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I just got the XS400 vacuum synced and strobe timed. New oil and new plugs about 35 miles ago. The problem is it wont pull well at WOT. At low and mid range it runs as it should. At WOT it coughs and looses power. If I let back on the throttle to about mid range, it picks right up and pulls...

I need some good advice and input on this one. I changed out the head gasket since the old one started leaking on cyl 2. After putting everything back together I had to advance the points plate by an additional 10-11 mm than recommended by the shop manual, to get it to start. It starts and...

Hi gang. This is getting frustrating. On my CB750 this went painless, but on my XS400 I can't get it to start, after changing my head gasket. My problem: It wont start. I get an occasional cough out of it and one or two back fires. What I've done: Had the engine out, the top end of...

I pulled the head of my XS400 4g5 1983 motor a couple of nights ago, due to a leaking head gasket. Now I didn't find any damage to the head gasket but quite a bit of grime on the fins where the leak(s) is. I tried the search field, but didn't turn up anything useful on these questions, maybe I'm...

Been a while since I was last on here.. Been way to busy with my other scoot. BUT now it's time to give my XS400 some long needed love! Since my head gasket is leaking I have to change that one. So I thought, while I've already got the head off I might as well try and get some power...

Ok, I just did this due to swedish regulations on having the swedish equivalent to the DMV, to inspect my wifes bike. This is done every 2 years here in Sweden. This have certainly been done by many other members of this board, but I couldn't find any threads here on it, when searching. With...

Hi gang. So I have a distinct noise coming from my enginge when I "coast". I can't hear it at idle or when I rev up or when I accelerate away. Just when I've reached my speed and keeps it there. Then I hear a distinct "clonking" or almost a banging. Not like hitting metal with your hammer...

I've searched this site and I've went through the manuals, without any luck. Maybe one of you more experienced guys can help me out? My problem: My master cylinder was hanging upside down for a couple of weeks while awaiting new handlebars (stupid I know). Before that I had the front brake...

So I need to change out my coils on my XS400 because I left the ignition on over night and probably fried one (or both) my coils. Stupid-stupid.. The question is, could I use two coils from my stash of CB750 parts and run just one spark plug out of each? Anyone know? The CB750 coils are 5 ohm...

I was doing some cleaning up before sending my tank to paint and apparently ground of a little to much on one weld on the tank. (I know - I shouldn't have been grinding there at all - but what's done is done.) :banghead: Now I've got a leak ther. About one drip every 6-7 seconds. My question...

I've just got called to make the equivalent of the yearly DMV inspection. (It's called "besiktning" here in Sweden). Then I read through the last inspection protocol and found that there is a remark on "cracks in front right engine mount". It will not pass another inspection without me fixing...

Hi gang. I have to ask. Does these spark plugs look as if my scoot is running to lean or just right? Any thoughts are appreciated. First Second Thanks.

Hi gang. I was going through the documentation on my build and stumbled across the kW/HP number stated in the registration. My registration says 26 kW, but when I look up my model on bikez.com I get 19,7 kW. :wtf: It sure feels like the 26 kW (I've had a Suzuki Savage with the same amount...

Just got a jetting kit from Sigma6. I've put in the main jet and moved the needle accordingly. Now the instructions states that I should sync my carbs. I've built the tube thingy so that I can sync my carbs. The thing is - where's the frekkin' mixture screw? I've got the schematics and where it...

As the head line states.. I'm thinking of switching my speedometer. Does anyone know if this one "Part #03-0744" from www.mikesxs.net fits? Bolt on? It's a mini speedometer with lit indicators. My head concern is the lights and if they will work? Neutral, oil and so on? Any ideas or thoughts...

Swedish xs400 bobber done. Hi gang! I'm from Sweden and I just bought a xs400 se 4g5 1982 after reading through this (and the xs650, amongst others) board. It has just under 30k miles on it an runs strong so I think it will make a good start for my build. I'm going to try and turn this...