r/MotorcycleMechanics

Image 1 — Carb throttle shaft seal
Image 2 — Carb throttle shaft seal
Image 3 — Carb throttle shaft seal
▲ 3 r/MotorcycleMechanics+1 crossposts

Carb throttle shaft seal

Found a major leak through this felt throttle shaft seal. Its a keihin carburetor off of a honda cbr 600f.

Cant find replacements, but im sure i can fit a rubber o ring. Would that work? There is a presseure spring pushing on this side when its in the carb assembly. Its weak tho.

u/HentaiPro9000 — 11 hours ago
▲ 10 r/MotorcycleMechanics+1 crossposts

Thinking of buying...

Been looking for a street triple 765 for a while now and seen this ad on autotrader. Its a 2017 RS model with 16.5k miles on it with a 4k mile 2021 engine.

I asked what happened to the original engine and who fitted the new engine and they replied with: "We had sold the bike to its previous owner the engine then dropped a valve so we refunded him under our warranty. We then waited until we found a good low mileage unit which we fitted to the bike."

I asked for service history and asked if it will be serviced before selling, they wrote: "The bike has a recorded service history - 7 stamps in the book and we have serviced the bike when we fitted the replacement engine."

Is this a good deal? Theyre asking for £5.3k which seems like a good deal on paper, but when i go to sell the bike in the future this will be viewed as a negative

u/Apprehensive_Age3546 — 11 hours ago

Cracked engine on 1993 Yamaha Virago 535

Hello,

Bought this 1993 Yamaha Virago 535 a week or so ago and just noticed the the underside of the engine has a pretty big crack in it. It's big enough that you can easily feel it with your finger, but it doesn't seem to be leaking oil at all.

How bad is it ? Can I ride like this ? Anything I can do ? I am gutted.

u/Ashford_Hills — 12 hours ago
▲ 3 r/MotorcycleMechanics+2 crossposts

Clutch Lever

I replaced my clutch lever after breaking the ball off on the original lever, and when I replaced it the lever is super loose and has zero tension and immediately stalls when I put the bike in 1st gear so I tried putting the original lever back on and having the same issue what am I missing?

u/Destboom56 — 18 hours ago
▲ 32 r/MotorcycleMechanics+1 crossposts

No power after wash

Did an oil change and coolant refill on the bike. Afterwards I washed it. After the wash I took it on a ride around the block to test it, bike shut off mid ride and had to walk it home.

Now nothing on the dash when I turn the key. Used a hose instead of the usual bucket to spray off the excess coolant / oil from pipes and let it burn off.

Where can I look to fix the issue I just got my baby 😪

u/Far_Notice3102 — 20 hours ago
▲ 6 r/MotorcycleMechanics+1 crossposts

Could it be a fuel issue

2005 SV1000S
Lit just cleaned the injectors, replaced the spark plug, drained and refueled the bike (Dw abt the battery) it wanted to start so bad before the battery died. Even with starter fluid it starts for like a sec then cuts.

u/Asian_Cody — 22 hours ago
▲ 3 r/MotorcycleMechanics+1 crossposts

Jet Sizes

Hello! I need some help people. I plan to put these pipes on my 2004 VT750C Aero. Motor is completely stock, still keeping the stock air box as of right now.

I’m trying to figure out what jet sizes I need for both the main and pilot, how should I set the mixture screw, if I’ll need any shims for the needle, that kind of stuff.

I appreciate any and all help and answers, thanks!

u/Scared_Judgment_4786 — 17 hours ago

Nail in my new tyre without puncture. Good to go?

I found this nail in my brand new tyre today when driving back home 🤬. I pulled it out and didn’t find any air leak when checking with soapy water. Do you think the tyre is still good to use?

u/ExistingRoad9275 — 1 day ago

Does this look like stem seals leaks?

Mechanic thinks it's stem seals leaks and wants to start the engine head job. (Valves lapping, head gaskets and stem seals).

I am not convinced it is a oil leak. I have never noticed blue smoke puffs or any idling issue.

Rsv4 1000cc

I don't want to do it just cause because it's big money in India. If it's actually an issue I will park and fix later.

