Re-jet went south!

centuryghost · November 05, 2009, 09:52:41 AM

Hi everybody! This is my first post here, but I've been reading and dealing with Buddha for awhile.

So, I decided to re-jet to 125/40 and I had one of my pilots stripped by the po. Long story short, I got it out but fudged the threads in the carb body a bit. I decided to just screw the new one in and see what happens. It's in but doesn't screw all the way in. I used a depth gauge and its about an 1/8th in. higher than the other pilot. What kind of issues should I expect from that? I haven't hooked the carbs up yet, not till the weekend. Anyone have this issue? Will it effect performance? Should I get a new carb body?

Thanks!

The Buddha · November 05, 2009, 10:26:59 AM

OK why dont you put a tap in that - what I believe is called a finishing tap not a starting tap and tap the threads.
1/8th inch lower pilot may be of no consequence though. Its the diameter that makes a difference ... but clean the threads and try it.
Cool.
Buddha.

centuryghost · November 05, 2009, 10:31:31 AM

Yeah, hindsight 20/20...
Well, my friend the master moto mechanic

suggested we put some locktight on the threads. His figuring was that it would thread loosely. It didn't.

The Buddha · November 05, 2009, 11:03:58 AM

OK does it have locktite now ?
I'd really not do that, loctite may come loose with gas and nicely get into the orifice ... then you cannot remove the dabling thing either.
Cool.
Buddha.

centuryghost · November 05, 2009, 11:13:00 AM

Yep it does

centuryghost · November 05, 2009, 02:35:02 PM

I'm kinda stuck with it the way it is. I'll hook it up this weekend and keep my fingers crossed. I was just wondering if anyone has knowledge of a similar situation were the pilots are not the same depth in relation to each other.

centuryghost · November 09, 2009, 10:02:12 AM

Update:

It works frickin' awesome! Apparently it doesn't matter if the pilots are a little off in relation to each other. I'm going to keep my eye on the plugs for rich/lean conditions, but for now I truly understand what "linear power curve" means!

The Buddha · November 09, 2009, 10:11:29 AM

Ah well such are the crazies in this site that I learn stuff every day ...

And last year my friend lopee had a carb chassis that had the air mix screw driven in deeper in one body than the other one.
That made for some fun tweaking and apparently the one where its crammed in further needs fewer turns to burn the same color in the plug as the other one ... I'd have thought it needs more ... But of course a crammed in one opens up the diameter of the pipe its crammed in. and ergo, fewer turns cos its already capable of flowing more.

I have also encountered a carb set I could not clean my way out of yet (of course it seems to have mud, fine river silt mud) in it. All in all interesting stuff. I will try hot water and ethanol based cleaners in it next ... but its definetly funny.

Cool.
Buddha.

centuryghost · November 09, 2009, 10:37:21 AM

Yeah, what I would expect is the plugs may age differently. I figure I'll keep a lookout and see if I have to tweek the mixture a bit on that side. But so far so good!

The Buddha · November 09, 2009, 11:57:04 AM

It will be more perceptible at take off ... pilots yea affect idle mix, however they really come in and control the way it is jetted as you take off from a stop.
I had a bike with 42.5 pilots. Just 1 size up mind you, and it woould stall and die unless you had 4500 on the tach and let the clutch out so slowly ... and never let it drop under 3 under load. The difference between 1 size off and exact in the pilot range is huge. 2.5 is nearly 7% of 40. Huge. But 2.5 is under 2% of a 125 main jet.
Anyway I'd test put a few take off's. Then call it done and congradulate yourself.

Cool.
Buddha.

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Re-jet went south!