GSX-R 250 Throttle problem

[Blakamin]

Finally heard back from the mechanic, hes says its not compressing. and it will take about $600 in labour not including anything that needs replacing. What exactly does this mean? and is it something i could do myself with a workshop manual and a bit of time?

Top end rebuild.... sounds like your rings are...F&^%ed

[Hitman]

What does it cost for new valves and rings?

[FROSTY:Me]

The most common compression issies with the gsxr250 is either -badly set tappets or worn tappets needing a valve grind. Its much less common for the problem to be the rings. -Ya valves have heads not much bigger thab a 5x piece and have to open and close sometimes 14000 times a minute.
That said I would follow celtics advise first.
Id suggest hauling the plugs out and check em for color-if 2 ar black and wet/sooty and two are a good color then you'll know which cylinders are at fault. I'd as a matter of course toss a new set of plugs in.
Give the carbs a bbloody good clean out -blow out ALL of the jets and make sure the choke is operating properly.
Id maybee suggest winding all your mixture screws in tight then back em off 1.5 turns.
good luck dude

[Hitman]

Cheers XJ/Frosty

Just took the air filter and carb off, will check the carb out tomorrow, and maybe take the engine block out, c how the carb goes first.

How can i tell if the chokes stuck on?

I got the pressure readings from the cylinders, 65, 70, 65, 60 PSI, less than 1/2 of what they should be.

[Kickaha]

Cheers XJ/Frosty

Just took the air filter and carb off, will check the carb out tomorrow, and maybe take the engine block out, c how the carb goes first.

How can i tell if the chokes stuck on?

I got the pressure readings from the cylinders, 65, 70, 65, 60 PSI, less than 1/2 of what they should be.

Who did the compression test was it you or the shop?
It should be performed with the engine warm and full throttle(well thats how I was taught) and after its checked if you squirt some oil down the plug hole and recheck it the reading goes up then it indicates worn rings if there's no changes it's valves

[Hitman]

A shop did it for me, i asked if it was the rings or the valves but he just said i wouldnt know till i got the head off. Also i think its pretty common for 250's to get the valves covered in carbon and loose a good seal that way. Borrowed an engine winch of a mate today and well take out the engine block tomorrow. It wont cost me anything to check the valves anyway cause im doing it myself.