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Fuel Fuel Delivery


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June 13th, 2017, 12:45 PM   #21
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I Ride: Husaberg FE600 1994, Yamaha FZS1000, Beta Tr33
I don't have the cam/spring auto decomp. My bike has the kickstart lever cable actuated decomp. It's fairly easy to kick around with the decomp adjusted as per manual (3 mm play at tdc, lobes down).

With the cd1 jet installed it pops on deceleration. Flames out of the exhaust.

I can turn of the choke more or less immediately (like 10 seconds or so) after starting it cold.

It runs when hot, everything OK, it pulls great, lots of power. But when I turn it off, I can't restart it. Wait an hour or so until it's completly cold and then I can restart it with the choke.

Away for work now until friday. I'll check ignition with a strobe light and ohm-measure the stator.

Last edited by Khristi; June 13th, 2017 at 12:50 PM.
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June 13th, 2017, 11:40 PM   #22
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OK let's get two things going right here.

you need to be sure that you have a spark under pressure in the combustion chamber. the best you can do i suggest is a strobe for ignition timing on the HT lead. plug caps can break down so perhaps a new plug cap BUT, like you, I believe it is carb related.

basically, your bike is running rich and needs little choke.

try and keep the same idle but turn the idle in until either the idle starts to fall OR when riding you have a poor response.

how many turns out is this? i bet it is just about 1-1.25 turns out from closed?

what size were the jets and the clip position in the carb?

I guess if i look back to the beginniing it will say the year, model and CC right?

Taffy
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June 14th, 2017, 07:37 AM   #23
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I Ride: Husaberg FE600 1994, Yamaha FZS1000, Beta Tr33
FE600 1994. Roundslide 38 mm dellorto.

Again: Pilot is 52, needle K32, emulsion tube AB265, choke jet 45 and main jet 180, round slide no 50. Needle in pos 3 from counted from top.

Fuel screw 2 turns out has highest idle and smooth response. Idle screw one turn out for start, then back it out another turn after started for a more normal idle.
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June 14th, 2017, 08:06 AM   #24
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Hi

So obviously you have a pilot jet too big.

Your carb it's not the same as mine (600-9 and you have there some strange things, but for mine the std PJ is 40, and usually you go to smaller one.


ZAGA
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June 14th, 2017, 08:33 AM   #25
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I think my bike had pilot 38 original, I changed to 52 many years ago, were hard to start warm the first years but got better with other adjustments.
I think the biggest flaw with a really small pilot is that its extremly sensitive when it comes to dirt and it could stop the engine.
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June 14th, 2017, 09:21 AM   #26
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I Ride: Husaberg FE600 1994, Yamaha FZS1000, Beta Tr33
Zaga: why do you mean the pilot jet is obviously too big? Two turns out and a smooth idle and response (once it starts) sounds just about right I think. And it's standard jet according to the 89-96 parts manual.

I'll check the timing with a strobe, should be 33-34 deg advanced right? But wouldn't a slighly retarded timing make it easier to start even if it maked it more prone to pop/ping/flame and have a little less power?
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June 14th, 2017, 11:49 AM   #27
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Hi
I say too rich because you say you need to go to one turn out to start the bike.
Only after star you go to 2 out
If the bike is idling and you start to screw in the ps, how much can you go before the bike stops?

With the strobe, at idle speed, go to 6deg of advance
You can also check max advance
Watch out this CDI will jump very fast from idle to max advance, that is one of it's flaws.

Cheers
ZAGA


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June 14th, 2017, 01:42 PM   #28
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I Ride: Husaberg FE600 1994, Yamaha FZS1000, Beta Tr33
Ok. By idle screw, I meant the screw that sets the slide height stop position and thereby the idle speed. By fuel screw I meant the one on the pilot jet circuit. Maybe that's not the right words then. The screw on the pilot jet circuit I have two turns out all the time.
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June 15th, 2017, 02:25 AM   #29
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Hi

Sorry, I call it pilot screw or PS.

It is strange that your PJ is a 52, I would say it's too big anyway.

Again, try to screw in your PS, to see when the bike stops


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June 15th, 2017, 09:38 PM   #30
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I Ride: Husaberg FE 400 00, Husaberg Fe450 07, Husaberg FC 600 -99, Yamaha FJ1200 -86 Yamaha RD350 -84
https://www.ducatimeccanica.com/dell.../dellorto.html
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