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S65 carb woes
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<blockquote data-quote="Sams65" data-source="post: 187491" data-attributes="member: 12820"><p>Thanks very much for the feedback everyone - will do my best to answer questions below.</p><p></p><p></p><p>Referring here to the settings suggested by the Honda service manual as well as Clymer's (so things like checking stamped numbers of jets to make sure they match what's in the book / turning idle mixture screw to the factory setting of 1.5 turns from fully seated, jet needle clip on 3rd position / float height set to 19.5mm etc.)</p><p></p><p></p><p>I tried this - I had set the float to where engine wasn't getting gas at all and then backed it up to the point where just a bare minimum amount of gas was resting at the bottom of the bowl (enough to fire up the engine) Still smoked like crazy and fouled the plug. But might do some more experimenting with this until a better option comes along.</p><p></p><p></p><p>Interesting point about the head - The original bike was a barn find that had been abused at some point with a bunch of broken fins, so I sourced brand new NOS head and cylinder. Both came from Davidsilverspares.com. Made sure to avoid knock off parts whenever possible.</p><p></p><p>Tried also to run without air filter but it made no difference. I used a leak down tester and numbers came out perfect, indicating no leak whatsoever. This also surprised me a bit since on other engine rebuilds I've done, I've never gotten perfect numbers, even after a complete break in.</p><p></p><p></p><p>Engine was rebuilt from the crank-up and leak-down test passed with flying colors. Sorry, when I meant bike moved under its own power, was just a bad way of me saying I never ended up having to push it. However, power would flat-line quickly. It never got past around 25mph as indicated on the speedo (however accurate it may be)</p><p></p><p></p><p>I've tried 3 different carbs in total so far, 2 Keihins and a Mikuni. The only numbers I was able to find on each one are as follows:</p><p><strong>1st Keihin: </strong><em>17B</em></p><p><strong>2nd Keihin</strong> (currently on bike): <em>S65B</em> on top of carb / <em>JC E</em> (or what looks like an e with the top half missing) on side of carb facing the engine</p><p><strong>Mikuni:</strong> <em>17-2</em></p><p></p><p></p><p>This has the paper filter and there's a rubber tube that runs along the inside of the frame into the carb. However, I've tried running it with both out and makes no difference.</p><p></p><p>I've replaced the head, cylinder, piston and rings during the rebuild. All parts sourced from David Silver Spares.</p></blockquote><p></p>
[QUOTE="Sams65, post: 187491, member: 12820"] Thanks very much for the feedback everyone - will do my best to answer questions below. Referring here to the settings suggested by the Honda service manual as well as Clymer's (so things like checking stamped numbers of jets to make sure they match what's in the book / turning idle mixture screw to the factory setting of 1.5 turns from fully seated, jet needle clip on 3rd position / float height set to 19.5mm etc.) I tried this - I had set the float to where engine wasn't getting gas at all and then backed it up to the point where just a bare minimum amount of gas was resting at the bottom of the bowl (enough to fire up the engine) Still smoked like crazy and fouled the plug. But might do some more experimenting with this until a better option comes along. Interesting point about the head - The original bike was a barn find that had been abused at some point with a bunch of broken fins, so I sourced brand new NOS head and cylinder. Both came from Davidsilverspares.com. Made sure to avoid knock off parts whenever possible. Tried also to run without air filter but it made no difference. I used a leak down tester and numbers came out perfect, indicating no leak whatsoever. This also surprised me a bit since on other engine rebuilds I've done, I've never gotten perfect numbers, even after a complete break in. Engine was rebuilt from the crank-up and leak-down test passed with flying colors. Sorry, when I meant bike moved under its own power, was just a bad way of me saying I never ended up having to push it. However, power would flat-line quickly. It never got past around 25mph as indicated on the speedo (however accurate it may be) I've tried 3 different carbs in total so far, 2 Keihins and a Mikuni. The only numbers I was able to find on each one are as follows: [B]1st Keihin: [/B][I]17B[/I] [B]2nd Keihin[/B] (currently on bike): [I]S65B[/I] on top of carb / [I]JC E[/I] (or what looks like an e with the top half missing) on side of carb facing the engine [B]Mikuni:[/B] [I]17-2[/I] This has the paper filter and there's a rubber tube that runs along the inside of the frame into the carb. However, I've tried running it with both out and makes no difference. I've replaced the head, cylinder, piston and rings during the rebuild. All parts sourced from David Silver Spares. [/QUOTE]
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