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Old 12-06-2015, 03:37 PM   #1
Hemroid
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Default Triumph Joe Hunt Mag Problems

Just about had it with these Mags. This is my second one and to be honest im not sure why i attempted this again..

My first one on an old T100 gave me the usual taper drive slippage leaving me at the road side many times and then eventually snapped off inside the cam and the engine had to come apart.

Just got a brand new mag for my new T100R 5000 motor and im having issues again. Easy to time with these late motors as the crank has the TDC and the BTDC notch through the inspection hole with the special tool. The first time i timed it it started first kick and ran absolutely great, i couldn't believe it but then suddenly it wouldnt start. I thought the drive had slipped again like my old one and it might have im not sure so i cut the bolt down abit more and added some loc tight retainer. Its not slipping now but the bike just will not start still.

I have a good spark, petrol, timing spot on, i just cant figure out why it wont start? It does splutter and attempt to start when you tickle the carbs but it doesnt run.

Anyone have any ideas? Thanks Steve
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Old 12-06-2015, 03:52 PM   #2
magnum45pete
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Default Re: Triumph Joe Hunt Mag Problems

very little can go wrong with a FM type Mag and a Hunt is a FM type magneto,... condensor, points gap, shorting out or timing out..... don't ever put any loctite on the taper...all Morse Tapers are designd to go together DRY !!! .... if its spluttering it sounds like timing or condensor ...if it wasnt sparking it wouldnt even do that,
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Old 12-06-2015, 03:59 PM   #3
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Default Re: Triumph Joe Hunt Mag Problems

Might be a silly question, but have you tried with new spark plugs?

Sometimes, if the mixture has been too rich on my bike, nothing but replace the plugs helps. (Champion N4C)
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Old 12-06-2015, 05:02 PM   #4
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Default Re: Triumph Joe Hunt Mag Problems

i think i better try and remove the taper drive and clean the loctight off, cant afford to damage the cam on this engine. i found only half the taper if that is actually making contact with the taper on the cam and cranking the bolt up any tighter might shear it which would increase my chances of headbutting my workshop wall!
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Old 12-06-2015, 05:40 PM   #5
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Default Re: Triumph Joe Hunt Mag Problems

I am not familiar at all with triumphs, but can you lap the tapers together to get full contact?
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Old 12-06-2015, 05:53 PM   #6
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Default Re: Triumph Joe Hunt Mag Problems

I did try this but i dont think it really did much good..
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Old 12-07-2015, 06:11 AM   #7
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Default Re: Triumph Joe Hunt Mag Problems

I lapped the tapers of my Lucas mag and the auto advance and it made locking the timing a breeze. To me, it is the only solution to less than full contact.
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Old 12-07-2015, 09:33 AM   #8
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Default Re: Triumph Joe Hunt Mag Problems

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I did try this but i dont think it really did much good..
What technique did you use? I use a fine grade of Clover valve grinding compound. The contact areas will show a dull gray surface finish after cleaning. Get a 100% surface contact between the parts, clean both with an oil free solvent such as acetone, and assemble dry.

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Old 12-07-2015, 11:19 AM   #9
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Default Re: Triumph Joe Hunt Mag Problems

Maybe i didnt lap it well enough. I used some fine paste, smeared it on the taper drive and swivelled it by hand back and forth. But as i say only half the drive is actually sinking into the end of the cam so it would take months of lapping to get through that much material surely.
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Old 12-07-2015, 05:01 PM   #10
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Default Re: Triumph Joe Hunt Mag Problems

Spent the 3rd night on this and still no joy!

I removed the taper and all loctight and started from scratch. Im definitely timing it correctly and as i said earlier the first time i installed this it ran perfect.

God knows whats changed, i dont.
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Old 12-07-2015, 05:10 PM   #11
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Default Re: Triumph Joe Hunt Mag Problems

'if you think its electric it usually turns out to be fuelling problem' and vice versa , that's what I've learnt on JJ . I'd suggest you check carb for blocked pilot jet.
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Old 12-07-2015, 05:42 PM   #12
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Default Re: Triumph Joe Hunt Mag Problems

Checking the jets is a very good idea!! Tomorrow night i will just that..

When i tickle the carbs it does take a second or 2 for petrol to drip, is that not telling me the petrol is leaving the jets as im kicking it over? i check..

Also i dropped a small net containing them lead replacement balls right in the tank, didnt mean to but thought oh well, perhaps they are not needed and have ruined the petrol?
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Old 12-07-2015, 06:34 PM   #13
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Default Re: Triumph Joe Hunt Mag Problems

You can check the timing by pointing a strobe gut at the timing pointer inside the primary cover and just kicking it over, it does not need to run to check the correct timing with a Hunt mag....it should be sparking right at the 38 degree mark as it has no advance

If the timing has slipped again then put some red or blue Dykem on the taper and a little valve lapping compound on it the high parts will show all the non fitting parts and you can hand finish that part to get a good fit.

Most of the time when it runs for a second and quits it means the pilot jet is still plugged in the carb.
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Old 12-09-2015, 02:43 AM   #14
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Default Re: Triumph Joe Hunt Mag Problems

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'if you think its electric it usually turns out to be fuelling problem' and vice versa , that's what I've learnt on JJ . I'd suggest you check carb for blocked pilot jet.
I only said 'JJ' cuz I didn't want to embarrass Tony. ya' big lug.
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Old 12-10-2015, 04:37 PM   #15
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Default Re: Triumph Joe Hunt Mag Problems

Thanks for all the help with this.... Still no joy though.

Ive had a look at the pilot jets by removing the mixture screw and poking a with a needle, to be honest the needle only went in about 5mm and that was the same on both sides so im not sure thats helped.

Ive emptied the carb bowls, turned the petrol off and sprayed easy start in and still nothing.

checked the timing once again and tightened it up very tight.

checked the plug gaps.

changed the petrol.

As i say it started great first time last week and ran smooth but refused to start again. This tells me the mag is slipping.

Im considering doing away with the mag as this is the second time ive gone through all this with these things..
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Old 12-10-2015, 04:51 PM   #16
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Default Re: Triumph Joe Hunt Mag Problems

you are using copper HT leads arn't you???... just an idea cause Magnetos HATE, if not plain Dont work, if you have fitted carbon or silicon leads....
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Old 12-10-2015, 04:51 PM   #17
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Default Re: Triumph Joe Hunt Mag Problems

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Im considering doing away with the mag as this is the second time ive gone through all this with these things..
That's what I'd do. I've never really seen the need to run a magneto on a bike that will run without a battery using the stock ignition/charging set up. Seems like an unnecessary complicationon.

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Old 12-10-2015, 06:59 PM   #18
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Default Re: Triumph Joe Hunt Mag Problems

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That's what I'd do. I've never really seen the need to run a magneto on a bike that will run without a battery using the stock ignition/charging set up. Seems like an unnecessary complicationon.

Bob
Second that...
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Old 12-11-2015, 12:11 PM   #19
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Default Re: Triumph Joe Hunt Mag Problems

Im using shit cheap silicone leads! good call, ill give some copper ones a go.

Thanks Steve
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Old 12-11-2015, 01:17 PM   #20
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Default Re: Triumph Joe Hunt Mag Problems

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Im using shit cheap silicone leads! good call, ill give some copper ones a go.

Thanks Steve

that may very well be your problem,.... Magnetos HATE non Copper leads.... dunno why, some expert here may know why...????
let us know how it goes...
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