Thanks again for all the help. Whats worth replacing when i go to do timing and why would it have jumped? Engine had been rebuilt before I got it and what would have caused timing to jump as it was running sweet up until last sunday??
Its all good experience i suppose !
Cheers again for the help
Its all good experience i suppose !
Cheers again for the help
fett
Well-Known Member
dont know, on mine the orginal failure was down to the amp module on the dizzy, I dont know if the ealier ones like yours have them? anyway that went then one mechanic took it out and then three couldnt get it back in right- they are a pita to do as it rotates on the drive gear as you slide it in.
has yours got an amp or have we been down that route, sorry I havnt read the whole thing.
has yours got an amp or have we been down that route, sorry I havnt read the whole thing.
Nope was driving when it started missing. Left it overnight wouldnt start next day. Been checking everything so i had tried adjusting timing while someone cranked it over, adjusted afm as thought it was flooding? had fuel pump out also to check it was not blocked at the filter. Where could i get a gauge to check fuel pressure?
Mr Noisy
Coming in your ears.
Like we said a while back, I had a similar problem where I drove for 40 minutes on the motorway, turned it off, started it up 30 mins later and within 2 minutes it started to splutter and then die, and wouldnt restart!
Turns out my ignition timing had gone miles out. Check this though:
Couldn't get the ****er running after 4 hours of messing about, borrowed a dizzy cap and it reluctantly fired up and then ran sweet for 15 minutes, where it then started to die again and wouldnt restart.
Whole thing made no sense.
All I can say is check your cam timing as best you can via checking both valves close on each cylinder before it starts it's compression stroke.
Run the fuel pump and then crack off the union on the fuel feed pipe at the fuel rail - fuel should spray out, hence good pressure.
Crank the motor with the plugs out and check that you get a good puff of fuel out of each plug hole just before the same plug sparks. Make sure the spark is nice and bright on each cylinder too.
Then it's all down to timing. Check and check again that on no1 compression tdc the rotor points to no1 tower on the dizzy cap.
Whenever my motors timing goes out or it gets flooded it coughs coughs coughs but cannot quite catch up enough to start.
Will yours run on easy start???
Turns out my ignition timing had gone miles out. Check this though:
Couldn't get the ****er running after 4 hours of messing about, borrowed a dizzy cap and it reluctantly fired up and then ran sweet for 15 minutes, where it then started to die again and wouldnt restart.
Whole thing made no sense.
All I can say is check your cam timing as best you can via checking both valves close on each cylinder before it starts it's compression stroke.
Run the fuel pump and then crack off the union on the fuel feed pipe at the fuel rail - fuel should spray out, hence good pressure.
Crank the motor with the plugs out and check that you get a good puff of fuel out of each plug hole just before the same plug sparks. Make sure the spark is nice and bright on each cylinder too.
Then it's all down to timing. Check and check again that on no1 compression tdc the rotor points to no1 tower on the dizzy cap.
Whenever my motors timing goes out or it gets flooded it coughs coughs coughs but cannot quite catch up enough to start.
Will yours run on easy start???
Mr Noisy
Coming in your ears.
nobody knows!
Fett, Noisy and classic kev I cant thank you guys enough. engine is now idling again but still back firing will just need slight timing adjust tomorrow to dizzy (when i can get some day light). I think timing jumped originally due to bracket not being tight enough at bottom of dizzy and then backfire would have damaged vacuum hose and me fiddling with afm and idle setting didnt help either. However got there in the end and its all good fun cant wait to get back out on the road in my 90 again 
Cheers
Cheers
Mr Noisy
Coming in your ears.
Good to hear it's running pal, no problem
Fett, I don't really know mate. I didn't change a single component and oncenit was adjusted it was great again.
The reason i didnt alter the dizzy on the off road day is because I had literally days before just rebuilt the dizzy with new advance springs etc, and reset the timing.
Can only assume the dizzy was stuck advanced when I set the timing, and something sprung back when it was warm and i started it up again. This is why it retarded with no apparent cause!
Anyway, glad to hear your 90 is getting there
Fett, I don't really know mate. I didn't change a single component and oncenit was adjusted it was great again.
The reason i didnt alter the dizzy on the off road day is because I had literally days before just rebuilt the dizzy with new advance springs etc, and reset the timing.
Can only assume the dizzy was stuck advanced when I set the timing, and something sprung back when it was warm and i started it up again. This is why it retarded with no apparent cause!
Anyway, glad to hear your 90 is getting there
