carbs

Hi guys, I noticed my 78 XS400 is painfully unresponsive to the throttle and struggles to push any speed beyond 60km/h. My buddy who drove the bike back for me when I bought it told me that it for sure needs a carb clean. I want to pull the carb and see how much some shops will charge since...

Hello all I recently began my journey into a a 78'/82' Yamastein! I have ran into a situation where I need some clarity. This is my first motorcycle project that I have basically had to start from scratch so my knowledge on these things is maybe not up to par. From what I can tell from the...

Haha! New owner of a 84 maxim. Looking to work my carbs for the first time this fall, wondering if anyone else wants to work on thiers together?

Hi dudesters, so im thinking about getting this old bike running, and got around to doing the carbs after a short span of inactivity (the thing has been dismantled for 7 years give or take). So to my surprise i found both idle jets were jammed in too far, subsecuently got stuck and the tips of...

Hello everyone, haven't been here in a while because I haven't really putzed around with my XS400 for a few years. I've got a '78 XS400-2E that I had running exquisitely back in 2016 until I started having electrical issues - basically the original mechanical voltage regulator was fighting me...

This is my first bike guys and I’m really excited to start getting things working. I’m planning on taking my time and doing a restoration with it over the winter. Bought it from previous owner who let it sit with it on, and gas in the tanks. It won’t start and im pretty sure I just need to...

Hi all, not sure what to do about this one. Just took my 82 out and took it on the highway for the first time going between 50-75 for about 10 minutes. Once I come back into town, at every stop it wants to die and frequently sounds like the left cylinder is cutting out. Furthermore while riding...

Hi, need some advice for getting my bike running right. It’s an xs400se The main issue right now is the rev hang it has on idle. And occasionally won’t idle will just stall, or when idling and going to throttle it cuts out. On warmer days it will idle but have rev hang. Guessing it’s running...

So this has been a year and a half worth of trying to figure out what is wrong with my bike. I bought this fully running about 3 years ago I think, and rode it around with no problems for about a year and a half. Here's my problem now: My idle will bounce around a bit and "searches." After...

Hello everyone. First post! I've done a bit of searching, but have a couple of questions about some carbs I've just bought - as I have a bit of time to wait for them to arrive, and was hoping to get some other bits ordered whilst waiting. I've got a '79 250 frame, which I'm putting a '81 (14V...

Thanks to all who helped me on my previous thread! (Reassembling the engine - check it out here http://www.xs400.com/threads/kick-start-locked-up.16804/). Now that I've got the new crankshaft and rods in and the whole engine reassembled I'm trying to breathe life back into my 1980 XS400...

So first things first. I'm new to carburetors. I pulled the float bowls they're clean, but when I throttle to start the bike the floats, I think, they don't open with the butterfly valve. I can push them into the float bowl and they drop down at about the same speed more or less. Do they need...

It's the luck of working. A few weeks ago I took off all the panels to be spray painted, never touched the carbs (in fact I drained them) and now when everything is put together, the carbs are leaking out of every orifice. Not sure what to do, my petcock was also leaking no matter what, even...

Hello I have a 1981 xs400h. I recently rebuilt the carbs(mikuni bs34 cv) but i noticed i do not have any pilot jet plugs. The reason i rebuild the carbs was because the left carb was leaking gas to the left air filter. Do i need to buy pilot jet plugs? The right carb never leaked any gas...

hey! these forums have helped me do so much work on this bike over the past year or two and i had it running beautifully. but i recently moved to CA and brought the bike in the back of a moving truck. there was atleast one giant bump i hit where i thought everything in the back of the truck...

Hello all, and may I thank you for supporting such a wonderful and helpful site. Two weeks ago I bought a 1978 XS400 (2LO VIN) for $50. It had been sitting for 3 years, but had run when it was parked in a shed, or so the PO said. I brought it home and me and a friend sprayed some starting...

Tore my carbs apart and cleaned them thoroughly with carb cleaner. Set the timing to be fairly accurate and point gap is perfect. Valve clearances all within spec on the tighter side (quite quiet now, might have read my old posts on the valve train noise, has all but gone away now with valves in...

Hey, Changed my oil and adjusted valve clearances yesterday, now valves all within spec. Took a video before right cylinder intake valve was set properly. Didnt like the sound so went back over and checked all clearances. I just did a poor job on one of them (was .003 out! on an intake valve...

Off of a 1982 Yamaha XS400 Mikuni in good used condition. Everything moves freely and have been well cleaned. Asking $150 w/free shipping. Make payments via PayPal, Chase Quick Pay, or Venmo. US ONLY! Sorry!

Hey guys, so after getting my bike back from the shop two weeks ago, where it left running, it has decided not to start. When I attempt to start the bike with my electric start, if I have the clutch out or if I give the bike throttle, my electric starter hits a dead spot and sounds like it's...