carb setup

I recently got a 1978 xs400 (non running). The guy I bought it from got new carbs (MikesXs Dual Carb setup) that he put on but never ran fuel lines to. I’ve been messing around with running fuel lines but just can’t seem to get it to flow correctly. I currently have the OEM petcock which I...

Hi All, I am based in the midlands and have a bit of a basket case xs250 1978 SE. I am wondering if anyone has any main jets at all please? I am after #125 main jets as I am running an aftermarket exhaust but with stock air filters. I could be wrong with this size if anyone has any experience...

I have a 1978 XS400E all original. The problem is that when the engine is hot, it will not idle down unless i use the brake. I can be cruising along and take my hand off the throttle and it will stay at speed until I brake. Then the engine will slow down. And often waiting at a stoplight it...

Hello all again, I have still been working over my recently acquired 1978 XS400E and thought I'd post an update on all the things I've done so far. 1. As in a previous post, I had a cracked head. I bought a used one off ebay, lapped in the valves, new valve guide seals and also decided to...

So, I got into the carbs on my ‘81 the other day and honestly the worst I’ve ever seen. Gonna be completely rebuilding them. I am having trouble locating floats for the ‘81. Will the ones from earlier models like 77-79 work? I uploaded some pics of what I got versus what I was looking at buying.

A few months ago I purchased a 1977 Yamaha xs360. The bike was in a very rough condition when I bought it so i spent these last months rebuilding nearly everything. I'm running stock-ish (not open) exhausts and the original carbs with pod filters. I replaced the #130 main jet with a #135 to...

1979 xs400F So I am now TRYING to get the carbs sync. Once I let the bike idle/warm up and shut off the choke, the bike takes off/over rev's. New battery-good charge New coils-Both primary's and secondary's checked out on install. Going to chack again Electronic Ignition! Valve spacing has...

I have a problem that my bike doesn't want to go any faster than 45 maybe even 50. I have stock jets still and I'm not sure if that means much. When I screw out my fuel mixture screws nothing happens. I already cleaned my carbs. It is also sometimes difficult to start.

Hey new to the site just pick up a bobber project 78 xs400 but I was only able to find 81 xs400 carbs just seeing if anybody knows jet sizes recommended to use from past experience or any other advice, I also live at sea level if that matters thanks.

I recently finished (well got to a ridable point) my xs400 hardtail and I am having carb issues. It will usually fire up in one to three kicks with the choke fully engaged and as it is warming the idle steadily climbs. When I disengage the choke it nearly dies without some throttle and has to...