Thanks Josh Yamaha 4hp 2 cycle. I can get serial number if you need more info…
David F. Risch (401) 419-4650 From: CnC-List <cnc-list-boun...@cnc-list.com> On Behalf Of Josh Muckley via CnC-List Sent: Wednesday, June 10, 2020 10:36 AM To: C&C List <cnc-list@cnc-list.com> Cc: Josh Muckley <muckl...@gmail.com> Subject: Re: Stus-List Yamaha 4hp 2 cycle David, There has to be an orifice (jet) or screw. Are you sure a screw isn't hidden under a plastic cowl? Get me an exact make and model so I can do some research. Josh On Wed, Jun 10, 2020, 08:08 David Risch via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Josh and Chuck, Mixture is new with AV gas so no issues there. Only one adjustment screw on carb. Seems to only affect low throttle. As said all good in neutral and good up until ¾ throttle in gear. Chuck mentioned if spark plug grey and chalky, which it is, it is running lean at top end. How does one adjust top end without adjustment screw. Thanks in advance. David F. Risch (401) 419-4650 From: CnC-List <cnc-list-boun...@cnc-list.com<mailto:cnc-list-boun...@cnc-list.com>> On Behalf Of Josh Muckley via CnC-List Sent: Sunday, June 7, 2020 10:17 AM To: C&C List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> Cc: Josh Muckley <muckl...@gmail.com<mailto:muckl...@gmail.com>> Subject: Re: Stus-List Yamaha 4hp 2 cycle Follow my carb tuning video. Post back with questions. https://youtu.be/caIdvC8WGDg Sounds like the idle/throttle screw (T) is keeping the butterfly open too far with no throttle applied. It just so happens that in gear there is enough load to slow 'er down. At full throttle is sounds like probably too much fuel (H). I think that if it was too little it would die. Since both of these "symptoms could be a result of too much low throttle fuel (L) you should probably start by dialing it back a bit and see how thing go. By doing this you will lower the fuel at idle AND lower the fuel a full throttle. If you're lucky and my diagnosis is correct then you'll kill too birds with one stone. My advice is based on having 3 adjustment screws H (high throttle), L (low throttle), T (min throttle). If you're missing any one of these then it has a jet which serves in its place. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Sun, Jun 7, 2020, 09:29 David Risch via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: So instead of giving it away I rebuilt the carb and half dozen other fixes this winter. Runs and idles great, but at full throttle she bogs down continues to run, but sounds rougher. When out gear it goes right to full throttle. Perhaps overpropped? Sent from my Android. Please forgive typos. Thank you. _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
