| Author | Message | ||
     Tigermann |
I have a 1995 Buell Thunderbolt S2 with approximately 14k miles. When the bike was still new, the previous owner installed a Screamin’ Eagle Hi-Flo CV carb kit, Dynojet kit, Andrews N2 cams, stainless valves, “street” ported and polished the heads, a V&H SS2R exhaust and dyno tuned it. Problem with this setup is 1. The choke is on the SE carb body and almost impossible to reach, 2. The SE air cleaner is horizontal and I can’t use my S2T lowers, and 3. While it runs fine when warm, the first 2-3 minute warm-up is a nightmare of popping, backfiring, dying, etc. So I decided to go back to the stock 40mm CV carb and air cleaner setup. Got an OEM carb, manifold and cables from a “running” S2 on eBay, and a Hammer Performance backing plate/air cleaner and breather bypass kit. I installed the manifold with new flanges, bolts and gaskets, fit and torqued correctly. Carefully cleaned the carb, checked the diaphragm for holes or tears, made sure the float level was to spec, blew out all the passages, replaced the broken plastic fuel inlet with a brass unit, added a new choke cable – all this per manuals or videos. I installed the carb, fuel line, vent line from VOS, choke cable and throttle/idle cables (mounted breather kit but left the air cleaner off). Turned on the fuel, waited a minute, pulled the choke, and hit the start. She fired right up – no popping or backfiring, just as I hoped. But then fuel started dumping out the carb overflow. I shut down, cleaned up the mess, lightly tapped on the bowl, and tried again. This time the overflow stopped, and it started right up again. But after a minute of warm up, if I released the choke or touched the throttle the motor would just die – like it only got fuel with the choke pulled out. Repeated starts had same results. Any clues what to check? | ||
| 651lance |
Sounds like you idle air mixture screw is set wrong or your low end jet is plugged or two small, it should be a 45 jet. | ||
| Johnod |
Might find some info here, plus if you need any parts they're good. I put in a tuner kit, and a couple of other parts, made a big difference http://cv-performance.com/ | ||
| Ratbuell |
Could also be an intake leak. Did you a) replace the boot the carb sits in and b) lube it with a bit of oil so the carb slid in cleanly? A good starting point would be 45/190 jets with the mix screw 2.5 turns out. | ||
| Tigermann |
Thanks guys, Yes Ratbuell, I replaced the boot and lubed it, so pretty sure its not an intake leak. OK, so I'll check the jets and mix screw (I didn't bother originally as the carb supposedly came off a running bike). If that doesn't do it, I'll move on to the CV-Performace kit. |
