Bike is running hot

[Draco87]

Hi guys wonder if you could shed some light on this, I have a 1992 125 Yamaha sr custom when I bought the bike a few weeks ago I decided to do a full clean on it not done an oil change yet though, I cleaned and changed the air filter and sprayed the foam with a bit of air filter oil, I also did a full clean on the carburettor ever since ive cleaned the carb the bike is now running hotter than usual and will only start once the choke has been pulled out, I am wondering if I have not tightened/loosened anything correctly in the carb itself, has anyone come across this before, a friend has said that there may not be enough air getting in for the mixture

[RhynoCZ]

I think the mixture is too lean. If it was too rich the engine would run colder, VTR1000SP had rich mixture on the back cylinder to cool down the exhaust valves. Take of the spark plug and check it for:

https://www.aa1car.com/library/reading_spark_plugs.jpg
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Draco87]

Thanks for your reply it has been very helpful the problem o have noticed is when I run the run the bike I can smell a petrel scent from the engine and I had changed the spark plug due to issues starting the old one had alot of black soot on the bottom, ive had some advice that the bike may be running too rich and by doing some research on the plug it also corrisponse with that but I do still have trouble starting without the choke and the bike seems to be using a lot of fuel

[RhynoCZ]

How did you actually measure, the engine is getting much warmer than normally?

Rich mixture = colder engine (no need for choke to start)
Lean mixture = warmer engine (always needs choke to start)

I'm not sure you clearly understand what you're actually saying.

EDIT: Both, lean and rich mixture ruin the plug, plus lean mixture reduces the service life of your exhaust valve/s.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Draco87]

When im riding the bike to college and back the bike will give off a slight burning smell can't usually smell it until ive ridden for about 10-15 mins and a friend of mine who I ride with we'd stop off and his would be significantly cooler just by putting my hand on the engine itself I can also feel the heat through my boots I can't get an actual gauge because it doesn't have a temp gauge but it would cut out where as before it never did and

[RhynoCZ]

Well, the easiest thing to do here is to take the manual and set the carburetor to default settings. The mixture is probably too lean = too much air coming through the carburetor = not enough fuel going into the combustion chamber. Also use proper spark plug and air filter.

About the smell, does your engine lose oil or have you ever cleaned the engine? It's air cooled and more dirt you've got on it hotter it gets. Plus some brake pads get smelly when they're worn and get hot, to tell you, you should change them.

Start with the manual and try to set the carb right.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Draco87]

I can now confirm that the bike was running slightly lean, ive the carb back off and blown through it all turned out the pilot jet was blocked and adjusted this also adjusted the mixture screw the bike is also ticking over better later on I will take her out and see how she runs, the smell I think was actually coming from the over flow as the pipe was a little wet hopefully fixed that too Double checked spark and it was white at the end which idicates you were right showing signs it is running lean, but ill let you know on the progress

[Draco87]

Just letting you know got the bike running right now she still bogs out a little which hopefully some fine tuning on the carb will fix

[RhynoCZ]

Good to hear you're getting there.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[2wheelsteve]

I recently removed my air box and replaced with air filter pods, the bike at first runs brilliant, starts first time often without choke but after about five miles winding the throttle off and the revs don't drop as they should, running hot as now too much air.
getting a dyno kit for the carbs though I heard with my bike turning up the fuel inlets 5 turns does the job.
Messing around with the carbs is something I hate as it rarely ends well but didn't realise changing to pods would cause so much of a problem.
either you have messed with the air filter/s or fiddling with the carb has caused your problem but since you said you messed with the air filter that would be the first and easiest to check, good luck.
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Ride Safe

[RhynoCZ]

[2wheelsteve]