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

[heyscuba]

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.

I am using MasterPro
with fuel stabilizer,
(part #80017)
made for weed whackers, chain saw and blowers by the pic on the front of the bottle,...
I can't tell anything else from this bottle,...

 

[Fabian]

double-trouble is right. At 40:1 or 50:1 you need to run a quality oil designed for an air cooled engine, but if running 20:1, use any kind of oil you want.

 

[motorpsycho]

it sounds to me like possibly, it's getting hydro-locked.
POSSIBLY, the carb is slowly allowing gas to leak into the engine while the bike sits.
when you go to start it, this excess fuel is slightly hydrolocking the piston, which will make it VERY hard to start.
I don't think that bearings can become "tight" unless they have not gotten any oil in a long time.
usually. bearing will get loose from wear, but they could bind up from lack of oil.
this is just a possibility.

Pull the spark plug out and try to start it as you normally would. this will release the compression and tell you if it's a compression issue or a possible bearing issue.
if it spins over easy with the plug removed, then you have something going on compression or possibly spark related.
It is possible that a large amount of carbon is built up on top pf the piston, which would raise the compression.
BUT, it would take quite a bit of carbon for it to raise the compression to the point to where it's hard to start.
i'd pull the head off and look at the top of the piston.
if there's a thick build up of carbon on the top of the piston, you can remove it with a little wire wheel in a dremel tool.

 

[motorpsycho]

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.

the chinese didn't invent these motors, the russians did.

 

[Al.Fisherman]

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

Sometimes, like I had to do was to add another head gasket to the one already there. (running 2 head gaskets) to decrease the compression.

 

[wbuttry]

my motor calls for 5.5 ounces i use 6 for safety and suba and it colud be just like the rest of us it is just getting old and and needs to be replaced if you got a year and a half you are doing good most only last a couple months i got a 49cc 3 yrs old and runs real good but thats cause it isnt on a bike rite now

 

[double trouble]

i stand corrected

the chinese didn't invent these motors, the russians did.

The Russians invented them in the 1940's and as usual the Chinese cloned them in the 1960's. The motors we buy have little resemblance to the Russian design.
As far as a tight motor. I have seen many motors , from v-8's to weed wackers that tighten up from bad bearings. Yours could be a compression issue , but don't be surprised if the little fellah locks up.

 

[double trouble]

Masterpro= Pureguard

I am using MasterPro
with fuel stabilizer,
(part #80017)
made for weed whackers, chain saw and blowers by the pic on the front of the bottle,...
I can't tell anything else from this bottle,...

Pureguard is generic petro oil. Omni specialty packaging from Shreveport La. They use Lubrizol additives. Not synthetic from the MSDS that I could find.
It took a lot of research to find it.
Not horrible , but there are lots better choices.
Switch to a TC oil.

https://docs.google.com/viewer?a=v&...90BOGM&sig=AHIEtbQ3h1xlg769Fj0UJujTDgKdtWT9_A