Timing problems

[liftedhigh]

My wifes machine was backfiring through the carb so I figured it was the timing. I took the cam cover off and it was off by almost 2 teeth. I tried to get timing dead on but couldn't the closest I could get it was half a tooth past the mark on the head. Because of that adjusting the valves was a real pain. But I fired it up and the backfiring was greatly reduced only did it once or twice in about 5 min.

My question is because I couldn't get it dead on does that mean the chain is stretched?

Is it gonna hurt anything running it off by half a tooth?

 

[YAMAHAULER]

yep get a new chain
before the piston meats the valves

 

[liftedhigh]

I have to take the whole top end off to swap the chain don't I?

 

[YAMAHAULER]

nope just the stator cover stator and fly wheel and the cam cover

 

[Gen1Pat]

And the timing chain tensioner.

 

[liftedhigh]

Oh I forgot to mention that the tensioner is not even half way out to make the chain tight.

 

[lbjamm]

Oh I forgot to mention that the tensioner is not even half way out to make the chain tight.

Then you don't need a new chain. The marks don't need to be perfectly inline. The backfiiring is prolly lean.

 

[Gen1Pat]

Ditto^^^

 

[liftedhigh]

I think I fixed it by adding fuel, i'll run it longer tomorrow to check for sure.

 

[beastlywarrior228]

Ya they'll never line up perfect

 

[MS_Warrior]

Ya they'll never line up perfect

Mine did. Till I put the vitos in! Lol

Sent from my ADR6350 using Tapatalk 2

 

[beastlywarrior228]

Mine did. Till I put the vitos in! Lol

Sent from my ADR6350 using Tapatalk 2

Shouldn't change anything, it changes the position of the pickup not the cam

 

[jasonp]

the key changes the positon of the flywheel slightly so this will move your timing marks.

 

[alex456123]

Doesn't matter they will still line up with a Vito's key. It moves the flywheel so the chain will move with it.

 

[jasonp]

Doesn't matter they will still line up with a Vito's key. It moves the flywheel so the chain will move with it.

Right, you still will be able to get the timing marks close to set cam timing. The key sets the postion of the flywheel and the crank gear drives the cam chain.

 

[beastlywarrior228]

Ah true the t is 4 degrees off too

 

[bones]

there is a timing mark on the cam chain sprocket on the crank and on the crank case just above the sprocket ... line them up put the key in and slide rotor on

 

[Gen1Pat]

The Vito's key changes ignition timing, NOT mechanical timing. The mechanical timing may appear to be off when you go to set timing, that is because on the 4* advance on the flywheel. That is why you do it the way Bones showed it. If all you are doing is installing the key and not taking the chain and cam gear apart, you only need to pull the flywheel and swap keys.

 

[jasonp]

The Vito's key changes ignition timing, NOT mechanical timing. The mechanical timing may appear to be off when you go to set timing, that is because on the 4* advance on the flywheel. That is why you do it the way Bones showed it. If all you are doing is installing the key and not taking the chain and cam gear apart, you only need to pull the flywheel and swap keys.

you hit the nail on the head perfectly. great post.

 

[Gen1Pat]

Thanks, helps to work on cars all day. lol