So far I've seen I'm supposed to change the jets, needles, diaphragms, floats, springs, o-rings, gaskets..... What's left besides the carb shell itself and the piston? Maybe new carbs would be cheaper? I've verified the carbs are in their original stock condition. I'm now looking for other causes. I'll run the fresh gas test this evening, hopefully.
Less than 200 in parts i went thru mine including all new jets etc chamber floats et al. Easy to plug in new parts and have some spares theres a set of 32 on ebay for around 200 Worth the dollars spent runs quite nicely now
It's not bad gas. I ran it with some ethanol-free premium, and the problem persists. I get it up to cruising speed at 45mph or so, and any throttle twist beyond about ½ , and it just won’t accelerate any further. Half or less, and it seems to run fine. The issue seems to effect both cylinders. Checked the airway, and the air filter looks like new. When I opened the petcocks to drain the fuel last night, it flowed plenty.<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-comfficeffice" /><o></o> <o></o> Must be an electrical problem. Time to get out the hammer.<o></o>
these are sea level settings for your carb .. main jet 145 2.68 needle jet #1 needle replace if worn .. low speed circuit screw about one full turn out if you have a set precision drills with digital calipers. find a 1.45 mm drill then measure with calipers. then insert into drill index... carefully drill out main jets to 1.45mm. file off 135 marks. the 2.68 needle jet needs to be purchased. unless you have a jeweler's lathe. it may be easier for most to simply purchase new main jets and needle jets.
Most recommend removing that whole system and rerouting the fuel lines like the bikes without that system. Drill pits don't make round holes as far as being precise is concerned. You need a ream to make the hole round.
When you say solenoid, I am visualising an electric solenoid. Am I on the same page or is it something non electric?
you are dead wrong if you think main jet holes need to be perfectly round. what counts is hole size be accurate. I've personally custom jetted hundred of carbs (mostly Weber) using same jetting tools shown below from Dellorto's UK website. what I showed in prior post uses Chinese made drill index that cost $5 for each set. base of drills can be used as jet size gauge. but a precision set of metric calipers are needed to measure drill bit sizes. most folks cannot justify spending $$$ for jetting tools. but certainly can afford to spend say $10 for 2 metric drill index. most mechanics will have a set of calipers in their toolbox. <table align="center" border="0" cellpadding="0" cellspacing="0" width="600"><tbody><tr><td>Jet drill set </td> <td> </td> <td> Part No - JET DRILL </td><td> £39.97 ex. VAT </td><td> </td><td> Details & Buy </td></tr><tr> </tr><tr> <td colspan="5" height="1" bgcolor="#CCCCCC"> </td> </tr><tr> <td colspan="5" height="20"> </td> </tr> <tr> <td> Jet drill set </td> <td> </td> <td> Part No - JET DRILL </td><td> £39.97 ex. VAT </td><td> [click to show pic] [click to show pic] </td><td> Details & Buy </td></tr><tr> </tr><tr> <td colspan="5" height="1" bgcolor="#CCCCCC"> </td> </tr><tr> <td colspan="5" height="20"> </td> </tr> <tr> <td> Jet sizing tool - 0.45 - 1.50mm </td> <td> </td> <td> Part No - JET SIZER SMALL </td><td> £36.73 ex. VAT </td><td> </td><td> Details & Buy </td></tr><tr> </tr><tr> <td colspan="5" height="1" bgcolor="#CCCCCC"> </td> </tr><tr> <td colspan="5" height="20"> </td> </tr> <tr> <td> Jet sizing tool - 1.50 - 3.00mm </td> <td> </td> <td> Part No - JET SIZER LARGE </td><td> £36.73 ex. VAT </td><td> </td><td> Details & Buy </td></tr><tr> </tr><tr> <td colspan="5" height="1" bgcolor="#CCCCCC"> </td> </tr><tr> <td colspan="5" height="20"> </td> </tr> <tr> <td> Jet reamer set </td> <td> </td> <td> Part No - JET REAMER </td><td> £52.48 ex. VAT </td><td> </td><td> Details & Buy </td></tr><tr> </tr><tr> <td colspan="5" height="1" bgcolor="#CCCCCC"> </td> </tr><tr> <td colspan="5" height="20"> </td></tr></tbody></table>
Jets holes don't need to be perfectly round but they do need to be perfectly the same. Your not going to get close to that without reams. Close enough to work? Sure but there's enough variables already. Why add more? Plus, by time you find out you've gone too far, you need to buy more jets anyway. If your just jetting one carb or a lot, I think it's more cost effective, consistent, and time saving to buy jets. I will hand file slide angles but you have to be very careful doing that when more than one carb is involved. Of course, you can't go back richer then either but slides are so much more expensive than jets.
it's obvious that you've never drilled out custom jets. so why are you telling folks custom drilling out jet sizes will not work? I've custom jetted hundreds of carbs with methods exactly as described. tools shown above is from Dellorto's UK website and available to anyone for purchase. drilling out two jets with same bit results in two identical holes. then use jet hole gauge set to measure hole size. since most folks will not have a hole gauge, simply use base of drill bits to check size. a pair of calipers are needed to verify drill bit sizes. it's quite possible to fill hole backup with solder, then drill out to desired jet size. if jets are readily available in correct size. I'll use a factory jet over a custom drilled out jet. but not for accuracy, for time saved. custom jetting is really for advanced tuners ... or someone wanting to save $$$ and time waiting for new jets to arrive via snail mail. knowing how to custom drill jet sizes could come in quite handy when one has no access to factory jets. just checked .. my two Chinese drill index cost $3 each purchased at Steve's wholesale in Tulsa. My hole gauges and German made taper jet reamers were purchased from Weber many years ago. old meets new .. my old Weber height gauge and state of the art Backup power supply being tested for AntiGravity.
I never said it won't work. I said buying jets will work better. It's obvious that I haven't jetted hundreds of the carbs you have but this is an airhead forum. It's obvious to me that you haven't jetted many airhead Bings but . . . I have. No, I haven't drilled many Bing CV jets. Why should I? They are cheap and I have all the sizes in my shop. Like I said earlier, I am sure drill bits will work but you mentioned being precise. That isn't happening with drill bits. That's why they make reams. Yes again, I know it is quite possible to fill in the holes with solder and re-drill them but why? Jets are a couple of bucks. Drilling out needle jets is going to take a lathe and going through the trouble of centering them up real good. And a ream! Why not just buy jets? They are much more accurate store bought. Advanced tuners? Give me a break! Advanced tuners have all the jets in stock. Why not? It's both cheaper and faster and more accurate. Time saved? Who doesn't keep jets in stock? It will save you buying all that stuff in your pictures. I know some people that would say you have a bad case of chrome fever with all those tools. If only we were talking about Webers! But I suspect if the discussion was about Webers it would be going about the same as it is so far.
you've never custom drilled jets before ... so why are you making crap up on a topic you've obviously have no clue about? going riding ... troll away ..
Turns out the atomizers were clogged up a bit and the carbs were simply in need of a rebuild. This bike is a GSPD, so it doesn't have the electronic valves for fuel and venting. My Mystic did, but I removed it all and went back to basic. Sorry this thread went into the gutter....seems they all do eventually. Bike's running great now. Thanks!