2015 8:22 pm

Try running some Redex through it first Mike, see how it is after a couple of tanks run through the system to clean things up?
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Llaw1969
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PostSubject: Re: Low revs fuelling problem   Sun Sep 27, 2015 8:38 pm

Oh OK, is that injector cleaner or what?.....
Come to think of it, the parts will have been sitting around in a workshop for 3 months, I would have hoped that everything was kept clean! But maybe not....

I will try that before I start poking around. Thanx.
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simbo
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PostSubject: Re: Low revs fuelling problem   Sun Sep 27, 2015 8:49 pm

Yeah fuel system cleaner, let us know how you go on 
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hawktheslayer
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PostSubject: Re: Low revs fuelling problem   Mon Sep 28, 2015 3:28 pm

Idle adjust! don't know if it has one but if its a couple of hundred revs too low it would cause the same thing
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Llaw1969
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PostSubject: Re: Low revs fuelling problem   Mon Sep 28, 2015 8:01 pm

Hey Simbo, problem solved!  

Put a dose of redex in half a tank of fuel and and went for a 20 mile blast over the mountains...pulled into a sideroad to try some low rev moves...she's running perfect! So I backed off the idling to where it should be...sweet!

So as she's now run in, methinx back over the mountains and I'll open her up....WOW!! She flies!!!
She's NEVER run as smooth as this in the 3 years I've had her...well chuffed!!!
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captain crash
Mentally Deficient lunatic ..... & ..... Site Moderator
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PostSubject: Re: Low revs fuelling problem   Mon Sep 28, 2015 8:08 pm

Redex is gods gift to bikers, praise the lord   . . . . . . . 
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Llaw1969
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PostSubject: Re: Low revs fuelling problem   Mon Sep 28, 2015 8:25 pm

I'm so impressed I've dosed the car too! Happy days
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katsd
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PostSubject: Re: Low revs fuelling problem   Mon Sep 28, 2015 8:48 pm

Mind if I hi-jack this thread Mike ?  Sure I've read somewhere that setting your revs too low can cause problems - is this right or have I made that one up ?  And how do you set your idle if you don;t have a rev counter ?
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simbo
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PostSubject: Re: Low revs fuelling problem   Mon Sep 28, 2015 9:04 pm

Good to hear Mike, just run a couple of tanks through with redex to clear everything up    Running the bike with too low an idle starves the top end of oil when left on tick over Dave, might sound good but it's not doing the engine any favours over time.
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katsd
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PostSubject: Re: Low revs fuelling problem   Mon Sep 28, 2015 9:40 pm

Cheers Sim - so what's the best way to check the revs ?
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simbo
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PostSubject: Re: Low revs fuelling problem   Mon Sep 28, 2015 10:12 pm

One of these link or possibly connect a multimeter to the HT lead with a crocodile clip temporarily?(Andrew could be your man in that dep't lol) by sound, it should be set when warm with no stumbling or stuttering to give a smooth steady idle, once it starts to sound uneven? turn it up a bit till it's smooth and steady.
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Llaw1969
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PostSubject: Re: Low revs fuelling problem   Sun Oct 04, 2015 3:12 pm

Hmmmmmm....I've run a couple of tankfuls through now, filled up as normal, same problem....cutting out on warm start up and spluttering at junctions on low revs.
Also, took the air filter off to discover its blowing a little engine oil back through the air filter. Not looking good. 
The fact that it only runs smooth when dosed with redex....am I right in thinking she is running lean or not? And how do you test/adjust the mixture on a fuel injected bike?.....
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simbo
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PostSubject: Re: Low revs fuelling problem   Wed Oct 07, 2015 8:34 pm

How's the oil level Mike? it could be slightly over filled and that's why there's some blowing in the air box through the breather? it's not un normal to get a small amount in there which usually gets recycled through the intake and burnt away, if the level is fine? it could be worth doing a compression test to see if your getting a pressure build up in the crank case from worn rings? as for running lean? what mods ie exhaust and air filter are you running on the bike? as for testing for running lean? you'd have to do a plug chop to check the colour of your plugs to determine if it's running rich or lean?  there is no way of adjusting the mixture without a fuel processor on fuel injected bikes, Redex won't richen the mixture it's just a cleaner to keep the injectors and fuel system in top condition, you mention having the engine rebuilt, what did you have done?
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katsd
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PostSubject: Re: Low revs fuelling problem   Wed Oct 07, 2015 9:01 pm

Mike - I've just run mine through a Dyno Tester - if you can get to one, it's well worth the money
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