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    Engine Temps

    So I got everything running good but I just want to know what you think is a high engine temp and if the spark plugs look lean. After riding the bike for 20min and giving it some juice, the spark plug sensor is reading about 310 when its 88F degrees. Using a laser temp I was getting about 290...
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    What Chain Do You Use?

    So I got a 1982 Xs400 Heritage. The current chain and I would assume original one on the bike now is a DID50DS. But I cant seem to find someplace to buy a new one anywhere because its discontinued. I have also tired finding a DID50HDSS but still no luck. I have seen from googling that people say...
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    Foamy oil

    I had 15w-40 in the bike before just for winter test runs. Decided to go ahead and buy Valvoline 20w-50 motorcycle oil in for the warmer temps now. But once I start the bike and it runs for a couple seconds, the oil becomes pretty foamy. Ive done some googling and what I have found is it could...
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    Inspection cap part number

    I am just pissed but I need your help. So I broke one of the valve inspection caps on accident. So I went on CMSNL and looked up a diagram to find which part I need to find and purchase. Well on the website, for a xs400 1982 Heritage, part 15 is the product number (1H21118600). So I found one on...
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    Breaker help

    Sorry I actually cant figure out what this is exactly. I think its the breaker from what I have read in the manual but at least for the SOHC manual, it doesn't look like it. Anyways, Im putting the engine back together and this is the last thing I think I might have to time correctly? I didnt...
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    Piston Play?

    Back again to hopefully ask one last question so here we go. In this video here (LINK), you can see the piston has a fair amount of side to side play. It does not have any up/down or angular movement. I know the piston wont move like this in the cylinder, but from previous questions I have asked...
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    XS400 Knock Noise

    1982 xs400s Heritage Alright so I made a thread about this a couple weeks ago and asked for some suggestions on what the noise could be. I finally got the top end fully taken apart as I have been busy since then. This is the video of the noise for reference. So while the pistons have been off...
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    How To Remove Breaker Cover?

    Alright I may be an idiot thats missing something but how do I remove this cover? Nowhere in the manual does it show you how to remove it. I went on CMSNL and looked at a diagram on the cylinder hear and can see that there's 2 screws connecting it. I can easily get one of them out but for some...
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    Weird Noise When Running Bike?

    Been troubleshooting an oil leak and finally just installed the battery again. Pulled the choke fully out as its about 30 degrees out and I don't remember the noise being there. It was idling at I think 2-3k, I don't know for sure and then at some point I heard it drop in RPM to around 1.5k...
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    Xs400 Pushrod Leak

    So my bikes push rod is leaking and I am having a hard time finding a place to buy its seal and bushing. Could anyone help me find a place to buy it? MikesXs just has the XS650s seal and bushing and I dont know if they will work with a XS400
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    What Oil Do You Use?

    Just bought a 1982 XS400s and want to know what oil I should use. Ive heard 10w40 or 20w50. But I would like to know what brand you use and the name of the product. Thanks.
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