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Post subject: wont go to the red line
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steve250lc  Find me a Road! Joined: 24 Oct 2007 Total posts: 18 Location: Southampton |
Right further to my loss of power thread after reading other threads on similar subject I took my totally standard (jets pipes carbs the lot) RD250LC out and tried to red line it in at least one gear and couldnt.
It gets to around 7500 8000 and then just kind of splutters or fails
If I then hold the throtal right open to max the revs drop off back down to 6000 which is real fun when you are overtaking a lorry !
I recon this is the carbs running out of petrol because the floats are set wrong but what do you lot think ??
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Posted: Thu May 08, 2008 11:29 am
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Billy All-gear Wheelie! Joined: 12 Oct 2007 Total posts: 1915 Location: Sweden arise! |
I think it might need fine adjustments to run all the way, but it might ufcourse be something else.
I have thought about carbs running out of gas aswell but it seems a bit impossible, they don't drink that much petrol do they?
Btw.
I tried lowering the needles one notch and it made a HUGE difference in acceleration!
Maybe you shall try that?
Edit: Or raise the needle, i dunno if it's rich or lean..
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Posted: Thu May 08, 2008 9:14 pm
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Post subject: wont go to red line
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steve250lcFind me a Road! Joined: 24 Oct 2007 Total posts: 18 Location: Southampton |
Think you may be in the right area with needles.
When I get to the stop point if I throttle off and on I can jink it up to around 9-9500.
Apparently the last 1/4 of the twist on throttle is all jet so the fuel just
sprays up and back every thing else is off at this point. Bike originally had 350 jets because it was fitted with all speeds so may be the needles were adjusted as well. Took reed blocks out for a look and they are fine. Air filter is clean in a standard box not full of holes and I dont want to go down the modification route
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Posted: Fri May 09, 2008 7:08 am
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Post subject: Re: wont go to red line
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Trig One-handed Stoppie! Joined: 04 Aug 2003 Total posts: 2376 Location: On Cloud 9 |
| steve250lc wrote: |
Think you may be in the right area with needles.
When I get to the stop point if I throttle off and on I can jink it up to around 9-9500.
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That'll be too rich then. 
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Posted: Fri May 09, 2008 8:06 am
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Post subject: running rich
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steve250lcFind me a Road! Joined: 24 Oct 2007 Total posts: 18 Location: Southampton |
The plugs are pointing towards this but how do you lean it up ?
The Haynes book of lies says that all the symptoms point towards a break down in the ignition system like leads or coil !
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Posted: Fri May 09, 2008 7:22 pm
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marinocaliterna Suburban Commuter Joined: 03 Mar 2007 Total posts: 87 Location: Italy |
Hi there, had a similar problem and for me it turned out the bike was fuel starved at high speed. I found fuel blockages in different places: 1) the stock paper filter in the cockpet bowl collects debris and rust from the tank very quickly and doesn't let fuel out quickly enough. I removed it and put a metal inline filter from Norbo. 2) my carbs have powerjets and the outer hoses connecting the bowl with carb body were not perfectly clean 3) adjust float levels to Haynes specs, measuring WITHOUT the carb gasket.
Once you have checked these you can be sure that fuel is getting there at the rate required. You can then proceed to check the other more subtle possible causes.
Cheers,
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Posted: Fri May 09, 2008 8:08 pm
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whitelc Daily Burner Joined: 16 Aug 2003 Total posts: 146 Location: Jyväskylä, Finland |
dirty air filter?
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Posted: Sat May 10, 2008 4:24 am
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Post subject: wont go to red line
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steve250lcFind me a Road! Joined: 24 Oct 2007 Total posts: 18 Location: Southampton |
Air filter out new plugs new caps now looking at coil.
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Posted: Sun May 11, 2008 9:40 am
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| Rich |
I hope I'm not stating the obvious here but if the bike's standard, would it not be a good starting point to put ALL the carb settings - jets, needle height etc back to standard settings first?
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Posted: Sun May 11, 2008 11:20 am
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