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Thanks guys. I'm going air box for now, managed to find some parts that weren't extortionate, I think rebuilding the intake as stock for now is the best. Especially as I'm hoping to run a non-stock exhaust.

So I managed to get my hands on an XS400 frame to go with the engine I am rebuilding, but I need a swing arm. Most on eBay come from old XS250s. I know some of the specials had longer swing arms, but it is the fitment, more than the length that I am concerned about. Cheers

thanks chaps

I am rebuilding an XS400 engine (see signature) and I do not have the Air Box, H-Pipe or Filters and they are expensive to get here in the UK (and they are ugleeeee!). I also don't want to try pods (K&N, Uni or otherwise) as this is my first engine build and I haven't even seen the thing...

I know this thread is almost 4 years old, so sorry mods if this is breaking forum etiquette. However, this is the first thread that comes up when you search "conrod bolts" and there seems to be a lot of misinformation here so I thought I would add some technical info to help clear things up...

I have measured the crankshaft for ovality with a mic and it is still in spec - I couldn't find the shaft size listed however. I don't really want to go down custom bearings tbh, I think it'll be safer to carry on with what exists. Thanks. Not to be a pedant, but if the crankshaft is ground...

Sadly, in the UK we don't really have that many automotive machine shops.

Hey guys I'm not sure if there is a proper term for this - but has anyone rigidly mouted the engine and removed the lower tubes? Not necessarily intending to do this myself (would need a frame first!) but would be cool to see some pics if this is something some people have acheived. Ta x

So says the Haynes manual (and it says you may need to replace them) but the Yamaha manual doesn't - unless you have seen otherwise? It's kind of a moot point tbh as they are as rare as hen's teeth / rocking horse sh*t. I think I will go to the maximum torque (or one over) and hope for the best.

So managed to take some photos. I know it's tricky but what do you think?

Wow, thanks for all the information Mike that really helps. So just to be clear the bearings get thinner and the bore gets bigger as the numbers go up? I'm actually doing a 250 to 400 conversion, so a full rebuild was pretty much on the table anyway. I probably could have got away with not...

Hi All, So I have still got my engine in pieces and although the big end bearings are still in tolerance (just!) and aren't too scuffed up , I may as well replace them. I followed the instructions* to find the colour in the manufacturer's and Haynes manual and I need 2x Brown bearings. The...

Got it a bit more lubed up, it definately feels like it's not meant to come out as it stops very positively if that makes sense. I think I'm gunna leave it and get on with the rebuild. Wish me luck!

Following on from my sandblasting fiasco, I am doing as much of a deep clean as I can including washing out all the oil feeds. With that in mind, what is this in the attached pic and should I be able to get it out? I can lift it by about 5mm but then it stops dead. My guess is that it's a flow...

Thanks guys - I took the parts to the painters and he wasn't put off by the dust. He said he would blow everything off with 14Bar of air before he starts anything. So I guess I'll just have to wait and see. I couldn't find any posts by a Tyler Shiel when searching - do you have a link?

Okay, so I am going to start this post by mentioning that everything was done in good faith - I know there are a limited number of these engines so I want to apologise in advance if what I have done is the equivalent to motorcycle heresy. I won't bore you with the details of how I came to the...

That's a fair point. So do you or anyone else know the grade of bolt Yamaha use? Or would going for the highest grade be the safest bet?

Hi All, So I have stripped and cleaned my XS400 engine and am about to start the rebuild. I purchased a set of SS bolts for the engine off've eBay ( *Link*). This doesn't contain all the bolts for the engine assembly so I was going to measure the left overs and order individually. But then I...

Thanks for the replies. It's a fair point about mixing up used parts that haven't been "wearing on each other" as such. As far as the cam goes, I have two replacement cams in the job lot I bought, but from inspecting them they look no different to each other or the one in the 200, so I suppose...

Hello All, Thanks for accepting me onto the forum. A while back I purchased an XS250 engine with a the parts to covert it to a 400 for a bit of fun. This afternoon I was cleaning and building the XS400 rocker cover the when I found that I was missing a rocker shaft. So rather than rush out...