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6E just won't run properly

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6E just won't run properly

Post  woodenhead on Tue Jul 24, 2018 6:39 pm

Hi
I've got a 6E which I cannot get running properly, it has Electronic ignition and I have double checked thr timing several times and it is spot on.
I have a S24 carb with the correct jets slide needle etc. When I kick it over after a few kicks it starts and run for about 10 seconds and then there is a massive backfire in the carb, I've tried adjusting the pilot screw all to no avail any suggestions?
Regards
Mike d.
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woodenhead

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6E trouble

Post  Bigjim on Tue Jul 24, 2018 6:50 pm

Is the float in the carb correctly set? My 9E suffered terribly until I checked and fixed the float height.
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Poor running

Post  kerabo on Wed Jul 25, 2018 6:34 am

Was it ok before you fitted the eletronic ignition?

The backfire suggests timing.

Check the float height as well.

My 8E was like that with massive backfire in the exhaust and on that the flywheel was moving on the taper..
If it's the Eletrex system when you do have it going ok a timing light will put it spot on and make the word of difference to the power.

Ken
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Re: 6E just won't run properly

Post  woodenhead on Wed Jul 25, 2018 10:43 am

I fitted the electrix unit after e re-bore and crank rebuild so haven't really has it running before. Set the timing to TDC with the head off and using a Dial Indicater so should be spot on.
Doe's anybody know the height of the float I'm sure I've seen it somewhere but cant find it again.
Regards
Mike d.
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woodenhead

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Timing

Post  piston 197 on Wed Jul 25, 2018 11:16 am

Is the timing set to TDC ??? would have thought it was Before TDC ( BTDC) as a spark at TDC would be very retarded ? and worse so as the automatic Electronic ignition advanced with revs ??
JH
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Poor running

Post  kerabo on Wed Jul 25, 2018 3:53 pm

On the bikes I had the float was a fraction under 1/4. 15/64" but someone will tell you exact.

You have the fitting sheet for the eletrex? I have fitted 4 but can't remember the setting without looking.

Ken
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Poor running

Post  kerabo on Wed Jul 25, 2018 4:14 pm

I just had to have a look.
Yes the T mark at TDC but see the other way that may be more accurate as TDC always seem the have a few deg of uncertainty

To check the timing use a strobe light, the ‘FA’ mark on the flywheel will align with the timing line (not line B) on the stator at
maximum advance position at approx. 3000rpm.
You can also accurately set the timing with the ‘FA’ mark. Example: set piston with a dial guage to 230 BTDC (4.36mm). Move
plate so timing mark is in alignment with ‘FA’ mark on the flywheel. *Note: Check actual full advance figure for your engine.
Are you running with the outer flywheel on? Without that they are very erratic.

Ken
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Timing

Post  piston 197 on Wed Jul 25, 2018 4:19 pm

Yes as i said BTDC ! 4.36mm before TDC as Ken says makes sense and the timing will advance with revs, if timed at TDC it will be very retarded, will backfire and possibly start running backwards .
JH
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Re: 6E just won't run properly

Post  woodenhead on Wed Jul 25, 2018 6:59 pm

With the Electrix system there are 2 ways of setting it
1. Set the piston to TDC and aline the T mark on the flywheel with themark on the casing.
2. Set piston at 4.36 mm before TDC and align the FA (full advance) line with he line on the plate.
I don't have a strobe so I used the TDC option instead.

Has anybody any idea of the flat height?
Regards
Mike d.
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Timing

Post  kerabo on Wed Jul 25, 2018 7:14 pm

The reason I say a strobe is on my 9E converted 250 it made the world of difference. It went like a rocket after timing that way. The only thing is you need a strobe that does a single cylinder.

What do you mean flat height? You mean float ?
Answered that a few questions ago.

Ken
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Timing

Post  piston 197 on Wed Jul 25, 2018 7:29 pm

Static timing with the Villiers flywheel set up is 5/32" BTDC whiuch equates to 3.9mm so a Full advanced figure of 4.32mm is not to dissimilar to the FA figure, only 20 thou different so the FA figure sounds about right ?
JH
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Re: 6E just won't run properly

Post  woodenhead on Thu Jul 26, 2018 6:57 pm

I have know checked the timing which I had set to TDC as per the instructions and found it had moved slightly. There was also a pickup on the taper so I lapped that in and checking with engineers blue it looks very good.
Tommorow I will set it at the fully advanced position.
I also checked the float height and it was onlu 3/16" so will adjust that and try again.
Regards
Mike d.
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Timing

Post  kerabo on Fri Jul 27, 2018 5:56 pm

I suspect that you had it timed correctly but as you noticed it's moving on the taper.
My own 8E was just the same with violent explosions from both the exhaust and carb. It had moved.
Lapped it in with grinding paste and it was fine.

Ken
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6e wont run properly

Post  david swerdlow on Fri Jul 27, 2018 6:48 pm

Just aside , I also have a 6e engine but not sure about the carb , should it be an s24 ? mine has a control lever on the handle bar that has on it - high and weak to be altered when running apparently or have these been replaced with the s25 carb , thanks david ...

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carb

Post  piston 197 on Fri Jul 27, 2018 6:50 pm

Yes S24 brass bodied carb on a 6E with weak/rich lever on the bars to raise lower needle ( choke)
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Re: 6E just won't run properly

Post  david swerdlow on Fri Jul 27, 2018 7:08 pm

Thanks for that .

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Re: 6E just won't run properly

Post  woodenhead on Mon Aug 06, 2018 6:32 pm

Hi
Timed it to the FA position instead of the T position started first kick and runs well did a few miles yesterday seems fine.
Regards
Mike d.
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Re: 6E just won't run properly

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