here's a carb question for you...?

[jasonm.]

put 230 miles on the new spark plugs. Only #3 shows any sign of color compared to the others that are staying white as snow. Mileage...well it's nothing to rave about. Lucky if I see 36 on the hiway. I can't help but twist the throttle to WFO. Power corrupts. Also, I removed MY Jason MOD to confirm the how the plugs are "burning". Maybe w/ the MOD it will go up 2 mpg. I invented it and have had it on for almost 20 years. Now with it off...maybe it's suspect of my lesser mpgs than I remember. I may be able to dyno the bike tomorrow. If it passes my expectations. I will not do a damn thing more. Last time it had 93.2 hp. The way it runs now(rocket like- roll ons) and also sucking more fuel than I remember it should , may mean something. Oh did I mention, at far less than 1/2 throttle it's cruising @100+...?

[GeorgeS]

Well try drivieing it around like an old guy!!! ( you know what I mean ) for one tank of fuel.

 

I know it won't be easy to do that, but, take some nice scenic back roads, enjoy the sceinery. I bet you do about 42

[jasonm.]

Well try drivieing it around like an old guy!!! ( you know what I mean ) for one tank of fuel.

 

I know it won't be easy to do that, but, take some nice scenic back roads, enjoy the sceinery. I bet you do about 42

 

I have been doing hiway to put miles on and check the spark plugs' color. When I did go back roads...I got 41 the 1st time on the back roads 60mph avg. w/my MOD connected. Yes, I did twist it once or twice to pass the people who are afraid of the wind. I have had this bike since '89. It was never like this(super powerful, instant responsive and hard to hit 40mpg)...I am sure. Did I have a carb issue form the 1st day I owned it? If so, How did I get 93hp out of it. Wish there was another 1st gen. Venture rider close by. Who's had his as long as me. I may have been a bit over stating the throttle before. It's more like 1/4 throttle.

[Condor]

Just curious Jason. I run your mod on the '83 and find it has a little more lope at idle...which I kinda like..., but I really don't notice any difference in performance or gas milage between stock and the mod. I ran the mod from Sacramento to Ft Collins[1039 miles] and got 38 mpg. Took it off before the trip home[1200 miles] and it still got 38mpg. Now here's the question. Have or has anyone connected the vacumes between 2 and 4, and 1 and 3, and if so, what was the result???

Edited May 19, 2009 by Condor

[jasonm.]

the main reason for the mod. is rather simple when comparing intake and exhaust tuning. Maybe you are aware that inline 4 cyl. bikes exhaust works best when 1 is connected to 4 and likewise 2 connected to 3 prior to dumping to the collector or muffler. This is due to the firing order. Allows even pulses. Now the same is also true for the intake. But with a V-4 the benefits vary. So lookng at the manual(there are misprints). You want 1 to 2 and 3 to 4. I do not know of anyone doing as Condor suggests. - I will say it will makes less difference on the bikes w/YICS.

- Also I had a revelation tonight. My increased performance may be simply due to my replacement BOOST Sensor. Now the lesser mileage could be a couple of things I am still investigating. Like lack of full advance , remember used-new boost snsr.

-And my lasted pain is my water pump seal. I replaced it using the old impeller,that was a Big mistake...So I replaced the seals again using a new impeller and used my Yamaha W-P special tools and I followed the book(my memory sucks) "to a T" as always. All good but on another thread I mentioned the knocking noise from the pump area. To figure out the noise, I drained the coolant,I took off the impeller cover. Started the engine and ran for a total of 20 seconds...maybe. Then not being satisfied I removed the water pump to inspect things. Not wanting to damage the oil or mech. seals I did not remove the impeller. Now tonight's ride, When hot I had a couple drops of coolant come out. Now the seal may be failed due to my short 20 seconds. Smart me> Last seal change I had installed a clear hose that fits perfectly in the weep hole using a bit of hi-temp RTV. I can see anything that comes out through this hose. I saw coolant and enough got to the exhaust pipe where the hose is just an inch away which I could smell for a split second. Which is a good warning. The hose also protects the cases and bike in general from getting messy from a bad W-P seal. My original seal lasted 65k. So you see how this is pissing me off. I am such a putz sometimes. I think the dealer loves to see me. My baby always has something wrong. Sorry for the long windedness...

Edited May 20, 2009 by jasonm.