Sunday: Just a little hesitation from idle to WOT, but all go from 3K (pre-engagement) to WOT. Ran like a charm. Parked it (inside heated garage) and didn't touch a thing.
Wednesday: Added fuel (bought no earlier than two months ago - premium - know now that premium isn't a big deal, but didn't then) and now real skippy/lurchy when cruising between about 6-7k, all there at first from 7k to WOT (peak rpm about 10,400) but after 5-6 seconds at WOT, rpms back-slid to about 8,800-9k. On a pretty good track but probably only about 1000 ft runs (river), D-O-M never registered more than high 80's, but I don't think I'd have gotten much more out of it even if I'd had more room. Regulary checked and emptied evac.
The fuel is the obvious first look, but don't know why I'd have good running at some points in the rpm band and not others if that was the culprit. Filter freeze up not the culprit as it had been in the garage for three days and the problem was with me from the very go Wednesday. Any help is greatly appreciated.
Wednesday: Added fuel (bought no earlier than two months ago - premium - know now that premium isn't a big deal, but didn't then) and now real skippy/lurchy when cruising between about 6-7k, all there at first from 7k to WOT (peak rpm about 10,400) but after 5-6 seconds at WOT, rpms back-slid to about 8,800-9k. On a pretty good track but probably only about 1000 ft runs (river), D-O-M never registered more than high 80's, but I don't think I'd have gotten much more out of it even if I'd had more room. Regulary checked and emptied evac.
The fuel is the obvious first look, but don't know why I'd have good running at some points in the rpm band and not others if that was the culprit. Filter freeze up not the culprit as it had been in the garage for three days and the problem was with me from the very go Wednesday. Any help is greatly appreciated.
LazyBastard
TY 4 Stroke God
- Joined
- Apr 13, 2003
- Messages
- 5,276
- Reaction score
- 5
- Points
- 1,216
Clean your carbs, make sure your choke is off (check at the carbs), change the plugs.
Again? I was afraid someone was going to say that. Changed the mains as part of the ecp a few weeks back. Had it apart again last week (before she ran like a banshi Sunday) to adjust the fuel screws and clean the pilots (read the schematic wrong and actually cleaned the starters 
way too many jets in there). I suppose..... I'm baffled, though, what could have gone hay-wire in three short days and 0.0 hours of operation? The only thing was the gas, and to my mechanically-challenged way of thinking, those problems don't seem symptomatic of bad gas.
way too many jets in there). I suppose..... I'm baffled, though, what could have gone hay-wire in three short days and 0.0 hours of operation? The only thing was the gas, and to my mechanically-challenged way of thinking, those problems don't seem symptomatic of bad gas.
BVER FEVER
Expert
- Joined
- Apr 21, 2004
- Messages
- 310
- Reaction score
- 0
- Points
- 591
- Location
- MOSQUITO CAPITAL OF THE NORTH EH?
So let me get this right, you took a perfectly good running sled which was low on fuel out of the cold & into a heated shop? Thats a BIG NO NO. Condensation will form inside that fuel tank and if you didn't add any alcohol (to the sled not to yourself 
) you will have water in your fuel. I would start there and try again. 
) you will have water in your fuel. I would start there and try again. Guilty as charged - will start with a little alcohol. Thanks
LazyBastard
TY 4 Stroke God
- Joined
- Apr 13, 2003
- Messages
- 5,276
- Reaction score
- 5
- Points
- 1,216
Be careful not to mix up the people and sled types of alcohol. People alcohol causes sleds to sieze, sled alcohol makes people blind, dead, or in the worst case, impotent.
:shock: Crap, that 'splains what happened last night when the sled suddenly stopped running and nothing worked right when I accidently tried to hump the dog.
LB, I'm a motor-moron, but even I knew that. But, thanks for looking out for us newbies
LB, I'm a motor-moron, but even I knew that. But, thanks for looking out for us newbies
The isopropyl took care of the 6-7k skippiness, thanks much BVER. But I still have the problem when pinning - 4k to 10.4k and then backslide to 8.8k, and peak mph at upper 80's. But, when I eased up to it or toggled around I could do near 100mph (didn't think to look at rpm) and had some throttle left. Carbs or clutching?
LazyBastard
TY 4 Stroke God
- Joined
- Apr 13, 2003
- Messages
- 5,276
- Reaction score
- 5
- Points
- 1,216
Could be either or both. I would check the color of the plugs to be sure that there isn't still something going nasty with the carbs.
Also... make sure that you think to check the tach - that is really important when trying to figure stuff like this out.
Also... make sure that you think to check the tach - that is really important when trying to figure stuff like this out.
