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Truimph 2000 timing query


Woody2000
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Hi am starting to get my project up and running have got the engine running after 10-12 years in a garage 

it has a high lift cam fitted so wondered if anyone knew what the timing should be ??? 

Have it set at about 25 degrees BTDC at the moment runs ok ??

thanks Mark 

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Would expect static timing of 10-12 btdc.

The best way is a test drive, if the engine pinks at around 2,000rpm on full throttle, retard the ignition timing slightly. If it doesn't pink, advance in small steps until it does, then retard just enough to prevent pinking.

Nigel

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Any idea what cam?

25º static / idle is definitely too much.  TBH I'm surprised it starts - I'd expect it to be stopping the starter in it's tracks as it tries to run backwards.  It will also be getting extremely advanced as the revs get up - potentially as much as  40º at 4000 - which is easily enough to cause detonation and engine damage at big throttle openings.

Might be worth bearing in mind that the timing marks on these sometimes move as they are marked on the harmonic balancer weight, which sometimes becomes unbonded and moves  on the pulley assembly.  

Having said all that, if it's a fairly wild cam, it will respond well to lots of timing at idle/low rpm (25º is still alot!), but in order to safely run lots of advance you need to limit the the total mechanical advance timing to somewhere in the 30 - 32º region.

Nick

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10 hours ago, Nick Jones said:

25º static / idle is definitely too much.  TBH I'm surprised it starts -

I'm not.

I had a Mk1 Vitesse where the mechanical advance seized in the fully advanced position. It still started and ran.

I had a Stag which got set up (by a well-known Triumph specialist) off the wrong cylinder and by a nick in the pulley - was almost 30 degrees out and still started.

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4 hours ago, NonMember said:

I'm not.

I had a Mk1 Vitesse where the mechanical advance seized in the fully advanced position. It still started and ran.

Similar on my 2.5PI.  Dizzy advance mech not fully seized but very sticky and hanging up intermittently.  I was having problems with that slowing the starter and it sometimes

"knocked" as it started.  Also problems getting the idle speed down though that was partly poorly sealing butterflies.  Took me way to long to clock the dizzy problem..........

Nick

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I've had engines almost refuse to start when there's too much static advance. The starter struggled to turn it over as the premature sparks try to push the pistons back down the bores.

It's worse on classic bikes, the kick back on the kick start lever can really hurt your leg!

Nigel

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