Question about 2002 Yamaha Serow 225 WE

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Engine over heat

Lower case gets hot

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Chaange the oil regularly with the best possible oil and check for possible obstrucions for air not to get to the hot spot

Posted on Feb 04, 2009

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After driving my bike,when the engine is hot,I will stop and shut down the bike.When i go to restart the bike within a minute ,the starter will engage then stop and will spin again and the bike starts


Usually on Harleys when the engine stops, one of the cylinder might have both valves closed.

The engine is cooled by the air stream as it moves through the air.
When stopped, so does the air stream.

While the motor IS cooling down while stopped, the air trapped in that one cylinder is actually heating up from the residual heat in the cylinder, combustion chamber, etc.

Air will expand when heated (elementary school science 101).
IF the air can't escape (because both valves are closed), it will compress when it runs out of room to expand, which will make the engine harder to turn over, until the exhaust valve opens to release the trapped air/pressure.

Newton's First Law of Motion states that an object at rest tends to stay at rest (basic physics).

Where this applies in your case is when the engine is stopped, it takes quite a bit of energy to get that (relatively) heavy crankshaft/flywheel up to full cranking speed.

So, here are your choices:

Install a more powerful starter (more Kws)
Install compression releases
Learn to live with it

Sep 23, 2014 | 2009 Harley Davidson FLHTC Electra Glide...

1 Answer

My engine runs very hot when stuck in traffiic or at very slow speeds,the fan starts ok but it gets to the stage that the engine starts to miss fire,i have flushed the system and added Water Wetter but...


Your engine is getting hot enough to overheat the carburetors. That is why it is running poorly when it gets really hot. You have a classic problem normally only associated with air cooled engines. If you are in hot conditions, in stop and go traffic you have the same options as an air cooled bike. Turn it off and let it cool down (the fans will continue to run on most bikes) which will help but may run down the battery. The other option is to find another route that keeps you moving even if at in town speeds. If your mixture is set lean that can cause extra heat. If you have put on different exhaust pipes with out rejetting that can make you run lean/hotter. If you have opened the air box and put in a K&N air filter that can make you run lean/hot. If an oil cooler or bigger oil cooler is available that will help lower your engine temperature. Running synthetic engine oil and synthetic hypoid gear oil (in the final drive) will also lower engine temperatures. Try a spark plug one heat range colder. This is recommended in the owners manual for hot weather driving. Every little bit helps.

Sep 04, 2011 | Yamaha V-Max Motorcycles

1 Answer

My primary casing is very hot. What could be the reason?


The primary case will get hot as there are moving parts inside and it is directly connected to the engine. Check the oil level in your primary. Since you didn't tell me what year and model bike you have, stand the bike straight up. If it's a Big Twin, remove the round derby cover from the back end of the primary and look at the oil level inside. It should be just up to the bottom edge of the clutch outer drum. In the case of a Sportster, simply drain the primary by removing the drain plug under the lower backside of the primary. Remove the small round inspection cover at the top side of the primary cover and add one quart of oil.

Good Luck
Steve

Aug 25, 2011 | Harley Davidson FLSTN- FLSTNI Softail...

1 Answer

I want to know the oil level at a 1981 xlh harley 1000 when cold


Your dipstick should have two marks on it. The top mark is "FULL HOT" and the lower mark is "FULL COLD". Check the oil level with the bike on the side stand. My advice is to never add oil to the oil tank when the engine is cold. As long as you can see oil on the stick, ride the bike until it reaches operating temp and then add oil only when it's below the lower mark when hot. I never "top the oil off". The reason you never add oil to the tank when cold is that if the bike is not ridden for a period of time, the oil will seep by the check valve in the oil pump. It does this because the oil tank is located higher on the frame than the engine. The oil collects in the engine cases. If you "top the oil tank off", when the engine is started and it pumps the oil from the case into the tank, the tank is now overfilled. It will blow the filler cap out and oil will go everywhere making a big mess.

Good Luck
Steve

Jul 11, 2011 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

My goldwing over heats at parade speeds and we were in the Smokies it over heated and coming back expressway from maggie valley, nc going 70 mph and got hot first line below redline. I would like to...


