I picked up 2005 trx450r the other week. Mods are as follows: Has a 06+ FCR carb and air box. Has a webcam grind # 961-962 CRF/ignition/stator/flywheel. CPcarillo 13.5:1 piston, Hinson clutch system and yosh full exhaust.
I have been having a starting issue with it. If the motor is cold it will take quite a few kicks to start and if it’s hot I can’t it to start at all.
First place I started with was the carb. I pulled the float bowl and it was pretty nasty. Ordered a rebuild kit and cleaned the entire carb. Also replaced the diaphragm as well. The needle is a ncvq needle. It is on the 4th notch from the top. The main jet is a 160 and the pilot is 45. The carb rebuild did not fix the start issue but it def was needed.
Next I went on to the valves and decompression mechanism. The exhaust valves were at .010 and the intakes were at .009. The decompression arm was at .024. Correct me if I am wrong but you get the decompression amount by adding the exhaust clearance to the clearance amount between the rocker arm and decompression mechanism. I believe for 04-05 it’s to be .017.
However I was reading on the forum how people say that you should set the decompression by hooking up a compression gauge. So I pulled the plug and did the compression test. It was only building up to about 60 psi. I then backed the screw out on the decompression mechanism, kicked it over a few more times and it got up to 90 psi. I did leave the compression gauge on for a little while and the pressure didn’t drop so I think I am good there. But that is where I stopped at for the evening until I can get some other peoples thoughts. I read on the forums that an electric start you set the compression at 90 but I could not find what you set a kicker model at.
Also I took some photos of the spark plug. It looks pretty dark to me. Also looks like it has some detonation on it. Can anybody give me some guidance? Is it running to lean? Do I need to bump up my jets?
Thank you for any help you can provide. Sorry for the lengthy post, just wanted to give you as much information as possible.
I have been having a starting issue with it. If the motor is cold it will take quite a few kicks to start and if it’s hot I can’t it to start at all.
First place I started with was the carb. I pulled the float bowl and it was pretty nasty. Ordered a rebuild kit and cleaned the entire carb. Also replaced the diaphragm as well. The needle is a ncvq needle. It is on the 4th notch from the top. The main jet is a 160 and the pilot is 45. The carb rebuild did not fix the start issue but it def was needed.
Next I went on to the valves and decompression mechanism. The exhaust valves were at .010 and the intakes were at .009. The decompression arm was at .024. Correct me if I am wrong but you get the decompression amount by adding the exhaust clearance to the clearance amount between the rocker arm and decompression mechanism. I believe for 04-05 it’s to be .017.
However I was reading on the forum how people say that you should set the decompression by hooking up a compression gauge. So I pulled the plug and did the compression test. It was only building up to about 60 psi. I then backed the screw out on the decompression mechanism, kicked it over a few more times and it got up to 90 psi. I did leave the compression gauge on for a little while and the pressure didn’t drop so I think I am good there. But that is where I stopped at for the evening until I can get some other peoples thoughts. I read on the forums that an electric start you set the compression at 90 but I could not find what you set a kicker model at.
Also I took some photos of the spark plug. It looks pretty dark to me. Also looks like it has some detonation on it. Can anybody give me some guidance? Is it running to lean? Do I need to bump up my jets?
Thank you for any help you can provide. Sorry for the lengthy post, just wanted to give you as much information as possible.