Question about 2003 Honda CBX 250 TWister

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2007 cbx 250 twister bike smoke when it idel , i replaced valve stem seals but still same problem is it possible that it can be the type of petrol (93 unleaded)in use in the bike.a new head gasket was replaced. If the head was damaged would it cause the bike to smoke the bike have over 4000km om speedometer thanks

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The piston rings are bad. If scarred up, the piston needs to be replaced and the cylinder may need a re-bore.

Posted on Sep 14, 2010

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My 2007 Honda rancher 4x4 smokes bad, but has plenty of power what could this be


Normally there are three culprits to excessive smoke:

1. Cylinder or Piston Problems
2. Worn Valve Guides or
3. Worn Valve Seals** - there are seals that go around the valve stem at the top of the engine. Oil is pumped up to the top and dumped on top of the valve springs and the rocker assemblies to be lubricated. The stem on the valve has a seal - to prevent this oil from leaking down into the combustion chamber - forcing it to follow the proper route back into the crankcase. If your valve seals are shot - oil bypasses these seals and enters the combustion chamber - thereby creating excess smoke because you're now burning oil with the air/gas. Definitely could be possible - here's a diagram of the parts and a page that lists the three reasons for excessive smoke in 04-07 Ranchers. Hope this helps - good luck.

All The Best, Justin McCartney
2007-honda-rancher-4x4-smokes-bad-but-2mxge42kl42e5tx0bsno1lhz-3-0.png

2007-honda-rancher-4x4-smokes-bad-but-2mxge42kl42e5tx0bsno1lhz-3-2.png

Nov 29, 2015 | ATVs

1 Answer

My Bike emits Bluish Smoke at Start Up and then at Deceleration.


OK, since you didn't mention a make model, year or number of cylinders this is just an old mechanics take on the situation. Blue smoke on deceleration (closing the throttle) is because of high vacuum in the cylinder pulling oil past either the piston rings or valve seals. Usually, blue smoke on a cold start is caused by the valve seals leaking into the cylinder while the bike is sitting. A quick check to see if the piston rings are at fault would be either to come down a long steep hill or accelerate hard then close the throttle, if it emits a sizable amount of blue smoke when you open the throttle again, the rings are most likly at fault.
The oil getting black is it doing it's job of keeping the engine clean, and the oil consumption you mention would not necessarily be cause for concern on an air cooled engine, especially in a warm climate. Is it possible this condition existed before all this work was done? If so, I'd suspect a carburetor problem, an over rich mixture, possibly because of a faulty float valve or the float itself contaminating the oil with raw fuel, especially if the bike is left on the side stand without the petcock being turned off.
To sum things up, a leak down test will show the condition of the rings and valves. Also might mention that if newer type (usually blue or green color) valve stem seals were used, there is a special procedure for installing them not all mechanics are aware of. The valve must be put in the guide first and the seal worked over the stem with the thumb then it can be tapped down onto the guide. Hope some of this helps, Frank

Nov 02, 2014 | 2006 Hero Honda Karizma

1 Answer

How to unlock the seat of the cbx twister 250?


Hi, Anonymous for this scenario you will need your service, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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1 Answer

How to remove spark plug from honda cbx 250 1986


Hi, Anonymous for this scenario you will need your service, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
How to remove spark plug from honda cbx 250 1986 Google Search
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Honda CBX250 Twister Owner Manual

Apr 10, 2014 | 1987 Honda CBX 250

1 Answer

Honda cbx 250 2008 Model, clocks keep resetting


Hi, Chris for this scenario you will need your service, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
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Apr 11, 2013 | 2006 Honda CBX 250 Twister

1 Answer

Cbx 1000 1982 is it possible to change valve stem seals with out taking head off ta


Not really. Once the valve cover, oil line, intake and exhaust cams, and shims are removed you are looking at the top of the valve stem. The valve needs to be held up against the head to take off the valve keepers, the stepped disk and the two springs. The valve stem seal is way in there behind everything mentioned previously. If you could jam the valve against the head to remove the valve keepers etc. then you would have to do the reverse to replace everything after putting new seals on. You would have to do this 24 times, rotating the cylinders just right to get to TDC. The chances of completing this without bending a valve or ever being able to run the motor without always expecting an imminent catastrophic failure would be about zero.
(However, if you were planning on selling it to someone you were not ever going to meet again in this life or the the next - well ok then).

My apologies.

Dec 01, 2011 | Honda Motorcycles

2 Answers

My fiesta 1.6 zetec 16v is blowing blue smoke with strong odour of petrol ,what is wrong with it ?


Hi

it sounds like it is burning oil not petrol but you will smell petrol as the oil is leaking in through the head, the valve stem oil seals will most likely have gone, very common on fords. they are very cheap bt unfortunately you have to remove the cylinder head to replace them so that means a head gasket and a new cambelt and head bolts thats where it gets expensive. in the UK you are looking at about £300 to £500 in a general garage.

there is another solution that will last for months if not years, get some STP the type that you need to heat up to get it to come out of the can, this will seal up the leaking stems and shuld stop the smoke, most people do this before they sell that car.

Valve stem oil seals often go because the car has been driven hard, but you should still expect them to go at around 80-100k miles anyway.

Hope this helps
Regards

Dan

Dec 28, 2010 | Ford Fiesta Cars & Trucks

1 Answer

Hi, can you help me?? i am looking for the valve clearance gaps for a 2008 honda cbx 250 twister. my current gaps are, ex = 0.10mm and , in = 0.12.... please help, it doesnt sound right


Your valves are adjusted backwards. Most Honda's will use: IN = 0.10 mm ( 0.004 in ) and EX 0.12 mm ( 0.005 in ) A simple adjustment should take care of the problem.

Oct 15, 2010 | 2001 Honda CBX 250 TWister

1 Answer

Jerking


check your spark plug gape

Mar 11, 2009 | 2001 Honda CBX 250 TWister

1 Answer

I want to convert my motorbike like a sports cruiser


Your best bet is to custom make or adapt other parts to your bike. the best way if you are not used to doing this is to pic up a cheap parts bike that is more like where you want you bike to be when you are complete and start swapping and adapting parts till you start getting the results you want!

Dec 30, 2008 | 2001 Honda CBX 250 TWister

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