Question about Yamaha YZ 450 F Motorcycles

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I have a 2001 banshee. took my cylinders to yamaha and there bored them out and did the rings i installed everything. has compression spark n air. fuels getting to the carbs but it still wont start. called yamaha and asked if it needed to be jetted and they said no. any ideas?

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Is the timing set properly? you might have an issue unrelated to the cylinder work....can you give me more information....what have you checked, and the exact symptoms....when you took the carb off, did you mess with the TPS ?

Posted on Apr 11, 2011

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1986 TRX 250 R has no compression, probably not rings or gaskets cuz there'd be some compression still !! Any ideas ??


A cylinder efficiency test would be the quick answer. Set the engine to top dead centre on the compression stroke if it is a 4-stroke or any top dead centre if it is two stroke. Lock the crankshaft or engage high gear and apply the brakes to prevent the engine rotating during the test (locking the crank is better). Jam the throttle open and remove the air filter.
Remove the spark plug and fit a commercially available adapter or a modified spark plug which allows compressed air to be fed into the cylinder without leaking.

Once the cylinder is fed with compressed air, leaks through the induction indicates a faulty inlet valve or seat, air escaping through the exhaust indicates similar problems with the exhaust valve or seat and more than the usual dribble of air escaping through the piston ring gaps indicates problems with the piston, rings or cylinder bore.

This type of test is quick and reliable and far superior to wet-and-dry compression testing but the diagnosis is slightly different for a 2-stroke as there are no valves but the process is quite intuitive and a valuable aid to fault finding but stick to low pressure on these engines..

Mar 14, 2015 | ATVs

1 Answer

1992 banshee starts up and dies and low compression how to tell if rings are bad


Pull the plugs and run a compression test . record readings . now squirt some oil into the spark plug holes and redo the compression test . record readings . if the compression was higer on the second test , the rings are bad , if not the valves are bad

Feb 24, 2014 | Yamaha Motorcycles

1 Answer

Yamaha dt125 won't start


Many piston compression (rather than oil) rings are uni-directional, and need to be installed with the proper side upward. The rings will have a "T" or "TOP" etched on the surface that needs to face upwards.
So my first question is, did you install the rings upside down?

Second, why did you replace the rings?
Did you measure the cylinder bore? Was it oversized, or out of round?
Is the bore worn enough that the piston is now too loose a fit?
Did you get the correct size rings? If you bored the cylinder, did you get the proper oversize rings?

Nov 20, 2013 | Yamaha Motorcycles

2 Answers

Why is my Yamaha Banshee is hard to start


It looks like your compression is too low (worn rings from dusted motor) Push starting spins the motor faster than kick starting and when hot the rings expand just enough to seal off. Before kicking a cold motor try putting in a squirt or two of engine oil in the plug hole to see if there is a difference.

Apr 26, 2013 | New Ray Ray 1/12 Yamaha YF 350Z Banshee 06

3 Answers

2003pontiac grand prix how compress the piston by compressing or by turn in ?


What you need to do is lift the car take out the wheel where crank shaft is,
also know as the harmonic balancer

Jan 20, 2013 | 2003 Pontiac Grand Prix

1 Answer

My banshee pushes coolant out of the overflow


Typically, with this type of problem , you are dealing with a leaking head gasket. Compressed gas and air from the compression stroke is forcing gas past the head o-ring or gasket into the coolant side of the cylinder. The expanding air bubble forces coolant past the cap causing the bottle to over flow.

Aug 16, 2010 | 2002 Yamaha TT-R 250

1 Answer

Yamaha banshee will not start


Did you accidentally cross the spark plug wires?
Other wise its going to be hard to diagnose,
Do you have plenty of compression,
Are you getting gas to the spark plugs?
Is the air filter clean/new?
You will need a factory service manual to diagnose further if all the above is ok

Jun 19, 2010 | 2008 Yamaha Yamaha G5

1 Answer

When is cylinder honing required? Replaced cylinder head on Yamaha TDR 125 (second hand part). When the bike is driven, power fails. New rings were fitted. Thanks, Dan


What is the compression on your scoot?
Honing is for small imperfections.If you can run your finger nail over Imperfection and it clicks or hangs up you need a BORE job..Honing is for very small issues. Seconhand parts also must be inspected and checked for wear.Mic the cylinder for proper specs. Please get back at me and Ill try to be of further service.

Jul 07, 2009 | 2001 Yamaha TDR 125

2 Answers

How much compresion should a 01 banshee have on each cylinder


The bike will still run even at 7:1 or a little lower, but the specifications call for about 10:1.

Feb 12, 2009 | 1986 Yamaha RD 350

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