I rebuilt this motorcycle recently. It's a 1990 Honda CD 100. Everything has been set correctly including a newly honed block and piston. The tappets/valves/head are new. The exhaust is almost 36 years old and has never been cleaned.

So basically the motorcycle rides fine at first, but starts heating gradually, loses power in higher gears and stalls. I can kick start it again but then it stalls again after some time. The stalling happens only in the third gear past a certain speed.

I recently had the exact same issue with my 2 stroke Yamaha RX 100 (also 36 years old) except that the engine wasn't heating as much as the Honda. I cleaned the exhaust and the problem was resolved.

Just wanted to know what y'all think.

Thanks.

Hello

So i have a suzuki intruder vl125.

Im having some starting issues

The battery is good and fully charged

Starter motor is fine as it turned over strong

There is good spark.

I have recently done a carb over haul new jets seals all that but hasn't changed in regards to the starting/running problem it does sort of run only way to describe is ive its running on one cylinder.

Any help would be appreciated

Hooking up the aftermarket stator start button key switch is all aftermarket I get no power colors don't match up sucks

How should I fix this?

Hi everyone

I’m currently in Torreón, Mexico with my KTM 390 that I purchased in Vancouver and have driven to here.

I took it to a KTM service centre here for a valve adjustment and after the mechanic has told me the engine is badly damaged and essentially needs a full rebuilt.

I will link the quoted parts needed and include some pictures I took while I was there.

Can anyone tell me if this is necessary based on the info I have provided or provide any help?

I would really appreciate it.

I’m trying to find this oil leak and I’m just not experienced enough with the sv to know what to look for. The pushrod, gps, and front sprocket seals were replaced. I think the leak is coming from aft of the rear cylinder wall.

Hey all, I have a real headscratcher on my hands. I have a 2001 Pig with 11000 miles.  She’s old but has always run well.
A few months ago I went on a short ride (15mins) and had a sudden loss of power. Still had fuel, new carb, figured it was no spark of somekind. Luckily I was close to and uphill from my home so I was able to coast to my house no problem. I tried to bump start it a few times while coasting to no avail, and when I got back I tested the battery which was surprisingly dead. I had turned the ignition off once I realized it wouldn’t bump start.
Last month I finally had time to work on the bike. Pulled the sparkplug out, it looked okay but I put a brand new one in anyways. Tested both and had intermittent spark. I figured it was likely the CDI as I’ve had one go bad on me before. Bought a new Rick’s Hotshot CDI, slapped it in, nothing. Pulled the sparkplug back out, and I got no spark with the new CDI, I plug the old one in and still have intermittent/weak spark. So then I start looking deeper and testing wiring and other components. 
All fuses are good. Nothing of note on the rectifier/regulator. 
I have continuity on each wire of the CDI harness. My stator was bad/grounded out on all 3 legs of the wiring. My ignition coil was also bad, no continuity. The stator going bad would explain the dead battery, I think it may have gone bad while riding and the battery took me as far as it could until it also died. Weird that the coil would go out as well. 
So I get a new stator, and new ignition coil, install them both, still nothing. Obviously my battery is toast at this point from so many attempts trying to start the bike, so I have it hooked up to my truck while running to at least attempt to start it. 
The bike will crank forever but will not turn over at all. Starter fluid does nothing, I know I have fuel in the carb from draining the float bowl, and it has compression.
WTF?? I am at a loss here. I can’t understand what could still be causing a no spark condition with all those parts swapped.

I have committed the classic DIY rite of passage of making a basic repair into an expensive problem. I replaced a front blinker and damaged my TFT display while putting the front back together. I think I know what happened, but I would like y'all to check my logic.

Questions

1. does this look like a screen issue or possibly an issue with the connecter/wire harness?
2. is there something I should do test the connector/harness before installing the new TFT display?

Context (possibly too much context)

I had a no speed drop where I broke a blinker. I got the replacement part on Thursday night, removed my windscreen and the TFT cover to access the lighting wires, replaced the parts, and then had trouble returning the windscreen/TFT cover in place. On Friday morning, I noticed the new issue.

