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I am replacing my front sprocket, my rear sprocket and my chain. In all likely hood, at least the rear sprocket is original. The bolts for the rear sprocket were incredibly hard to remove. The bike has 28,000 Km (17,000 miles) on it. You can see the hooking the rear sprocket indicating it’s...

Interesting. Who would have thought! It certainly doesn’t take much to bend the tabs, and that float level makes such a difference to so many circuits in the carbs. That’s what’s great about these forums, information that not available in service manuals. I too am replacing my sprockets, my...

Exactly my experience with those same screws too! I cannot understand what they used or why they used what they did to cement the screws in. Of course any movement in the bracket could have consequences to the sync, but glueing them in!

When you say “swap the floats and needles from side to side”, are you also switching the float seats too? If not, possibly it’s not just a stuck needle. It might also be that it is not seating properly, or the seat is clogged…etc, etc

The ambiguity is driving me nuts! Unfortunately I don’t have the original owner manual for my Maxim which presumably would have the correct answer. For my Maxim, are the main jets 127.5 and 117.5 like the Seca Service manual says or 125 and 115 like a few but not all, sources say? Does anyone...

The old clutch cable has totally freed up now after sitting for a few days,… after my oil treatment. That means there probably are not any broken strands after all. I’ve got a new one on order, so will still replace it. I’ve got a spare now. CAD has been the tool I’ve used in my career. It’s...

That is a switch that allows you to overide the normal protection of the starter not working while in gear (useful if you stall at an intersection and don’t need to move the tranny back to neutral which you would have to do if there wasn’t a switch). Pulling the clutch in activates the switch so...

I am replacing my clutch cable because it is sticking. I found a wear point on the cable (see the second photo). There may be broken strands inside causing the resistence. I tried to lube the problem away so there’s more to it than just needing a lube. If you look at the first picture, that is...

The two small 10mm bolts get removed and the oval “lock washer” spins to align to the notches in the sprocket spline to the notches on the transmission spline. The sprocket then slips off very easily. In fact it is a loose enough fit that I wonder if the play is intentional. Having a little bit...

Also if in neutral is it normal for the front sprocket to have a bit of horizontal play?

I can’t find anything in the service manuals (xs400 and xs400 seca). It looks simple like taking the two bolts out

I am not sure what this lever thing does. Is it some sort of throttle locker?

I’ve torn apart and cleaned my BS34 carbs. I have found a multitude of problems so far: 1. The right side carb float needle was stuck. I changed both float needles (purchased from MikeXS) in a partial kit. 2. The right main jet tube was horribly dirty, greenish, crud all over it, and the pin...

I am in the process of restoring my 1982 Yamaha Maxim 400 J (aka 15G,… 12R model). As I work on it, I will post definitive results that hopefully will help others too. The connector between carbs is an aluminum tube measuring 9mm O.D. It has (4) O rings that seal the fuel transfer between the...

Hey thanks kebabs! The more I understand the better. Getting it back to the original factory specs is the only way to have a reasonable starting point. Since its only got 21,850km on it, I suspect it has not been running very well for a very long time. Over the last 43 years there’s been some...

My dilemma is the measurement of the float level…..32mm or 28mm? The information I’ve read so far is non conclusive. Mine is an xs400J, a Maxim. Is there a difference between a XS400 and a XS 400J in float height? Or, some have said a “brass or a plastic/rubber float” makes the difference. If I...

I’m a little nervous of pulling them off. They seem to be quite brittle. And I’m concerned they may be some kind of none available odd ball! There’s two each side so some redundancy for sealing. I don’t think it’s leaked “YET”.

Yes mostly back together. I bought a carb kit from Mike XS. It provided new float needles, main jets, pilot jets and carb gaskets. When I took the jets out I discovered a #120 on the right side and a #127.5 on the left. From what I read the XS400J (maxim) stock should be 115 and 125. That was 2...

It’s the fuel connector between 2 Mikuni BS34 carbs off of my 1982 XS400J Maxium 15G. The OD of the aluminum tube is 9mm. I have some MIL spec fuel O rings of various sizes so just wanted to make sure I am replacing the old with similar if not exact. If you look at my disassembly picture above...

Would anyone have the O ring size for the connector?