Edit: There was oil in airbox and throttle bodies but mechanic said that's separate.

u/Charlie_Kasper — 24 hours ago
▲ 5 r/MotorcycleMechanics+3 crossposts

2001 zx600e crank no start

Ask any questions, the carbs are leaking a bit of fuel when cranking for the first time after reinstalling them. I replaced the floats. When I removed the fuel filter it ran but jumped to high rpm, the video is of after I installed a new fuel filter. It seems to not be getting enough fuel? Is it the fuel pump? Any help is greatly appreciated.

u/yeesh9 — 1 day ago
▲ 2 r/MotorcycleMechanics+1 crossposts

Ninja 400 starting up question

Hey guys! I have noticed recently when I start my 2020 ninja 400 the RPMs go much higher than it used to and then after about 3 seconds will go back down to its idle RPMs. It also sometimes takes a little long than usual to turn over (maybe only like 3-5 seconds longer than usual). Any ideas what this could be? No lights in the dash and has ran perfectly since I bought it a while back with only 8800 miles on it right now.

For reference, it didn’t used to do this and my friend has the same bike and it does not do this.

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u/mands8 — 21 hours ago
▲ 1 r/MotorcycleMechanics+1 crossposts

What is this Weird screw I find on my 2nd hand Kawasaki ninja 250 ABS?

I have a 2019 Kawasaki Ninja 250 ABs, brake pad was gone today but when I wanted to change it, this bolt baffles me. Definitely not stock. What could this be and how do I open it ?? What tool should I use 😅

u/Silverphera — 1 day ago
▲ 5 r/MotorcycleMechanics+1 crossposts

need help diagnosing a problem

check engine light comes on and bike dies shortly after and doesn’t want to turn on , it bump starts i believe it’s battery related could be stator not sure tho if anyone knows lmk pls

u/Fresh-Park-4801 — 1 day ago
▲ 6 r/MotorcycleMechanics+1 crossposts

Oil leak on a new bike (10 months old)

This is not the post i wanted to make. Especially knowing its a Honda.

Honda CBR650R 2025, no e clutch

Theres an oil leak in the middle of the bike, somewhere i cant see at all, and its dripping on the catalytic converter, the oil filter is wet underneath, and the oil is coming from above and its dripping on what i believe is a frame strut underneath. So the leak is somewhere up in there. If ANYONE knows anything, id appreciate it. On the pictures you can also see its coating the rear tyre and wheel completely.

The leak started small on a 30 minute ride for me, where i did NOT ride aggresively, it was a city ride. Smelt burning, it was burning oil on the exhaust. My girlfriend went to ride the bike again to confirm its an actual sustained leak and not any residue oil, rear tyre and wheel coated, burning on exhaust a lot and the whole bottom is now coated in oil. Not running its not leaking, only when warm. And riding.

We will call the dealer and sort this out under warranty but its extremely annoying as theyre in a whole other city to us.

Bike has never been dropped, has been serviced and looked after. Already had problems with the ignition (sorted under warranty) and button to control the screen (also sorted under warranty).

This bike is slightly cursed.

Weve owned it for 7 months now.

u/shark_pupet — 1 day ago

Bad Idea?

Thinking about picking up this 2025 transalp with only 300 miles, is 3.5k fair? most of the damage seems cosmetic, he said the forks and frame are good.

u/keevin8 — 1 day ago
▲ 4 r/MotorcycleMechanics+1 crossposts

1993 Suzuki Katana Gsx600f high idle

Hey all. When starting the bike, RPMs will be in the 5K and will continue to climb until the 8K+ range as if the throttle is being held open.

Throttle is free, idle adjustment is all the way out, and intake boots are new with no cracks or obvious air leaks. Floats are also adjusted, jets are new, and carbs have been cleaned multiple times.

Out of ideas on what could be causing such a high idle. Anyone else have this issue or ideas on what I could be missing?

Thank you!

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u/KelleyTheYank — 2 days ago
▲ 6 r/MotorcycleMechanics+1 crossposts

Weird Gurgling sound on exhaust

I have a 2020 Honda Cbr500r and it makes this weird as sound when reved. It gives out nice pops and bangs but it also does that …

u/ValuePretend6957 — 2 days ago
▲ 5 r/MotorcycleMechanics+1 crossposts

Help fixing scratches affordably

Got this new 2024 XSR900 and it came with this paint chip on the tank.

Additionally, I was putting on a phone mount and scratched the handle bars.

Went to a shop and they said this would cost 400 dollars to fix. Is there an affordable alternative? I see scratcheshappen has product but not sure if thats the route.

I applied some clear coat to the scratch on the handlebars so it doesn't rust while I figure out a solution, but afraid that I might have made it more noticeable.

Mainly looking to prevent rust.

Thank you!

u/ComprehensiveCar5117 — 2 days ago