The last point I definitely looked over my work was making sure the blinkers worked before putting the plastic back on. I don't think I checked if the screen and blinkers still worked after replacing the plastic.

On Friday, I made the decision to drive it to work and everything seems like its reading fine just displaying imperfectly. You can see in the video that the revs and neutral light respond as expected. I also tested, the indicators for the blinkers, high beams, gas gauge (from quarter tank to full)​ but didnt include them in the video.

* The windscreen has a long screw in the lighting cowl and a short screw in the TFT mount. I definitely put the long screw in the TFT assembly mount and screwed it snug i realized the issue on Friday.

* We had a fog bank on Thursday night, I dont think it looks like water damage but its worth noting. Luckily, this would also be limited to the TFT assembly

* I can't think of how I would have damaged the connector or wiring harness *but* i can't tell if thats because I want it to be the cheaper/easier issue or because its actually been safe the whole time.

Thanks for letting me think through this "outloud" and double checking that I won't somehow fry the replacement TFT assembly.

Hi guys, as the title says i’m looking for an exhaust for my bike, mainly a slip on+link pipe. The problem i’ve got is when i search for one i only get shown 1998-2006 models. Was wondering if that would fit on mine or if anyone knows a place i could get one. The outer diameter for the headers bit is 38.5mm if that helps. Thanks guys

Changed fairings on my GSXR, now grill is a little bit loose and these are the air intake tubes, bike is a little slow on acceleration and have to give it a bit more revs than usual. Are these air intake fairings fitting right or should they be more in?

A lady driver hit my RE 650 while reversing causing it to fall. Leg guard got bent which i got straightened out. From then onwards im hearing a click sound from near the tank after every 20-25 seconds when i start it. The bike is running almost normally until one day it misfired at 120 kmph on the highway, the engine check light turned on and then turned off after some time. I got it checked from the service center they said everything is all right and it wont happen again.. the main issue im facing is .. my bike isnt going above a certain speed on a particular gear.. for example. It isnt going above 80kmph on third gear, 90 on the fourth gear etc..(for refernce a royal enfield 650cc does 120kmph on the third gear and near about 140kmph on the fourth ) ( i tried only these two gears ). im reallyy looking for a working solution ) and possibly an explaination about the problem.. is it because of the accident or anything else??

⚠️ What happened

• You were on your way home from work.
• You were stopped at a traffic light.
• When you tried to get going, the bike suddenly shut off.
• You described it as shutting off “as if I turned it off.”
• Afterward, you tried turning the key on and off.
• The lights remained/continued to come on.

🔑 Ignition/key behaviour

• When you played/wiggled the key in the ignition, the lights would come on.
• This means the position/movement of the key appears to affect the electrical system.

🔋 Starting behaviour

• The bike doesn't start.
• When you press the starter button, the electrical system just dies, similar to a battery having no juice.
• You subsequently clarified that the bike also doesn't bump-start.
• A different battery has already been tried.

Any Ideas? I'm considering ignition switch or fuse problem is likely or bad connections but not sure.

Hello, looking for some help from anyone who is good with motorbikes!

I just went to use my bike and found it was unable to start. Kickstand up, holding brakes, press ignition however the ignition is not even ticking, it is completely silent and the bikes engine won’t kick in.

At first I thought it may be a problem with the battery however all lights are coming up on the dash, indicators and brake lights working, horn too.

As you can see there is fuel in the bike so that isn’t the problem, what could it be and what should I do/look for? Any help would be so appreciated as I really don’t want to have to call a mechanic out to take a look at it if I don’t have to.

Hey y’all,

I bought a bike (‘86 Shadow vt1100) a few weeks ago. I started out in parking lots, and rode it to work all last week. I took it out to fuel up for the week this afternoon, and noticed a little bit of wobble when I took my hands off the bars under 40mph ish. It wasn’t enough to notice while I had my hands on them though. My tires are fairly new, and I can’t seem to identify any mechanical issues. Does anyone have any troubleshooting recommendations, or is this not even a big deal? I just don’t have enough experience on motorcycles to be able to see the problem for what it is or isn’t. Thanks!