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General Category >> Rubber Side Down! >> On a positive note!!!
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Message started by DocNeedles on 08/03/08 at 16:44:50

Title: On a positive note!!!
Post by DocNeedles on 08/03/08 at 16:44:50

Hopefully you remember my ongoing problem with unburnt gas coming from my exhaust. All of your feedback has been helpful and this is what i have done. I only run on "Prime" and turn it off when I shut the bike down. This helped dramatically but I still had some unburnt hydrocarbons. Someone suggested that going to a higher octane might help a 90 or 91. I did this with a 90 octane (possibly with some ethanol) using a NGK DPR8EA plug and the bike was riding better. I took out the plug after a month and a half and the electrode was a health tan colour and not the black that I was used to. I have just changed the plug to a hotter NGKDPR7EA since I am riding on a small island and only in a few places can I get into 4th gear (1986 vintage).
I rode over to our next island where they have 91 octane to try that and put 9.8 litres into the tank. Since I believe the Savage tank takes 9.5 litres plus some for the reserve I must have been sucking air as I got to the station. Driving away to catch the ferry I noticed it was running like it used to (I did use 86 Octane gas from my own island pump cause I needed gas to get to the next island and I can understand that possibley the dregs of the tank where running throught the carb.) That rough running is hard to describe it sounds like"PLUUT, PLUUT" I also noticed that when I started it up in the morning it spewed more unburnt hydrocarbons but not as much as it used to. Today I took it for a run and it was running fabulous!! It's sound was like a octave higher and going "PLET, PLET". (Sorry for the weird sound affects.) So somehow I think part of the problem has been the quality of gas I have been using.
I have noticed though when in 4th gear and cranking it open I hit a point where it feels like it has changed into 5th gear with a power surge. Can this be because of the UFO on the new carb that I installed that I got from Lancer?
Also is there any problem in running 90 octane? It seems to prefer it and does not seem to overheat.
DocNeedles

Title: Re: On a positive note!!!
Post by verslagen1 on 08/06/08 at 07:33:09

If it works for you, use it. But the thing to watch out for are carbon deposits on top of your piston. I guess there's not much you can actually watch, but in a overheating situation it may diesel.

I'm thinking that the hotter plug may partially fixed the issue. You might drain off that sweet off island gas and put the dingy local stuff in as a test. And I'd also consider a fill up with off island low octane stuff to further test weather it's the gas or the station. My guess it's the station.