So barring any screwy efficiency numbers, I think it has significantly improved. It does not act like it wants to accelerate any more if I try rolling off the throttle once it reaches max speed. It does pop a little on decel but much more tolerable than it was. I'm much less concerned with the backfires on decel and shutdown than I am with drivability. Now I don't get stuck in the wind bubbles while getting around big trucks. The pvc elbow moved the air filter to a spot where for whatever reason it is no longer trying to deafen me lol. When I had it directly on the carb it was obnoxiously loud. The engine does not sound as labored at higher speeds. It now gets up to highway speed pretty dang fast... almost as fast as I can roll the throttle!

Thank you fellas for offering up your experience and expertise. I was getting close to throwing in the towel and just selling it lol. Would you believe I have had 2 offers of 5k$ for it in the past 2 weeks!? Being in the situation I was in... The offers were pretty dang tempting. I am glad I held out l though.

If all goes well, I will get my YZF600 out of the shop in the next couple days so my better half and I can go ride again. She has not been on a bike since the day the 1st wiseco piston failed. She has been binge watching moto-vloggers in lieu of getting on the bike.

I have a brand spankin` new set of Shenko something or other paid for and waiting on me to pick up when I go get the YZF. In addition to the fresh set of sneeks, this bike will get an overbuilt aluminum diamond plate battery box... And that's it. I'm calling this build complete. It's comfortable, fun to ride, aesthetically pleasing to look at (to me anyway lol), and super easy to work on with all the extra junk out of the way. It turns heads, and confuses people regularly! I love the questions on peoples' faces when they realize it is not a sportster lol!

Christof13T wrote on 02/15/18 at 04:18:29:
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Unbelievable! More unbelievable is that you didn't take the money and run!!

Call them back and sell it..
You can buy another good used one and play with it and still have money left over.
This is the perfect time to buy before it really starts to warm up.

LANCER wrote on 02/15/18 at 12:27:05:


They were both just random dudes. One at the gas pump, and one on my way into little caeser's to grab lunch. I guess I just wasn't gifted with that salesman reflex. My first thoughts were that I just put so much time into it, and it's not even broken in yet! Lol.

Ok, the carb rebuild kit came in yesterday morning. I picked it up from the post office on the way out of town and was almost salivating to get it all swapped out when I got home.

The rebuild kit came with a 130 main jet, and I wanna say a 45.5 pilot. It also came with a replacement jet for the top side (the smaller one) and new needle jet and needle. The needle it came with has the 3 position undercuts for the e clip. I set it to the middle slot with 1 shim under the clip.

The idle now sounds lopey like a cam'd up sb 350. It hesitates and wants to stall if I give it a bump of throttle from idle... but will climb the revs if I start to roll on it very gently. It is ballsy as all get out in 1st... most of 2nd, then falls on its face 1/3rd or so into the throttle.

I'm going to try going back to the pilot I previously had in it, leave the 130 main jet, and put the stock Jett I replaced back in the top side.

On the plus side, the fresh float valve and seat have cured the fuel puking issue...

Finally got her new sneaks on yesterday. Our plans to actually go ride were kinda shot to hell tho. The shop was crazy busy so they did not get my tires mounted until right before 5pm. I was mistsken... they are not Shenko something or other. .. they are Dunlop something or other lol.

I attempted to dismount the old ones myself here at the house and promptly learned I had bitten off way more than I could chew with my spoons. I probably could have gotten them off the rims but not without causing serious damage. I suppose it was worth the 90$ extra for dismount, mount, balance at the stealership.

I'm still confused as to weather at this point it would like a leaner, or richer mix to play nicer at 70+mph.  I have the 52.5 pilot and 145 main jet in it now with the e clip on the slide needle in the middle position with 2 spacer shims under it.  I hope to see that efficiency has improved after today's ride to Rockport and back.

I honestly only spent the 25$ or so for the full rebuild kit for the brand new float valve and seat. It has cured the vent puke problem so far.  I guess I could have just found and ordered the valve and seat by themselves but figured wth... if nothing else I will have more spares of everything else.

The ride down to rockport this morning was borderline miserable.  Visibility was at about 100 yes due to fog. The fog droplets were dang near as big as rain droplets lol. The better half was a bit nerve rattled in the weather so we putted along between 55-60mph most of the trip. She did start getting comfortable about 15 miles out as the sun started peeking and rolled into it up to 70mph a few times. I will update again when we fill up for the ride home with efficiency numbers from this morning's ride.

Chris ,E clip on the needle? Are you running a needle other than stock ? Was that a part of the Sigma kit? Or are you running a 86/87 carb? If your bike is newer than 95 and you been mixing parts from the old and new style carbs your in big trouble ,these are two different animals.