Dillinger1977
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| posted on 28/4/07 at 10:21 AM |
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R1 hydrocarbon level
Just had the car down to the local MOT garage on the estate to get its emissions tested.
Its a 2000 carbed yamaha R1 with a cat exhaust fitted.
From the readings, the CO level was okay (very slightly over- 0.5 i think, though the fella said theres a tolerance for error so was within that)
however the HC reading was way off. supposed to be <=200 but mine was hovering around 500.
The car currently has a cat exhaust fitted. it wasnt -red- hot though. (It idled for 10 minutes before i left but the garage is only about 500
metres away)
not knowing a great deal about engines, can anyone advise to what the problem might be and maybe how to fix it before I have to SVA it? 
thanks!
-Rog
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smart51
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| posted on 28/4/07 at 11:29 AM |
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HC too High and CO too high? You're running a bit rich. Turn the idle mixture screws on each carb clockwise ab 1/4 and try again, then another
1/4 turn... Keep an eye on lambda though. 0.97 to 1.04.
Failing that, you need a stronger cat. Try the mixture screws though.
Also, make sure the mixture screws are turned out by the same amount.
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smart51
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| posted on 28/4/07 at 11:42 AM |
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Are you only just getting your car on the road now Roger? wasn't your kit delivered the week before mine? Ive driven mine, broken it, fixed
it, driven it, broken it, replaced the engine, driven it, broken it, fixed it, broken it again and building a good engine out of two bad ones in all
that time
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Dillinger1977
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| posted on 28/4/07 at 01:17 PM |
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pfft. tell me about it...
cant wait till the damned thing is on the road! (even though its just going to be more grief once it is!)
i'll try backing the mixture screws out a bit.
ive just had the spark plugs out and every one is a bit sooty but dry so I guess running rich might be the one.
Is it worth new plugs at this point or just brush em and put them back?
One other thing, Occasionally when starting from cold theres a cough from one of the cylinders and i see some sort of vapour fire back out of the air
filter. Is that a misfire?
-Rog
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smart51
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| posted on 28/4/07 at 01:25 PM |
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If its rich, you want to turn the screws in, I think, not back them out. You'll soon see if you're turning them the wrong way.
I'd have thought that cleaning off the plugs would be fine as they're fairly new and unused.
I don't know about misfires, sorry.
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Dillinger1977
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| posted on 28/4/07 at 07:00 PM |
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so heres my theory so far. please anyone correct me if i'm wrong!
1) mixture screws on the carbs were presumably too rich
2) this caused the plugs to go sooty..
3) which has an impact on the ignition
4) which probably causes misfires
5) which dumps unburned fuel into the exhaust, causing the very high HC readings on the emissions test.
does this sound plausable?
-Rog
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