| Author | Message | ||
     Triman023 |
Still trying to get the CV carb I bought to work better. It is running rich with the stock S2 exhaust. I have reset the float to spec and have the pilot screw out 2 turns. Fuel mileage is about 30MPG that is low for me. Going to look at the plugs today. It has a 45 pilot jet and a 185 main jet, will check to see where the needle is. What is the stock setup for the original exhaust? Thanks | ||
| Ratbuell |
You probably want a 40 or 42 slow jet... | ||
| Triman023 |
What setting should the needle clip be at? | ||
| Ratbuell |
man...I'd have to take one of mine apart to be sure, but I want to say I run mine third slot from the top. My bikes won't be any help though...as they're all Thunderstorm bikes. I converted my S2 years ago to T-storm heads, X1 cams, S1W race ignition, and thunderstorm pistons. I run it, with a stock muffler, at 45/190, 2.5 turns out, and it's happy but I may pull it back to a 185, it seems to load up just a *little* bit now that I have a stock muffler on it (used to run a Supertrapp). I run the same jetting in my M2L with Buell race kit. The S1W with full race kit is happier with a 48 slow. | ||
| Triman023 |
Thanks Rat I also switched to the Thunderstorm heads. When I opened the carb up the clip was 3 up from the bottom. I bumped it up a slot, will see how it runs. | ||
| Reducati |
Not to hijack the thread, but i recently bought a S2, with thunderstorm heads, 1250 kit, Mikuni carb. It was tuned for 5500 feet elevation..im 500 feet above sea level...do you think i need to rejet? She seems to run fine, a little pinging upon load. Can it the a/v just be adjusted, or do i need to change the jets? thanks! | ||
| Ratbuell |
Try the adjustment first...do you even know what jets are in it? 5000 feet is a big change. | ||
| Reducati |
No, dont know the jets, but ill try the adjustments. thanks Rat! | ||
| Cyclonecharlie |
Triman, Stock needle doesn't use clips....you need to see what needle you have and ,or go back to stock needle | ||
| Triman023 |
"Stock needle doesn't use clips" UH OH... Looks like its coming off again... Must have been set up for straight pipes. | ||
| Triman023 |
Pulled the carb and looked at the needle. It has a non linear taper and slots with a clip. Very much not stock. I also have the remnants of a Dynojet kit, in that kit I have my original needle and emulsion tube. The needle is a N86P This was for a 96 Sportster 1200. Appears to be quite lean. I am going to try using the needle in my carb and raise the clip. Any thought on using the N86P? | ||
| Someday |
Do a search for "Yost Power Tube", it's a different atomizer and needle combo that turned my S3 into a new bike. Had it in for over 10 years and is still running flawless. | ||
| Triman023 |
More research The stock needle is a 27279-93 or N86J No longer available from Harley The needle I have is un numbered but might be a Dynojet needle for an S1 I am going to try it with the clip on the 3rd slot from the top. Will call some carb suppliers tomorrow and see what needles I can get. | ||
| Sportyeric |
The needle with clips means either a Dynojet kit or a Yost Power tube. I have the latter in my Sportster. IIRC, it takes a different thread of jets than the stock tube. Also, the main jet size didn't compare straight across. As in a 180 jet in a Yost would give a different result than a 180 jet in a stock emulsifier. Keep in mind that the stock set-up was for emissions, not run-ability, and was much too lean for good running. | ||
| Triman023 |
Took yet another look at the main jet and found it to be a 195. I found a spare 185 and screwed that in. Will put it back on and give it a whirl. | ||
| Triman023 |
OK took her for a spin and its better, still feels like it might be on the rich side but better. Easier to start too. Looks like I may have to buy the Dynojet kit for the S2 and drop the main jet to a 175 | ||
| Littlebuggles |
My Y2K M2 (Thunderstorm) came with the slow jet as a 42, or maybe it was a 43... I forget, but the 45 jet was definitely smoother with aftermarket intake and exhaust. Follow Rat's suggestion and drop that one down to a lower size like the 42. | ||
| Triman023 |
Tried to remove the slow jet and found it stuck. Am going to try adjusting the idle screw back to 1 3/4 turns and see if that helps. | ||
| Griffo |
Try finding a guy on ebay , Killer Carbs , not sure if he's still on there I lost the link , he's in the US , tell him what you have done to your bike and send him the old carb , he'll knock you up a super duper newie with custom cap ,replaces all the bolts with little allen bolts and dips the carbie to clean all the litte tunnels etc in there completely , the inside gets done like a port and polish heavier spring on the slide , he did one for my M2 for 165 bux for the exchange , went like a rocket and started first time every time for the 3 years I owned it , he really knows his stuff .} | ||
| Triman023 |
Got a Mikuni and had a mechanic tune it. Bike now runs like a champ. Just got back from a 500 mile run. Absolutely flawless performance. The CV carb may be OK but the one I had was not going to work. Nice to have my Buell back. | ||
| Jayvee |
Here's the Killer ebay store: stores.ebay.com/Killer-Motorcycle-Products |
