engine

Hi, I have recently bought a Yamaha XS400 1982, It's my first bike ever and I just have a very little knowledge of mechanical work. My bike heats up very fast if I go for 5 to 10 km's, a smoke starts to come out of the exhaust area. There's enough engine oil so I don't think that is the issue...

So long list of problems to take care of right now. Piston Rings Left Cylinder burning oil like a siv, this is new. Gonna re-fit both. -(Just a guess, but leak down test was 130psi, add teaspoon oil, 150psi) Need a new chain as mine is kind of seizing and making terrible noises. Sprockets are...

Hello all, Finally getting a chance to put together my top end (pistons, jugs, valves) after re-honing my cylinders, new piston rings and a valve tune up. This is my first time, so I want to make sure I am not missing any gaskets or pieces. I've purchased a gasket set off ebay and was just...

Hey Guys, Just wondering how normal this engine noise is? I moved my phone around a bit just to pick up the variety of the sound around the cylinder head. Increases with rpms all the way up through 5th gear at highway speeds. My dad's a harley mechanic and I sent him the video but I thought...

Hi, My bike in general has issues with startup, but slowly I am getting it working. I am having issues with very slow/sluggish starter motor - I thought the battery is weak, but replaced battery and it seems that my starter motor doesn't have enough power to rotate enginge faster than "thud...

Hi all, Taking my engine out for the first time (to address low compression issues) and am looking for a few tips. 1. Do I NEED to take the oil out? Will the oil filter casing clear the frame when I remove the engine? 2. Any tips for moving the exhaust pipe out of the silencers? Mine are kinda...

Hi all! I've started to restore an XS400 Seca (1982) to it's former glory after being out of traffic since 1995. When I disassembled the engine the pistons looked like the attached photos. Since I haven't done any engine work before I don't know if the pistons need replacing or not? The...

Hey guys! Long story short, my bike had a seized engine. I bought a used 360 cylinder and NOS oversize pistons and all the other hardware.. The piston are for the first re-bore and hone, which is .25mm. When i went to pick the jug up, the guy said he bored them to spec within .003''...

Riding yesterday and after about 2 hours on the bike, (low intensity, for a road test), I started getting sputtering and jumping at about 5-6k rpm, in any gear. After a few times of this, the bike would die, and then I would have to push start it. This happened a few times, and then it...

Hi guys, i have a problem finding air filters for my motorcycle i recently bought. it seems to have a different airbox than the original one. It has a D-shape air filter, which i have trouble finding. Please help.

Just like the title says my newly acquired seca is not starting. My dad and I had just finished cleaning up the carbs and doing other necessary work to get this bike safe and legal to ride when we went for the all important test fire when we were greeted by a sound best compared to blending only...

So I have an 81' xs400. I recently found that it started to sputter in all gears as well as a lot of backfiring. I have read some threads about it and all I really could find are carb issues. So I gutted the carb, cleaned the shit out of it and stuck it back in. It started and ran but still...

Hello everyone, thanks for having me on your forum! I've already read a bunch of great articles and also found my bike's manual on here, which was a huge help! Currently, I've noticed a few odd things about my bike that I was looking for advice on. One thing is that when I turn my bars to...

Hey guys. I'm a new owner of a 1980 xs400. This is also my first motorcycle. I'm trying to get an idea of what the speed range for each gear is. Like whats the fastest I should be going in 1st before I should switch to second, third, etc. Any advice would be greatly appreciated.

Hi there, im new here, but it does not matter i guess :) Im wondering whether some pistons are interchangable between models/model codes respectively. According to thist thread (post #12 http://www.xs400.com/forum/showthread.php?t=4458 ), the 2A2 and 2LO (and also 2G5, 2V6... stops with secas)...

Hey guys! I bought my first bike, a 79 xs400, and can't wait to ride. I did a few things to it like change the oil, installed a new battery, new ignition, fuel filter and a couple other tasks. Im kinda at a standstill as I pulled a couple parts and don't know how to put them back! Thankfully...

A friend of mine mentioned he was going to install a gauge that measures the real time air/fuel ratio in his truck. This made me wonder if a gauge like that could be installed for a motorcycle. The brand name was Auto Meter and they make all types of gauges and meters. Some of their items are...

I have a 1983 xs400 maxim and I need help with the jets I no longer have the air box and I have uni filters on it I still have stock exhaust on it. My question is what size jets should I have now? Any help would be great!

I have an '83 Maxim (DOHC, 13,000 miles) with a leaking head gasket. I have the head off to replace that gasket and I'm thinking while its apart, I should replace the piston rings, but I don't know if its really necessary. I got the bike last year as a project, and haven't run it yet so I don't...

Alrighthere is a 1983 xs400 maxim and its having some spark issues. I had the bike fully running and driving just fine (except some carb sync problems) and I needed my battery on another motorcycle for a day so I took it off. Ended up forgetting my battery at home the next day so I tried to...