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Fuel Fuel Delivery


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June 16th, 2017, 03:21 AM   #31
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I Ride: Husaberg FE600 1994, Yamaha FZS1000, Beta Tr33
Thanks for that link Jampe. I have some reading to do this weekend.

Latest status:

1. Checked the stator DC resistance values. 1690 ohm cold red/black and 21 ohm cold green/black. 1860 / 23 ohm hot. This is well within 10% tolerance.

2. Spark test shows I can get a blue nice spart for at least 10 mm distance hot and cold.

3. Ether based starting gas used for testing for air leaks at intake boot, fuel screw, idle screw, slide top cover. No leak.

4. With fuel screw (Pilot jet screw) out about 1,5-2 turns I have the smoothest idle. Engine still runs at about 0,5 turns out but beyond this it stalls.

5. Strobed the timing. Have 33 degrees advance at high idle/throttle and it drops to about 6-7 degrees at low idle. The difference is very noticable.

6. Starts fairly easy when cold (usually not more than 10 kicks or so) using the choke and idle raised to one turn out from bottom. PS at -1,5 to -2 turns. I don't even have to kick it that hard. Just a nice smooth kick thru the whole motion starting at "lobes up".

7. Impossible to start hot. Can get it to just ignite a pop or two but then nothing. Let it cool and it starts again, with choke.

8. Needle position in second from top but this shouldnt have much to do with the starting abilities, right?
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June 16th, 2017, 05:18 AM   #32
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I Ride: Husaberg FE 400 00, Husaberg Fe450 07, Husaberg FC 600 -99, Yamaha FJ1200 -86 Yamaha RD350 -84
Smaller pilot jet is still my advice.
Try this... Hold in the kill button, open throttle and do 3-4 full kick and then release kill button,throttle and try to start it again.
That worked fine for my 501 when it stalled before i changed the pilot jet.
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Jampe
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June 16th, 2017, 11:13 AM   #33
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Ok, so which values do I try? 45? 40? Have 52 now.
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June 16th, 2017, 10:22 PM   #34
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I have 32 in my 501 and 400, try 40
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June 17th, 2017, 04:18 AM   #35
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Yes I would start with 40



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June 17th, 2017, 08:00 AM   #36
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A theory of mine is that the mixture becomes richer on a bike when its hot.
Cold air has more oxygen than warm.
When you kick a warm engine the engine-rotation goes so slow that the air that goes into the engine warms up so the amount of oxigen decreases therefore, I think, many have problems to start warm bikes.
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June 17th, 2017, 09:19 AM   #37
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That is why you have the choke, as the engine gets warmer the less oxygen you have
And 4 strokers runs very hot
Also the hot star was invented for a reason
A hot start is no more than fresh air directly in to your intake


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June 18th, 2017, 11:39 PM   #38
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about a 42 I would think. but something isn't right because stalling with less than 0.5 of a turn indicates that the PJ is fine!

so the problem could be elsewhere. not a problem a such but something that isn't spot on.

on a dell orto it is a fuel screw, on a keihin it is a pilot screw.

regards

Taffy
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June 19th, 2017, 12:59 PM   #39
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I Ride: Husaberg FE600 1994, Yamaha FZS1000, Beta Tr33
I've ordered some pilot jets - 40, 46 and 58. Together with my current 52 that should cover the whole possible range for a 600 with the PHM38 don't you think. I also ordered som choke jets - 40 an 50 which together with my current 45 also should cover most of the range? Ordered new gaskets and o-rings although I didn't identify any leaks with the starting fluid.

Tried another method, took off the side mounted air filter and blew som cold air in with the compressor (evacuating the hot air from the crank vent). Could actually get it to start once hot (no choke) though it took some kicking.

Lets see what above combinations can give.
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July 9th, 2017, 03:18 AM   #40
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I took the bike for a ride in the woods today, 20degrees, cloudfree, much deforestation overall good speed, clean airfilters but the idle was weak, so close to stalling several times but made it without.
In the end of the run I turned the fuelscrew(must be an airscrew) in a bit and it almost stalled, I screwed it out 2and a half turn and the idle was back to normal again.
Someone here said it was a fuelscrew, in other words the screw in that case would add fuel when I screw it out and the result would be a lower rpm on idle.
But this could not be the case, it has to be an airscrew because adding air to the mixture will result in a higher rpm.
Husaberg 600fe 1995 with dellorto

Last edited by Mazzokie; July 9th, 2017 at 03:22 AM. Reason: misspelling
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