I just took my rolla out for a spin and after driving for about 10 mins, I noticed than when i put my foot down the engine bogged down and through the rev range it seemed to cough & splutter

 

The other thing i noticed was that it had trouble revving past about 5000rpm(didn't seem to want to rev out)

 

I think it has something to do with the carbs (twin dellortos) But i'm really not sure

 

Has anyone come across this and how can i fix?

Timing? carbs could be out of balance?

Timing? carbs could be out of balance?

 

Is that something that would happen all of a sudden? When i drove it yesterday it seemed fine

Edited May 1, 200818 yr by KE ping it real

Could also be a lack of fuel..

 

Anything could happen all of a sudden, Are you trying to diagnose the problem or do you just want to guess?

I'm trying to see if it's something i can fix myself or if i need to take it to someone

 

I'm by no means a mehcanic(i mean mechanic) but if its something i can adjust or check myself then i'll have a go

 

All i know is that it was perhaps running a bit rich yesterday but still running well and now it seems to have dramatically

deteriorated

 

If i slow roll the throttle then it revs ok but if i floor it then it struggles but it wasn't doing this yesterday

Edited May 1, 200818 yr by KE ping it real

Get a timing light on it and eliminate the timing first, Check your fuel filter isn't blocked, After that it pretty much comes back to an issue somewhere with the carbs (balance/mixtures etc).

Get a timing light on it and eliminate the timing first, Check your fuel filter isn't blocked, After that it pretty much comes back to an issue somewhere with the carbs (balance/mixtures etc).

 

No worries Medicine Man

 

Thanks for your help - I've got a mate with a timing light so i'll check that tomorrow an i'll check the fuel filter tonight

 

If all else fails i'll send it off to get the carbies sorted

 

Cheers

Well its definitly not the fuel filter

 

But the problem seems to be getting even worse

 

I'ts just about undriveable now, after testing the new fuel filter (i had one lying around) i was lucky to get it back up the driveway

 

I guess it must be the carbs or the timing:bash:

Edited May 1, 200818 yr by KE ping it real

if you just had the 1 carb it would be simple, leen it off a little at a time and rev it, if it lags it would be ritch and if it stals after you rev it its too leen. when set well (if you just had 1 carb) the reaction time would be good and it would idle well, as for a dubble set up i would think to maybe diss conect the link raill ant set 1 at a time. or does this dubble your fuel so as its too ritch? i hate twins for this only..

 

for the others who read this and have 1 carby, when you take it for a spin, have a flat head on the seat cos if it does cut out you can ritchen it up to get you home. happened too me lots haha.

Check you points in the dizzy, they could have closed up!

Check you points in the dizzy, they could have closed up!

 

Electronic ignition in it but i just git a new dizzy cap as the old coil lead had fused to the cap and when i changed engines over i had to change the coil lead due to the distance from the dizzy

Went to pull it off and then snap

 

So new dizzi cap aswell

if you just had the 1 carb it would be simple, leen it off a little at a time and rev it, if it lags it would be ritch and if it stals after you rev it its too leen. when set well (if you just had 1 carb) the reaction time would be good and it would idle well, as for a dubble set up i would think to maybe diss conect the link raill ant set 1 at a time. or does this dubble your fuel so as its too ritch? i hate twins for this only..

 

for the others who read this and have 1 carby, when you take it for a spin, have a flat head on the seat cos if it does cut out you can ritchen it up to get you home. happened too me lots haha.

 

Aaah but when the twins were running well

 

They were running VERRRRY well

could be accelerator pump - even though I own a set, I can't remember if/what the dellorto one is like.

 

Acc pumps have a check valve in them, to stop fuel in the pump valve running back to the bowl when you gas it. This busted, and it meant every time I put my foot down it went back to the bowl, leaning out every time I accelerated.

 

Gives similar symptoms: still driveable but not if you gas it. SHOULDN'T deteriorate over time, though, so it may be something different.

I've got a mechanic mate coming over to look at it and give me his diagnosis and maybe he can fix it

 

Fingers crossed

 

However i spoke to another mate today and he seems to think that the carbs have just gone out of tune

and reckons they will need to be adjusted/tuned every couple of months

 

Is this common/true?

Edited May 2, 200818 yr by KE ping it real

I wouldn't say every couple of months, Mabey 6-12 months..

 

Dellortos or any twincarb need to be kept in balance..