Earlier models has a recall. http://www.ridersrally.com/sb/sb13.pdf It is possible a dealer might still be able to fix it under a "good will warranty" or at least sell you an updated ECM to turn the fans on at lower speeds when the engine starts to get hot.http://www.goldwingfacts.com/forums/forum1/31399.html

Jul 10, 2011 | 2004 Honda GL 1800 Gold Wing

3 Answers

Overwhelming heat coming from the back exhaust and cylinder from on a Ultra Classic Limited 103 inch engine. My thoughts are to replace the exhaust with a less restrictive exhaust such as a screaming...


I think replacing the exhaust will help, but it's an air cooled engine - they get fricking HOT! It's a very common issue with Harleys -just as it was with VWs back in the day. Replacing the exhaust will not void the warranty but it's not going to make a noticable difference - it may drop the temp a few degrees, but hot is hot. Your dealer might try to pull that "warranty is void" ****, but don't cave in - they are bluffing. They cannot void the warranty for this. Everyone changes their exhaust. If they persist, contact customer satisfaction and choose a different dealer.

You might look into putting a parade fan on - the bigger, the better. There are several to choose from and they help a great deal.

Also - Kuryakyn makes lexan heat shields which do help.

Jun 01, 2011 | 2011 Harley Davidson FLHTK Electra Glide...

1 Answer

What would cause the rear wheel on a kawasaki vn800 to lock up?


It could be that one of the Pistons in your engine have locked. This can happen if the motor chassis breaks, or the motor gets too hot and the piston expands due to the heat, gets stuck and damages the engines internals (and if unlucky the valves as well.

I had this happen to me once on the Highway. All of a sudden, the back wheel of my Aprilia blocked while I was going 70 Mph. Not a good experience. In my case it turned out the cooler had failed, and the engine overheated.

May 02, 2011 | 1998 kawasaki VN 800 Vulcan Classic

1 Answer

Broken muffler mounting bracket


all bolts need to be heated very hot with a map gas torch or hotter get all the part around the bolt hot too. hit your wrench with a hammer ( JAR THE BOLTS LOOSE) The pipes mAY HAVE to be loosened at the engine first to get them to move around enough the heat and beat them loose. A good welder can just weld the bracket and grind it with it installed as long as it in a place that doesnt show and the place can be covered or painted to look OK. The welded bracket will be better than a new one and not removeing the bolts will make the bike stay together longer without any problems.

May 21, 2010 | 2003 Harley Davidson FLHTCUI Electra Glide...

1 Answer

2006 road king engine heat


First of all, you need to install a temp gauge as, even if your motor is running within the red-line (below 300degF, preferably lower than 280) the exhaust can still be several hundred degrees. Even if you add most cooling units that claim to lower engine temperatures, lowering your engine temp as much as 20-40 degrees may lower the exhaust as much as 100 degrees or possibly a little more however, lowering exhaust pipe temps from 5-600 degrees down to 4-500 degrees is going to help your engine but, it is still going to produce a lot of heat radiating to the human body.
Have you tried the heat diverter panels that fit on both sides of the upper frame. they are made to divert heat away from your legs. Also, most of the Harley drill teams use a heat blanket that does the same thing. It works a little better but, it doesn't look quite as nice.
I have a new cooling system that actually does work well and is designed specifically for the conditions you described and it has worked wonderfully. It keeps the engine cool enough that the rear cylinder cut-out never even actuates. It completely eliminated the engine overheating issues. None the less, it is still hot on me even though I never hit the red line anymore. If your interested, I can give you the product name. I'll check this site occasionally to see if you respond.
Heat is one of those negatives that are going to occur when riding on an air-cooled bike with a V-twin as the pipes have to be mounted high under the rider. There are a couple companies that claim to produce internal ceramic pipes that supposedly removes nearly all heat down the pipe and out the rear yet, they will be very costly and I haven't heard any actual feedback from anyone using them so, it would be an expensive investment that may or may not remedy your issue.
Wish there was better news. If I had actual oil and/or engine temps to go on, I could possibly give you a better answer. Good luck..................Erik

May 28, 2009 | 2006 Harley Davidson FLHR Road king

3 Answers

Spark plug


have a look in the owners manual or i a workshop manual and somewere in there it will tell u the best plugs that should be put in the bike. if it continues in my experiences burnt out plugs means the engine is running to hot which means it is iver fuelling. if this is the case try turning the mixture screw down half a turn

Jan 01, 2009 | 2002 Yamaha YZ 426 F

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