Tb42 missing straight petty carby details inside

[Virgil9]

Hello all, over the last week my maverick has developed a miss. What i have found whilst the car was running and pulling off leads one at a time is that no4 is not receiveing spark from the dizzy cap. I tried with another lead that i know is getting spark and it did not work . It has new dizzy cap and points new leads and plugs. All the contacts and button look fine to me.

I am a bit lost as to why only one point would not get spark so next step might be the extended button as per other threads.

Any hot tips would be appreciated cheers.

[threedogs]

Dont these dizzy's need an extended rotor button ???
Is there an after market electronic ignition available
for these set and forget I say

[taslucas]

Dont these dizzy's need an extended rotor button ???
Is there an after market electronic ignition available
for these set and forget I say

The electronic ignition module only replaces the points and still uses the rotor button and dizzy cap so if that's where the problem is then it won't fix it. Having said that, I'd still recommend fitting one. I installed the pertronix flame thrower 2 module and coil and it made a noticeable change in the power and economy.

Have you checked the spark plug?

>>>tappin from tassie

[Virgil9]

Yes all plugs are fine. No spark from dizzy on one point.

[taslucas]

Can you borrow another dissy cap to try?

>>>tappin from tassie

[Virgil9]

I have a brand new dizzy cap. There is continuity between the point inside the cap and the terminal on top where the lead connects. All i can think is my button needs replacing

[GQ TANK]

A combination of extended rotor button, pertonix ignition and points do help.

Have you changed the condenser and coil, as these have been know to cause missfire.

you have done the rest

The most common cause of a miss is the leads /Cap/plugs.

A cracked exhaust just below the manifold can be a cause and loss of powers

a vacuum leak on the inlet manifold can cause miss

a loose carby, can cause a miss. Remove the air cleaner grab the top of the carby and give it a shake


A faulty head or head gasket can be the cause -check the cylinder pressure

[taslucas]

I have a brand new dizzy cap. There is continuity between the point inside the cap and the terminal on top where the lead connects. All i can think is my button needs replacing

Well it looks like you've ruled everything out but that. Strange for the button to only miss on one lead though. Only thing left to do is swap the button I guess

>>>tappin from tassie

[Virgil9]

Yer i think ill just add the 4mm onto my button or buy the extended rotor next. Thanks for the help

[GQ TANK]

I dont think the extension is 4 mm, its around 2mm. I have heard of people extending their existing button. The main improvement is bettle idle, an the motor is a bit more responsive.

I don't think the rotar would be the route cause.

Could you have a bent dizzy shaft -I have heard it happening but don't know what the symptoms were