96 replies to this topic

[JakeJakeJake]

Still waiting for dizzy to arrive should be here today, that said it should have been here monday.

If that does not make any difference what should I try?

Also is there anything else worth trying in the mean time?

[JakeJakeJake]

The bushes inside the dizzy. If they are shot the arm may not run correctly.

Had the dizzy off and there was absolutely no play in it at all, so I don't think this is the problem.

Have put points and condenser back in, now it will not even start.

Think in is time I took it a garage.

Thanks for everyone's suggestions.

[1977 Loud_Mini]

Just to let you know the little black thing that slides over the needle was correct i've checked 4 carbs today and the all have that little lip on the top. Also when changing all the HT leads etc have you put them back on in this order: 1,3,4,2 going anti clockwise starting at the 1 or 2 o clock position on the distributor cap? because you said removing plug leads on cylinder 2 and 3 made no difference to the engines running which would indicate the engine isn't running on these 2 cylinders.

[JakeJakeJake]

Just to let you know the little black thing that slides over the needle was correct i've checked 4 carbs today and the all have that little lip on the top. Also when changing all the HT leads etc have you put them back on in this order: 1,3,4,2 going anti clockwise starting at the 1 or 2 o clock position on the distributor cap? because you said removing plug leads on cylinder 2 and 3 made no difference to the engines running which would indicate the engine isn't running on these 2 cylinders.

Yeh I found the little black thing was fine when I got my new needle from mini sport, apparently a lot of people make that mistake.

The order is 1 3 4 2 going anti clockwise. Basically it is not firing correctly on cylinder 2 or 3. But now it will not even start.

[1977 Loud_Mini]

I can't think what else it could be because most on here have suggested the causes for the misfire and you even changed the head gasket which seemed the most appropriate action to take, and it didn't cure it.

[AzMaN]

This problems needs some

Ok so you say its not firing on 2 & 3, is it sparking though?

have you done a compresion test? i know you changed the HG but compresion tests can show alot of other things other than HG failure.

[JakeJakeJake]

This problems needs some

Ok so you say its not firing on 2 & 3, is it sparking though?

have you done a compresion test? i know you changed the HG but compresion tests can show alot of other things other than HG failure.

It sparks outside the block fine, also when I attach a timing strobe to each HT lead they flash steadily.

Compression test was 180 on all four cylinders.

[hawky443]

Not read the post but i had this in one of my old cars, its was a new coil pack it needed!!

[JakeJakeJake]

Not read the post but i had this in one of my old cars, its was a new coil pack it needed!!

tried a new coil, made no difference

[AzMaN]

This problems needs some

Ok so you say its not firing on 2 & 3, is it sparking though?

have you done a compresion test? i know you changed the HG but compresion tests can show alot of other things other than HG failure.

It sparks outside the block fine, also when I attach a timing strobe to each HT lead they flash steadily.

Compression test was 180 on all four cylinders.

ah yes missed the compresion results above.

right so we can assume trying to fire then, and compresion seams ok rule out any major problems.

2 sujestions i can make

try the carburation route: strip the carb down, clean everything, reset it back to to standard (jet level then in 2 turns if i remember right but dont quote me on it). is the air filter dirty?

when you build the engine, did you use a duplex timing kit? did you tighten the bolts up enogth incase the timing has sliped?

[JakeJakeJake]

This problems needs some

Ok so you say its not firing on 2 & 3, is it sparking though?

have you done a compresion test? i know you changed the HG but compresion tests can show alot of other things other than HG failure.

It sparks outside the block fine, also when I attach a timing strobe to each HT lead they flash steadily.

Compression test was 180 on all four cylinders.

ah yes missed the compresion results above.

right so we can assume trying to fire then, and compresion seams ok rule out any major problems.

2 sujestions i can make

try the carburation route: strip the carb down, clean everything, reset it back to to standard (jet level then in 2 turns if i remember right but dont quote me on it). is the air filter dirty?

when you build the engine, did you use a duplex timing kit? did you tighten the bolts up enogth incase the timing has sliped?

Stripped the carb, jet is about 2mm off the top. Air filter is clean.

The engine was built about 7 years ago by minisport and has since done about 15k miles, so I don't know about that.

[AzMaN]

This problems needs some

Ok so you say its not firing on 2 & 3, is it sparking though?

have you done a compresion test? i know you changed the HG but compresion tests can show alot of other things other than HG failure.

It sparks outside the block fine, also when I attach a timing strobe to each HT lead they flash steadily.

Compression test was 180 on all four cylinders.

ah yes missed the compresion results above.

right so we can assume trying to fire then, and compresion seams ok rule out any major problems.

2 sujestions i can make

try the carburation route: strip the carb down, clean everything, reset it back to to standard (jet level then in 2 turns if i remember right but dont quote me on it). is the air filter dirty?

when you build the engine, did you use a duplex timing kit? did you tighten the bolts up enogth incase the timing has sliped?

Stripped the carb, jet is about 2mm off the top. Air filter is clean.

The engine was built about 7 years ago by minisport and has since done about 15k miles, so I don't know about that.

appoligies i thought it was a new build.

[Carlzilla]

Hmm, longshot as to the cause of the misfire, but do you have uprated valve springs in, and was it a new cam at rebuild or an old one?

[JakeJakeJake]

Hmm, longshot as to the cause of the misfire, but do you have uprated valve springs in, and was it a new cam at rebuild or an old one?

Has "Extra strong double valve springs" and I assume a brand new cam seeing as it was a brand new engine.

[Carlzilla]

now youve said that, im thinking at a longshot that the cam lobes may be worn if it wasnt a new cam, did you check to see that the pushrods were straight when you changed the head gasket?
And did the misfire gradually come along or was it sudden?

because the only thing im thinking right now, is that you have good compression, that the cause of the misfire is due to bad fuelling, if you can eliminate the carb from the equation, then it may be that the valves arent opening properly

Edited by Carlzilla, 09 January 2011 - 10:46 PM.