Jester,
As I said in the Pulsar dizzy thread (see in top of Mods forum) the standard advance plate in a Pulsar gives 14-15 degrees centrifugal advance AT THE DIZZY. This is 2x that at the crank, ie 28-30 degrees.
This is too much for many A series engines, particularly 1275s- many want no more than 25 degrees max.

The 2 slots in the dizzy camplate need shortening so that there is only 9-10 degrees advance travel, not 14-15. See the Pulsar dizzy thread for how-to details.
Or, post it to Russell Engineering, Graham will modify it at minimal cost.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Hi, yeh i have already done that mod. i have had two plates modded wih slightly different lengths and have tried both.

i think my problem lies in the dizzy advancing to soon. it seems to advance to 15 degrees by about 1500-2000rpm.

anyway i will keep playing with it until its no longer pinging and performance is acceptable.

thanks for your advice guuys.

Jason

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'66 BRG Morris Mini Deluxe 60HP ATW

Spent many nights this week playing with spring setups in the dizzy. am pretty sure i have it about right now.

i found modifying the origonal large springs in the pulsar dizzy worked best for my application.

timing now is much better no pinging at all throughout the rev range. i have found though that the engine is not very happy at lower rpms now and tends to miss a little and have a cough or two depending on throttle position. i think this may be down to needle and carby spring combination, which i will continue to play with.

timing is now at 3 degrees at idle and advances to a max of 24 at 4000 rpm. with the modded springs the advance holds a little longer before advancing now and so doesnt advance so much it pings in the lower rev ranges. my tming light shows about 10 degrees at 2000 15 degree at 3000 and 24 degrees at 4000 rpm.

bare in mind i have modded the plate so full advance does not travel as far as the origonal pulsar dizzy was engineered. i welded the plate and carefully die grinded the slots as per the instructions/measurements on this website.

also discovered this week that the engine was fitted with BP5es plugs which are probably to hot for a high compression engine, so i went 2 cooler, and fitted BP7es. i am hoping this combination is beginning to solve the tunig issues i am having with this engine.

Jason

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'66 BRG Morris Mini Deluxe 60HP ATW