newtomedoo22
Member
Good Morning everyone! New guy here asking for some advice.. I find myself in possession of two identical 01 gtx machines and I wonder what my next steps should be. Here is some background:
unit#1 has 120 psi compression on both cylinders. This measurement was taken with the machine cold, wot and with a new otc tester. I told a look inside the cylinders with a scope and there is carbon build-up on the top of the piston with small bare patches around the diameter. machine starts and runs fine on the trailer.
unit#2 has 130 psi on the mag side and 100-105 psi on the pto side. This one also has carbon buildup as the other and was tested in the same way. It also starts and runs fine on the trailer.
I have not had either of these in the water and am hesitant to do so after reading numerous threads on this forum. In one respect I would like to at least take them out and try them to see how they do before I start messing with them too much but on the other hand I don't want to cause any damage before maintenance is done.
As I see it the to do list should be:
rebuilding the carbs with genuine mikuni kits reusing original springs and replacement of fuel lines and filter with pressure testing of the carbs and fuel system
replacement of the oil lines....both machines have an unidentified blue green oil in the tanks. One of the tanks was replaced and I have a spare.
removal of the oil filter and replace the seal in the bottom of the oil tank
cleaning of the rave valves
Do not delete the oil pump but premix the gas 40:1 with seadoo oil and a dose of ring-free for good measure
The previous owner claimed to have used half a bottle of marvel mystery oil in each tank of gas, maybe the cause of carbon or are they just running lean?
I have seen on you-tube where someone removed the cylinder head and soaked the pistons with wd-40 and then lightly scraped them with a wooden scraper and light scrubbing with a scotch brite pad...Is there any point to that? May or may not affect the compression?
Guys..I need all the advice and encouragement I can get. Thank You for any and all replies..
unit#1 has 120 psi compression on both cylinders. This measurement was taken with the machine cold, wot and with a new otc tester. I told a look inside the cylinders with a scope and there is carbon build-up on the top of the piston with small bare patches around the diameter. machine starts and runs fine on the trailer.
unit#2 has 130 psi on the mag side and 100-105 psi on the pto side. This one also has carbon buildup as the other and was tested in the same way. It also starts and runs fine on the trailer.
I have not had either of these in the water and am hesitant to do so after reading numerous threads on this forum. In one respect I would like to at least take them out and try them to see how they do before I start messing with them too much but on the other hand I don't want to cause any damage before maintenance is done.
As I see it the to do list should be:
rebuilding the carbs with genuine mikuni kits reusing original springs and replacement of fuel lines and filter with pressure testing of the carbs and fuel system
replacement of the oil lines....both machines have an unidentified blue green oil in the tanks. One of the tanks was replaced and I have a spare.
removal of the oil filter and replace the seal in the bottom of the oil tank
cleaning of the rave valves
Do not delete the oil pump but premix the gas 40:1 with seadoo oil and a dose of ring-free for good measure
The previous owner claimed to have used half a bottle of marvel mystery oil in each tank of gas, maybe the cause of carbon or are they just running lean?
I have seen on you-tube where someone removed the cylinder head and soaked the pistons with wd-40 and then lightly scraped them with a wooden scraper and light scrubbing with a scotch brite pad...Is there any point to that? May or may not affect the compression?
Guys..I need all the advice and encouragement I can get. Thank You for any and all replies..
Last edited: