pilot jet

[rlong74]

Hello,
While cleaning the carbs on my '81 450T i noticed the pilot jets are marked 22.5. My manual says stock was 17.5. I don't run pods and my exhaust is stock. Can anyone think why the PO may have done this? And will this increase fuel consumption?
Thanks for looking.
P.S.
I dipped 'em

[Guest]

It will increase fuel consumption.
Pull the spark plugs. Are they dark?

[GQROD]

PO's often do this thinking more gas means higher horsepower gains.

It doesn't unless paired with equal amounts of air flow ie: pods, free flow exhaust, cams etc.

[don_gibb6512]

Hello,
While cleaning the carbs on my '81 450T i noticed the pilot jets are marked 22.5. My manual says stock was 17.5. I don't run pods and my exhaust is stock. Can anyone think why the PO may have done this? And will this increase fuel consumption?
Thanks for looking.
P.S.
I dipped 'em

A step up in pilot jet size won't increase fuel consumption so much that it would be that noticeable.

You don't have pods but do you have a K&N air filter? How does the bike idle and run in the 1/8 - 1/4 throttle range? And as stated, are your plugs black and sooty or tan/brown? Does the bike bog just off idle or does it respond crisp and quick? Also check the turns on the pilot fuel/air screw. How many turns out?

If the bike is running good and the plugs are burning tan/brown, then leave it the way it is.

[chuckycheese]

carb kits....yuchhh

I suspect that it happens pretty often because someone uses a 'carb kit' that is either not the right one or one that contains parts for several different models.

[rphillips]

I'd think it was to make the bike start better. Some of these old GS's were very lean on the pilot circuit & were hard to start without a lot of choke, the larger pilots make them start much easier. the fuel consumption will be so slight, you would never know, even if you stayed at a Holiday INN Express last night. If the mains were 2 sizes larger than stock, you may notice, lower mpg.

[chuckycheese]

screwed up

I've bought bikes, twice, that didn't have all of the right jets....and they didn't run worth a damn until I put in the correct ones.

[rlong74]

A step up in pilot jet size won't increase fuel consumption so much that it would be that noticeable.

You don't have pods but do you have a K&N air filter? How does the bike idle and run in the 1/8 - 1/4 throttle range? And as stated, are your plugs black and sooty or tan/brown? Does the bike bog just off idle or does it respond crisp and quick? Also check the turns on the pilot fuel/air screw. How many turns out?

If the bike is running good and the plugs are burning tan/brown, then leave it the way it is.

I have a stock air filter.. The bike idles fine when cool but hangs when hot. It will come back down with just a light tap on the throttle or slowly sometimes on it's own.. It does respond crisp and quick. It is presently 1 1/2 turns on the screw and the plugs are the tan/brown color.
Thank you all for your input. Once again this site has proved invaluable.

[Steve]

... even if you stayed at a Holiday INN Express last night. ...

Gee, I wonder what that says about my qualifications?

I spent a whole MONTH there just a few weeks ago.

.