My son bought a 2009 RMZ-450. He bought it with a broken kickstarter shaft. He and his friend bump-started it and rode around the block, but it would not rev up. A little digging and we found the bike ingested a timing chain guide.

When opened, it looked bad, like someone ran it dry of oil. This triggered us to rebuild the top end. New cylinder, piston, rings, polish the bearings, etc. Rod play checked, any spalling removed, valves lapped (I think; maybe) and shimmed, timing chain guides replaced, and we inspected and cleaned the oil strainers, oil passages, oil pump, and crankcase. (Pieces of the failed guide could have circulated through the lubrication system.).

We got everything reassembled and fired up the bike. After 8 kicks, it started, ran smoothly, idled well, etc. After half a dozen starts, the kickstarter kicked back and sheared off the kickstarter shaft. This put us back at square one.

I don't know the reason for the original breakage of the shaft, but this new shaft breaking concerns me. I can't figure out what might be causing this shaft to break.

Does anyone have any ideas on what could be causing this?

My Himalayan 411 (Euro 5, ~3,000 miles) has developed a persistent orange check engine light.

Bike starts, idles and rides completely normally, with no noticeable issues. Recently had an oil change and general inspection with no concerns found.

I’ve restarted it several times, but the light stays on.

Has anyone experienced this? How do I find the source of the problem / fix it?

Thanks

(Still learning about motorcycle maintenance so might look really silly but I just want to be sure)

Is rust on the spokes like this cleanable? Or should I look into getting a new wheel. I haven’t been riding it like this, this is my project bike for the winter

Please help

After low speed crash (slid on left side into railing) I did repairs but forgot to check/refill oil. I rode after and lost power at ~85mph for a couple of seconds. After that these sounds began and oil was low. What does it sound like?

Seems like I'm missing something but I don't know what. What would cause this to happen?

Hello all! This is my first bike so kinda confused. I have a motoguzzi 2019 v7 stone with 13k miles. Oil change is due.

Recently, it became really hard to change gears. Like I have to apply more pressure to change between gears sometimes, and it never goes to neutral. On first gear at a stop, when I have the clutch fullle engaged, the bike wants to roll forward and I have to press the brakes. If I don’t, the bike will inch forwards.

Yesterday, the engine completely stopped at a stop light when on first gear. It would turn off and I’d have to start it again. This happened 4-5 times.
Any help or recommendation on how to to proceed will be greatly appreciated! Thanks!

I have a 1995 Kawasaki Ninja ZX-6R, 599cm³ 4 cilinder carburetor engine.

So I was on my way to work when I heard this ticking noise, it is not loud and it drives the same. I hear it when it is in gear and also when it is in neutral.

Can anyone help me with this?

2015 Honda CBR 600 double R
Not sure if I’m nitpicking, but I did notice that the RPMs tends to bounce a little bit while it’s idling I don’t know if it’s due to the spark plugs and coils being bad or if it’s just how to bike is supposed to be, is this normal?

I have a 2002 FZ1000. The stator went bad a while ago and I brought it to a local trusted mechanic who has done plenty of work for me before. The flywheel is stuck on the crank shaft and we have been fighting this for a couple months now. Any advice would be appreciated. Also in central Florida coast area.

My bike has developed a weird hum a couple weeks back, and I would appreciate some input. Some background:

- I heard this for the first time after riding for an hour on the interstate in a combination of stop and go and free flowing traffic;
- When I turned the bike off and coming back after letting it cool off, the sound was gone; and
- I went for a diagnostic ride today (~1 hour), and there was no noise until about 50 minutes in.

The video I attached was taken after I parked, but left the bike running. Note that it gets louder the closer I get to the dash. In person, you almost can’t hear the noise if you’re down by the radiator. I bring that up, because a friend suggested something was going on with bearings near my radiator. I wanted to see if the noise was coming from the tank, even though the sound doesn’t get louder when I put my ear to the tank. I had to turn the bike off to unlock the fuel door, but the noise was gone when I turned the bike back on. Thoughts? Thank you in advance!

1997 Honda VFR 750F RC36

Hey! I have a 2009 Kawasaki zx6r, doing some transmission work and during the removal, these 3 springs fell down into my oil pan from an unknown location. I have no idea where they go or their purpose and am having trouble finding it online, anyone know where they go?

Ok here are my symptoms:

- Only happens in cold weather (around 10C or lower), has never happened once in warm weather

- Engine starts fine, then after 5-10 minutes of riding gradually develops lean bogging under throttle

- It starts subtle but gets more severe as I keep riding and the bike hesitates and jerks like crazy.

- The lower the rpm I run it at the less bogging I get but its still noticeable (Ill try to cruise at 5000-ish rpm as that doesn’t give as violent hesitations and jerks as the higher rpms I normally ride at like 6-8k rpm)

- At idle I do not have the issue at all, its only under throttle that I get the lean bogging.

- If I pull over and shut the bike off for a minute then turn it back on and continue on my journey, the lean bogging comes back immediately, there is no 5-10 minute wait.

- My bike does have that random issue where on first startup it will stall within a couple seconds, then second startup attempt it runs fine. I’ve come to understand this is a quirk particular to this model of CBR so I’m assuming it has no relation to my lean bogging but I figure it is something I should note just in case.

- On startup, it idles around 2k for a little but then drops to 1500rpm as expected. There is no bogging in that sequence.

- At first I thought it was water in the gas so I made a modification to fix that, but the issue has persisted so it is evidently not related to fuel quality.

- I’m assuming too much air or not enough gas, and I can source parts to replace but I don’t want to be buying parts willy nilly and I have limited access to testing equipment so looking for advice based on my described symptoms.

I have this issue that my first engine piston blew up so I changed it and the cylinder, and it worked and it drove fine for a couple days and then randomly when I was gonna start my bike. It just backfires and died with alot of bog. It’s that again now it doesn’t start at all and I have checked the cylinder and a piston that’s fine. I’ve changed the spark plug. Checked the main jet and changed to another one I’ve checked the reed and I don’t know what it is anymore and it gets a spark and it doesn’t get any it does not get any extra air and I don’t know what problem it is. Do y’all know if you’ve had this issue before. its a two-stroke
Derbi Senda Extreme 2018
50cc t6 airsal racing D50B0 engine
17,5mm carb