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Does anyone know xs400 mechanics in scotland

hi there i am changing fuel system from vacumm petcock valve on tank to manual fuel tap , do i cap of the vacum ports on the inlet manifolds on ech intake maifold (mikuni bs34 carbs fitted} is that all i have to do for the bike to run normal , or do i have to do anything else. i would...

Hi guys I have a 1977 xs 400 . It starts and revs OK for about 5 mins then cuts out , it will not start again when hot . It will start again when engine is cold then cut out again in 5mins. All jets and needles are new. Any guys got an idea what is the problem. Ignition 100% spot on. New ht...

Hi guys I have a pair of mikuni bs34 carbs for my 1977 xs400. Could anyone tell me the diameter of the hole in Air Pilot Jet . I have attached a diagram. On the diagram the air pilot jet is number 53 on the air intake side of the carbs. The Air Pilot Jets were missing when i got the carbs...

Hi Guys Hopefully someone can help me out here.i have pair of Mikuni bs34 carbs on my 1979 yam xs400d. This issues are as following. I require 2 x pilot air jets with 6mm threads on pilot air jet , i have attached a pic of the air intake side of the carbs, they were missing when i got the...

hi there i have a 1979 xs400 , it has a non vacumm fuel tap on fuel tank and both vacumm pipes on carbs have been sealed. the compression is 145psi each cylinder.the timing is 100% spot on and replaced both HT coils so there is a great spark on each. i cant get the bike to start , the only way...

hi there hopefully someone can help me out , i have a 1979 xs400 it has been rebored and i require 1mm oversized piston rings. i cant seem to find them anywhere. does anyone now where i can get 2 sets. appreciate any help. cheers dave

i have trouble with low compression mine is 120psi should be about 165psi i tried a wet test with small amount of 2 stroke oil in each cylinder, refitted the spark plugs (did not fit the HT leads) the wet test brought the pressure up to 135 psi on each cylinder. stripped head off to make sure...

Hi there i have a 1979 xs400 , I have overhauled the carbs , Fitted new HT coils. Fitted new condensor and points getting a great spark . Timing is spot on. the problem is the bike wont start from cold either with or without the choke . I squirted a small amount of petrol in each chamber through...

hi guys i have a 1979 xs400 that i am rebuilding, i have fully serviced the twin carbs (fully cleaned/ new jets and needles fitted) replace both the ignition coils and condensor and points (also checked the camshaft marks to points shaft mark that are spot on) i removed the rocket cover and the...

i got a rebuild kit for carbs as they were not perfoming l, when i was replacing all the parts i noticed the pilot screws (the ones with plastic pastic caps to stop you altering them) on both carbs were broken and the thin end of the needle of the screw was siezed in the carb bodies , when you...

i got a rebuild kit for carbs as they were not perfoming l, when i was replacing all the parts i noticed the pilot screws (the ones with plastic pastic caps to stop you altering them) on both carbs were broken and the thin end of the needle of the screw was siezed in the carb bodies , when you...

hi there i have a 1979 xs400d that i am rebuilding for a mate, i have carried out all the wiring and fitted a new battery , when i switch the ignition switch on in any position i get no power to any lights / indicators / relays / oil - turn - neutral and speedo / tacho lights , non of the...

Hi there I have a 1979 xs 400d which came in bits, building the mechanicals no real problem but could do with a good electrical diagram for the bike I cant find a good one anywhere. Thanks Dave