Linkert pops back

Linkert related issues
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108
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Linkert pops back

#1

Post by 108 » Mon Jul 05, 2010 1:49 am

Calling Cotton or anyone who has a good clue, My '48FL with a M35TP, ( Cotton float set a little higher than 1/4", ventury swadged last year, pressure tested manifold, high needle at 1 1/4 turn, hot idle rpm about 850, starts one kick every time-hot or cold) works just great except for one detail. After a long slowdown up to a stop, throttle closed to idle all the way, wait for the green light, and then the first crack of the throttle to take off and it pops back through the carb. It will do this about 6 times out of ten. BUT!!, if you blip the throttle 2 or 3 times while down shifting up to the stop ,it wont do it!! I'm gathering info and deciding what coul be the cause and what do. Thanks for any advise guys



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Re: Linkert pops back

#2

Post by steve_wood » Mon Jul 05, 2010 2:09 am

Did you try increasing the richness at idle?

108
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Re: Linkert pops back

#3

Post by 108 » Mon Jul 05, 2010 3:19 am

Yes I have, as much as 4-5 clicks, it just slows down the idle and still pops---but, maybe I'll try it again and then raise the idle speed back to were it was. I have it set where it is because I do a lot of idleing at four way stops, etc. and the plugs stay cleaner ......hmmm

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Re: Linkert pops back

#4

Post by steve_wood » Mon Jul 05, 2010 11:43 am

What kind of air cleaner do you have? Is it a modern one or the old mesh style?

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Re: Linkert pops back

#5

Post by Cotten » Mon Jul 05, 2010 5:21 pm

108!

My DURABLE floats are intended to be set at book spec: 1/4" with a ruler is fine.

Let us know if it helps.

....Cotten

108
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Re: Linkert pops back

#6

Post by 108 » Tue Jul 06, 2010 12:21 am

Steve Wood, I'm running a 4" paper filter behind an outter screen. .Have been for 10 years and replace it every spring

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Re: Linkert pops back

#7

Post by steve_wood » Tue Jul 06, 2010 11:52 am

Is there any play in the shaft for the throttle disk?

108
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Re: Linkert pops back

#8

Post by 108 » Tue Jul 06, 2010 10:30 pm

Steve Wood, the throttle shaft moves a tiny bit side to side at the top, and about 1/16" up and down. Another factor I forgot to mention is, my crankcase vent goes in the top left of the oil tank, exits the top right of the tank and goes in the back of the air cleaner, into a tube that curves around pointing right at the choke valve. This works very well but I may be dealing with some contamination of the intake air--but its been this way for years, and it just developed the pop this summer....I wonder if there's some oil crust build up inside blocking something..? I'll check that tonight

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Re: Linkert pops back

#9

Post by john HD » Tue Jul 06, 2010 10:31 pm

are you running straight gas or an ethanol blend?

as for the filter, if you have an oem copper mesh unit try that and see if the popping goes away.

john

108
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Re: Linkert pops back

#10

Post by 108 » Wed Jul 07, 2010 3:20 am

John, All the gas around here is "enriched" with 10% ethanol

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Re: Linkert pops back

#11

Post by panheadron » Sun Sep 01, 2013 1:07 am

Do you have lower compression in one cylinder? Is a pushrod too tight? If you have a slightly burnt valve, it can do the same. How clean are the plugs? Bad spark wire slightly grounding out along the way? One side of the coil weak?

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Re: Linkert pops back

#12

Post by Panacea » Sun Sep 01, 2013 3:57 am

panheadron wrote:Do you have lower compression in one cylinder? Is a pushrod too tight? If you have a slightly burnt valve, it can do the same. How clean are the plugs? Bad spark wire slightly grounding out along the way? One side of the coil weak?
It's been over three years Ron, I'll bet he got 'er fixed by now....

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Re: Linkert pops back

#13

Post by jdpan » Sun Sep 01, 2013 8:11 am

Sounds like an intake leak..

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Re: Linkert pops back

#14

Post by 58flh » Sun Sep 01, 2013 2:33 pm

LIKE JD SAYS!--VACUUM-LEAK!---If the shaft is that loose UP & DOWN,ITS getting fresh air sucked into it!,Try the correct FLOAT setting & see what happens!---Also you can raise the RPMs & using a spray bottle with water & a little soap in it just so it will stay for a few seconds before it dries-up!,& spray those shafts HEAVILY!--IF RPM DROPS,Theres your culprit.Personaly I would do a complete leak-test!--& while your at it ,Check your leak-down on comp.-stroke for both cyls.That will rule out a burnt valve!---Respecfully---RICHIE

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