| Author | Message | ||
     Hotbuell |
recently purchased a 1000 mile S2 time capsule, and although it ran ok on a short test tide, it overheats, knocks, pings, and loses power on a longer ride. I have only ridden it three times, and parked it. It is an early model, #70 off the line, and is CA spec (leaner jetting, different carb, timing spec I think). Has the 6R plugs in it, and a V&H muffler that installed as soon as I got it, and may have made the already lean jetting too lean? I have purchased new intake manifold seals but haven't put them in yet. Any advice to help get it sorted would be appreciated. thanks | ||
| Ebutch |
Timing Off? carb lean? You Must Buy Shop and Parts manuals!  | ||
| Hotbuell |
that would be a good place to start wouldn't it!!?? If this is not a common problem, perhaps my timing is off. Doubt the jetting has been touched. | ||
| Buellistic |
Intake manifold seals ... Incorrect timing .... And what ever you find ??? | ||
| 96s2t |
Was pinging/overheating a common problem for the S2's in California? Is there an unauthourized "FIX" for the California models with the different (lean) carb? | ||
| Leftcoastal |
Get rid of that "junksilver" carb for starters- they are virtually untunable unless you are one of the 3 people on the planet that seem be able to make them work. The quicksilver on my wife's S2T seemed to spew fuel back into the air cleaner and it almost burned the bike down when it caught fire once. Get a stock CV carb, find out what jets others at your altitude and pipe are using, and put your new seals to work on that. I put one on the S2T and all problems solved. (Well, other than the spousal unit tossing the bike into the weeds a couple times.) They are a good all-around carb. If you want more response and performance, go with a Mikuni 42. Pricey, but excellent units. The only valid reason that I can see for that silly quicksilver carb was to get it to pass the CARB regulations. That is part of the reason your bike is running so lean - that's how they passed. If they were great carbs, you'd see them on bikes everywhere. You don't. That's my opinion, please don't flame me for it, and if you are one of those 3 mentioned above, help Andy out here, OK? | ||
| Buellistic |
The Keihin CV40 is hard to beat as it gives the best of both worlds if jetted and PRODUCT IMPROVED correctly ... | ||
| Ratbuell |
I'm chasing a hot-ping on mine as well. Off-idle ping like leaving a stop sign, then it smooths out in the midrange, then the power just goes kinda flat up top. I'm actually going to check my VOES first, before drilling out my timing cover rivets (to be replaced with 1/4-20 screws...). But that could be something to check as well. | ||
| Blake |
S2 has not much power up top. It's a stock Sportster engine with a good exhaust system. Pinging is due to lean condition or ignition timing too advanced. Lean may well be due to new muffler, lean carburetor setup/jetting, or intake manifold seal air leak. All are easily remedied. Timing too, if that is too advanced. Question: How do you know the engine is over-heating? Frankly, I don't think it can. It's air-cooled. The hotter it gets the more effective its cooling system becomes. an engine doesn't need to overheat in order to ping, just get to normal operating temperatures and suffer overly lean fuel mixture, or ignition timing too advanced. One other possible source or factor in pre-detonation is excessive carbon deposits inside the combustion chamber. They can raise compression while also creating localized hot spots. Some folks swear by the combustion chamber cleaner called "Sea Foam.".I've never used it myself. Probable best to change the oil afterwards. Let us know what you find. Good luck! | ||
| S2pengy |
Loose wires on VOES is common I have had it happen on both of mine... Keep in mind the timing instructions are very different between the 2 ignition units (7 pin plug 1995 units and 8 pin plug on the 1996 units) | ||
| Richsm2 |
put the new colder plug in, then go from there. | ||
| Ratbuell |
Pengy - good point. I have a thunderstorm top end, X1 cams....and a '98 S1W ignition box with a Drag Specialties adaptor pigtail. Been that way for years, but maybe it took this long to get angry. I'll re-time based on the 98 settings... Sorry to hijack - I'll post any findings I end up with! | ||
| Hotbuell |
thanks for the suggestions. now for a little garage time. | ||
| 96s2t |
+1 on the seafoam fuel additive. I use it in all my bikes on the last tank of fuel before the winter storage. I also use it as a octane boost in the desert. Seafoam fuel additive is hard to get here in Canada so I pick a few cans up in the USA. | ||
| Fahren |
You must also change the 6R plugs for 10's. This was a Buell update bulletin - throw away the 6's. This isn't the overall fix, but you really have to do it, anyway. | ||
| Buellistic |
The 6's will work just fine if you richen the fuel mixture ... If your engine is that lean cold plugs is one of the answers ... | ||
| Fahren |
Lafayette, I just sent you an email. -Chris | ||
| Triman023 |
My S2 also has the Edelbrock carb. I chose to sent it in to Edelbrock and have it rebuilt. Have done this twice in about ten years, the carb runs fine. Switching to a CV is also a good option. The original carbs wore out quickly and caused lots of problems. | ||
| 96s2t |
I have the original carb on my 60,000 mile S2T and have no problems. There where no problems with the original carbs at all except the aftermarket companies telling you there was. | ||
| Hotbuell |
ok, we are making some progress. Installed 10R plugs, increased pilot to 45 and main to 190, and replaced the intake manifold seal at the carb, and no detonation until the very end of a sixty mile ride. I thought I had it licked until pulling away from an uphill stop sign a few hundred yards from the house! I am going to try a 48 main, and will buy a timing light and check my timing. (now that I have the shop manual) | ||
| 96s2t |
Detonation all the time at the end of your 60 mile run or just from a standing stop or just when opening the throttle up over 1/2 open at speed? Check the plugs. P.S. How was the ride?? | ||
| Hotbuell |
just at the end of the ride, from a dead stop, low revs, high load pulling away from an uphill stop sign. Severe, but avoided with some revs and a little clutch slip. VOES? | ||
| 96s2t |
Andy, Did you check the timing yet? Is it the stock module still? | ||
| Hotbuell |
I ordered a clear acrylic plug on ebay, so will be able to check this week when it arrives. | ||
| Hotbuell |
ok, found some time to get back to my little project. Ignition timing is right on. V.O.E.S. works correctly. It runs fine until is gets hot, so something about the getting hot is the problem. Beginning to suspect the intake manifold seals may leak only when hot. Going to change them and rejet pilot from a 45 to a 48. | ||
| 96s2t |
Manifold gets hot and expands the seals and lets extra air in and you run lean. Any luck on finding the S.E. ignition module? | ||
| Hotbuell |
ok, bike is going back together. i notice the manual does not reference any sealant on the manifold seals, but there is residue of some kind of sealant or grease from the factory. dry - rubber on aluminum, or wet with grease or gasket sealer? | ||
| Firemanjim |
We use product called Sil-Glyde, works really well. | ||
| Hotbuell |
thanks | ||
| 96s2t |
Sounds like a light silicone grease. | ||
| Bluzm2 |
You can get Sil-Glyde at NAPA. Worth every cent. | ||
| Hotbuell |
I works! No pre-ignition! I almost can't believe it, but 48 pilot and/or new intake manifold seals seem to have cured my woes. Thanks for all the great advice. | ||
| 96s2t |
Perfect. Now I can sleep at night. Enjoy the ride. |
