I agree with John Callahan re throttle shaft wear, although this usually shows itself at lower throttle settings where the leaking air represents a larger portion of the overall flow. Thoroughly check the diaphragms: wet with fuel on one side & gently stretch. Any perforation will show up as the fuel migrates through the hole to the dry side. We have seen a few where the location tab was misaligned too.
But before chasing too many phantoms, what do the plug electrodes look like? Plug colour is an excellent indicator of mixture troubles. Cheers, JGV From: [email protected] [mailto:[email protected]] On Behalf Of John Callahan Sent: Monday, 15 June 2015 10:12 AM To: [email protected] Subject: Re: [DOG mailing list] Rough running 2900-3000 rpm I have seen that happen with wear around the throttle shaft in the carbie. Otherwise float level 16.5mm and needle shoulder level with piston. If there is a problem with the diaphragm it will run rich. Regards, John. On 15 June 2015 at 09:45, Rob Thompson <[email protected]> wrote: G'day all, Our H36 Dimona is performing very well at 3200 full power climb out but throttle back a little bit to 2800-3000 and it starts to run rough. Lower power settings are smooth. In course pitch, speed up with a enough power and it happens in the same rev range but different throttle positions. It seems to sometimes improve with a bit of choke but not often enough to conclusively say that it is over lean at those RPMs. We have so far done metering needles, diaphragms, float levels and float needle valve. The carb has done a fair few hours A new one to me...any ideas? Rob Rob Thompson 0429 493828 <tel:0429%20493828> Please note that my new email address is [email protected] From: [email protected] To: [email protected] Date: Mon, 1 Jun 2015 22:52:53 +1200 Subject: [DOG mailing list] Dimona in New Zealand Perfection in fibreglass Ian Williams --------------------------------------------------------------------- You are subscribed to the Dimona Owners Group mailing list. To unsubscribe, send email to: [email protected]
