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four stroking - '74 DT360A

25 Oct 2020 14:24
msavitt
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four stroking - '74 DT360A #1
nearing perfection with my never ending project!
want to increase pilot jet one size...stock per manual is #50
does anyone know the numbering scheme? e.g. next size up is 60? richer?
thanks

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25 Oct 2020 15:09
RT325
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four stroking - '74 DT360A #2
#60 is richer than 50. But i see your heading is 4 stroking, which indicates richness. I'm guessing it's 4 stroking when cruising on the needle. Little bit more info please. Idle mixture is adjustable on the screw of course, which i'm sure you know. How does i perform on wide open throttle, does it rev right out clean.

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25 Oct 2020 16:13
MarkT
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four stroking - '74 DT360A #3
First thing I'd check if truly four stroking is the o ring seal to float bowl.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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25 Oct 2020 16:28 25 Oct 2020 16:30 by Bigdog302.
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four stroking - '74 DT360A #4
yep, the jet setter o-ring can cause running very rich problems under medium to heavy throttle if it does not seal.

2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A 1974DT250A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
Dave
Jesus is Lord!

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25 Oct 2020 18:08
msavitt
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four stroking - '74 DT360A #5
thanks for the advice and info, sounds like you guys think i am on the rich side under that no-accel position
carb rebuilt and needle in middle per spec and new oring around main jet
screw the manual, I will lean the needle one groove and take a spin tomorrow and update
if i can lick this one condition, then this beast will be awesome

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26 Oct 2020 02:27
RT325
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four stroking - '74 DT360A #6
Just one more comment. Don't lean it off more than required on the needle. But sounds like you're more than safe to go one clip leaner. Is the pilot screw set about right--1.5 approx. I've seen them screwed right home which mucks things up closing throttle & bringing it on again. Reading above again 'screw the manual' i guess is pilot screw set to 1.5 turns. Cheers.

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26 Oct 2020 14:30
msavitt
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four stroking - '74 DT360A #7
So I took a little work from home break and dropped the needle one groove and while not completely eliminated, this definitely improved the ridability by greatly reducing the surging at that "zero acceleration" speed!

I also adjusted the idle air bleed a bit - just a tad bit lean of rich "ba ba ba" if you get my drift :-)
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