Fullmetal
XS400 Enthusiast
Hey guys, I've been trying everything to get the carbs on my xs360 running right. The bike was running too rich no matter what I did, especially in the low and mid range. I did a bit of digging, and I found some talks on a honda forum (blasphemy!) about worn needle jets. They were saying over time, the orifice at the bottom of the jet wears away and becomes rather oblong, allowing excess fuel to drip into the circuit. ALL the symptoms they listed were what are plaguing my bike (drop in mpg, low end/midrange richness, start with no choke, fouled plugs).
Sure enough, I tore my carbs apart again and the jets had indeed lost their circular shape. I never noticed it before, or if I did, I didn't think it would have some a prominent effect. The manual on the site confirms that the needle/jets wear over time and should be replaced every so often.
But this is where my problem lies. Both the needle and the jet are discontinued by yamaha, and I can't find any trace of any NOS parts. My options are rather limited, but I've narrowed it down to 3 routes:
1) Watch eBay for a set of a xs360 bs34s, but who knows how long that can take.
2) Buy Mikuni needle/jets with similar specs and try to get the carbs tuned right with those.
3) Fork over the money for a set of Mikuni VM carbs.
Any advice would be appreciated. I'm truly at a wall here, and I'm sooo close to getting this bike back on the road!
Sure enough, I tore my carbs apart again and the jets had indeed lost their circular shape. I never noticed it before, or if I did, I didn't think it would have some a prominent effect. The manual on the site confirms that the needle/jets wear over time and should be replaced every so often.
But this is where my problem lies. Both the needle and the jet are discontinued by yamaha, and I can't find any trace of any NOS parts. My options are rather limited, but I've narrowed it down to 3 routes:
1) Watch eBay for a set of a xs360 bs34s, but who knows how long that can take.
2) Buy Mikuni needle/jets with similar specs and try to get the carbs tuned right with those.
3) Fork over the money for a set of Mikuni VM carbs.
Any advice would be appreciated. I'm truly at a wall here, and I'm sooo close to getting this bike back on the road!