if they were any good at what they are doing. i switched to lpg and its now the opposite, too rich (thats cause of the set up i chose- twin lpg) too rich for me causes detonation- opposite to petrol.

silvia-specr i did run 2 fuel pumps old one and new one with no difference

b310gx i have only just got the motor running . has i say in the first post was sitting in my shed for a year or 2 andy had the motor befor me and the motor reved to 8500 when he had it so not much could of changed :?
unknow km's on the motor
new plugs
new coil was recomemded by auto shop
has a big cam not shore on size tho

im not shore if the tuner put it on the dyno has i though all dynos tell you hp ? maybe he did a street tune .

What plugs and coil are you using ?

perthute, from what I can gather from your posts, is that you did not open the motor up and played with the head, I know Rezlo also had reving issues on his A15, maybe search for the post, something could come out of it.

Sounds like an ignition problem, has the dizzy been regraphed to run without vac and for the cam?

As for fuel, you need around 2-3psi at idle and this cannot drop below 1.5psi, thats the best way to make sure you have enough fuel watch that pressure gauge like a hawk, at high revs you still need at least 1.5psi... that way you know the flow is enough, if it drops fit the other pump in parallel to increase flow.

If you sort all that out, what size chokes are in the 40's? Your getting more out of it when you back it off because you are choking the carb slightly richening the mix so your getting too much air for the current situation, BUT this could be because of not enough fuel etc incorrect spark. so sort those issues out first.

Have you timed the cam or was the cam timed before you got hold of it, did the carbs come with the motor and are they for the motor, also what happened to the dizzy that was on it in the first place?

Rezlo's head was incorrectly assembled. The inner valve springs was not working due to incorrect installment of that cap thingy that holds the valve springs onto the head.

My bet would be carbs.

Just a thought - disconnect any tacho or rev limiter you may have. My coupe would not rev past 6000 on occasion at the track and the problem was the standard coupe tacho. Diconnected it and looped the connectors and all good! Tacho's are often the source of electrical gremlins - worth a try.
Cheers

Check valve spring seat pressure, very easy just with valve cover off, mine did identical thing to what your discribing and as gxman said, it was due to machine shop not using the supplied spring seats, rather the stock washer style shims = no spring pressure on my tomei dual springs = 6300rpm rev limit... with the right shims thanks to Mr B projects she revs to 8500-9000 easy.

thanks WhiteSedan i will do all the things you said tomorro :)

yes the hole motor came complete and with the twin 40 sidedrafts webbers i havent opened the motor up.
i guess that means the cam is timed for the motor ?
i have the same problem with the points dizzy so i upgraded to a elecy dizzy
no i havnt got the dizzy regraphed to run without vac

gee i thought these old motors are ment to be user friendly $4000 later n im starting to wish i went with a new efi turbo motor

im using ngkbpr6ey has the tuner told me i need these
the coil dont seem to have a name/partnumber but im going on a spending spree tomorro so i get the one tha dundee told me to get and fuel pressure gauge and anything elece you guys come up with

im racing this in 2 weeks so im realy hoping to get it sorted

thanks very much guys

where are you racing?