jetting

I had to replace an '81 BS34 needle valve and seat that hung open on a ledge worn into it. I naively assumed the new would measure the same as the old, so I didn't check the float level. Fired it up and tons of black smoke out that side. Looked at the float and it was set to float a couple of...

I had a #137.5 on there before with a #45 pilot jet and needles 1 notch up from the bottom. Today I put a #140 on there along with new manifold gaskets. Holy crap. The bike was pretty strong off idle before but got anemic with throttle. The thing now just screams. It is much much faster...

I've read a lot of posts and still not sure where I need to go. I have a '73 TX650 all original except for K & N Pods and a shorty open muffler. I live at sea level in Southern California. The Bike starts and runs for a while, but pops pretty bad then dies. If you give it any throttle it...

This is the best PILOT jetting solution I've come across for my '79 Special with: XS Performance Stainless Steel Headpipes - 1.75" (45mm.) OD XS Performance Reverse Cone Megaphone Mufflers XS Performance torque inserts XS Performance pod filters The advice: "These carbs are *really* easy to...

ok heres the deal i got my bike runing and i have bs34 on the bike and one side is runing colder than the other.i tried syncing the carbs and one side of the tool u could see a mist in he tube on the carb that seemed to runing good and on the side that was runing colder u coulding see the mist...

hi, i have a 79 (sf) 650 special with 38 carbs. the pilot jets have no bleed holes and have 275 stamped on them. i was just wondering if these were the right pilot jets as i have seen similar ones with bleed holes why do some jets have no holes and others bleed holes and does it make any...

This XS650 I have is a frankenstein.. The engine is a 1975, the carbs are from a 1976 standard, the frame was a '77 but I swapped in a titled 79 special frame since it had a title... Anyway, I'm wishing to upjet these '76er carbs with a good guess at the jets. I'll be running some sort of...

I'm at my wits end with my engine! :banghead: I have a 1982 XS650 with BS34 carbs. I rebuilt the engine early last year (Jan 2009), but could never get it to run correctly, so it sat in my garage for a whole year. After I rebuilt the engine I couldn't get it started, so I rechecked the...

getting ready to rebuild and rejet the carbs, doing the pod intake free flowing pipes (stockers hacked before the muffler with turnout tips) bike is a 1980 with bs34's where is a good start for the jetting, links for rebuild kit and jets are very helpful

i'm pretty sure i'm going to have to go up several sizes in the jets, but i don't feel like getting 5 different ones just to find out i'm still way out. the engine's been bored to 750 (or 780 actually, if you believe wiseco's datasheet), will have xs performance pods and a relatively free...

I heard you have to change the jets, when you replace the original air box with the pod type air filters. If yes, suggestions please. I'll probably just get carb rebuild kit. I've seen a few different kits, anybody have a favorite? Oh yeah, they're stock 78' carbs.

Greetings all and Happy Crimbo for tomoz. I found this piece of metal clinging to the oil drain plug. Questions. 1.what is it and, 2.what does it do and, 3.will it be expensive. The prize is - street cred for anwsering all three questions. Engine is now out and going off what I've...