Ihave a 107ci advacned timing,with decompression releases and a 1.8 terry starter, once in a while if I hold the start button to long (1,2,3,4 ) I get a load clunck noise !! starter turns the motor over fine for the 1,2,3,4, count then clunck !! .

do you think it is the starter clutch working to hard ?? not able to turn the motor over any more and the clutch disengages
(battery is all chagred up)

thanks

That clunck could be the starter clutch releasing then re-engaging again. If your cranking fuel is off or your timing is too far advanced, you could be getting a kickback or partial combustion causing the starter clutch to either slip due to detonation or disengage, re-engage during apartial combustion power stroke. I had to experiment with timing and fuel in the 0-500 RPM cranking range. Don't know what you have for a tuner and tuning capabilitiesthough. If this continues too long your starter clutch will startslipping, I went thru a couple of these clutch assemblies before I finally resolved the problem. For a while I wasstarting to think it was a defectiveCrank Sensor not being able to pick up astrong enough of a signal during cranking RPMonly but itscoped out OK.

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01 Ultra Classic, Garrett TurboCharger @ 10 PSI, 107 CI Twin Cam, S&S ported/polished heads, Andrews Gear Drive Cams, Rivera Clutch, S&S VFI ECU, Baker DD6 Six Speed.

thank you , I have a Zippers (Daytona Twin tech)TC88 ignition withthe Zippers curve, I am going to get there interface cable and software, I may have a few questions then I get it !!!

thanks again