Engine Trouble very hard start,... feels like TO MUCH compression,...?

[heyscuba]

Hi all,....
my bike suddenly is VERY hard to start,...
I mean it starts right up once it pops, but I can peddle the heck out of it and even be going down hill a bit and pop the cluthch and normally right where it's been starting for the last year and a half it will just do nothing and grind me to a hault,.... eventually after about 4 tries i get it going and it runs great,....
but that first start and even after it's a little warm it is tough,....
feels like TO MUCH compression,...?
any idea's,...?

scuba

 

[Al.Fisherman]

Try adding a head gasket. That will be the easiest to start out with.

 

[Fabian]

Don't worry too much about the high comp. Within 600 miles, you will be wishing for some of that lost compression, as it evaporates on a daily basis.
If you have some basic tools (drill press and taps) an option is to install a chainsaw decompression device.

 

[TOTAL CARNAGE]

But why all of a sudden? On a year and a half old engine.
I can't think of anything that would increase compression. ( Except being flooded )
Maybe the compression is the same, it's just not starting right.......
I start with the simple stuff first. Check the plug. How old is it?
Try to start it with the plug out, laying on the head and check for a nice spark. If that all looks good move on to fuel.......Filter? dirty carb?
Most of my hard start problems have been spark related so I would start there. Let us know what you find!

 

[heyscuba]

Try adding a head gasket

Al,... Adding a head gasket,...?
you mean change out the stock head gasket,..? isn't it metal,..? are you suggesting going to a different type of gasket,..?
I'm not sure what you mean,..?
scuba

 

[double trouble]

not good news

I'd bet that your crank bearings/bushings are getting tight. Its on the slow way to failure. Try to pull the plug, disconnect the chain and see how easy the motor is to rotate with a socket wrench. I Have seen many motors that tighten before they blow. It is not compression you are feeling , its a tight connecting rod. Don't fret it could be quite a while before it lets go..

 

[TOTAL CARNAGE]

double trouble......would running a fuel mix with extra oil help lengthen the life of an engine like that or is it not worth it??

 

[heyscuba]

double trouble......would running a fuel mix with extra oil help lengthen the life of an engine like that or is it not worth it??

great question,... I asked my brother the same thing today,.... I am running 50 to 1, synthetic,...

 

[double trouble]

extra oil

That will not help , but running semi synthetic tc oil may lessen deposits and help.

 

[double trouble]

full synthetic

great question,... I asked my brother the same thing today,.... I am running 50 to 1, synthetic,...

This does depend on what brand you are running . Make sure the oil is jasco-tc or api-tc which is a semi-synthetic.
Do not run tcw-3 marine oils. They are meant for low speed operation and have properties that our little motors do not like. Too little ash, burns off at low flash point,and too much dispersant.
I doubt you are running full synthetic unless you use amsoil full synthetic. it is rated jasco-td. There are several other brands with this designation. They are great oils , but I think they are lacking some properties that these engines were designed for. These are dirty little motors that like real petroleum lubrication. Do you think that the Chinese who invented these motors have access to the selection of oils we do?
There is a reason that we can get 3000 miles out of one of these motors and lubrication is the main one.
I personally run a good chain saw oil that is rated tc. 40 or 50 to 1. Depends on your preferences.
Stihl, echo and husquvarna all make a great tc oil. Readily available at your local home center.
Almost all of it is made by citco anyway.
At one time yamalube, quicksilver and evinrude were too.
That should solve the mystery.