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Had this 1980 XS 400 SG5 running beautifully last year after eventually sorting a 4000 RPM misfire. Started easily, ticked over steadily but over the winter layup, it drained the contents of the petrol tank into the engine. This despite the petcock and carbs being rebuilt with new seals and...

After exhausting all the possibilities regarding a misfire on my 1980 XS400SE (4G5) with regard to ignition and carbs. I am still left with a bike that stutters and misfires from around 4K revs and struggles to rev beyond when on the move. Still starts on the button and ticks over at exactly 12K...

Hi After seemingly getting this 1980 XS400 running well, its now struggling to get over 4000 rpm under load but will rev cleanly on the stand. It starts easily and ticks over beautifully, in riding it accelerates nicely up to the 4K point after which it starts to stutter and miss. Plugs...

Okay 1980 XS400 SE 4G5 UK model. The Haynes manual suggests 32 mm which seems incredibly high. Both were set at 23mm as dismantled. Views seem mixed, any definitive answers??

Bit of a long shot but I'm ordering 2 x idle air screws at a total cost of $22. However the shipping charge is an unbelievable $40 as Mikes will only use USPS priority International. (even so the total cost is still cheaper than CSMNL) So I wondered if anyone else who is UK based is in the...

After all attempts to remove the seized and head-chewed examples that were living in my carbs had failed, I realised that the only way they were coming out was via the drill and extractor method. As they aren't exactly accessible this was going to be tricky. So yesterday afternoon I...

Okay the starting point is a Suzuki GS1000 and they are in a bank of 4 but the guide is excellent and might help someone. http://www.mtsac.edu/~cliff/storage/gs/Mikuni_BS-CV_Carburetor_Rebuild_Tutorial.pdf Fent

AS an addendum to my previous post 'misfire above 400rpm' I've just taken the plugs out to find that one side is running rich and the other lean. I'm unable to make any adjustments on the pilot jets as both are seized and the heads have been butchered (not by me!!). Advice greatly appreciated...

Just finished recommissioning a 1980 UK model xs400 custom which has stood idle since 1995. Took it up for its MOT test this morning and which it passed no problems. On the way back from the tester I opened it up a little only to be rewarded with a misfire over 4000rpm up to about 7, which is...

Hi New guy on here busy renovating a 1980 UK spec XS400 custom. Its stood a while and Im busy replacing the head gasket and here's the rub, ive dropped one of the cam chain tensioner bolts down into the engine. Rebuilt countless engines and never done that. Oh well first time for...