Yamaha 4 stroke gurus I have an issue

[DFBrews]

Bought an 04 ttr225 to putz around on street legal which is a plus bike has been sitting since may so pulled the carb apart cleaned the varnish out new fuel got it running but when I was running around on it at wide open throttle it falls on its face almost feels like it has a rev limiter set really low rpms

the next bigger issue is when idling after I got it hot there was a horrible screech coming from the engine I know the sound... Heard it before 4 times right before a piston stuck on a Diesel engine during a dyno... Oil level was low topped it off pulled the oil pressure check port on the head and I am not getting oil pressure to the head squirted some oil into the cylinder and the oil hole. Motor quieted down quite a bit.

I am going to try a new oil and filter first if that does not work I am at a loss as to what the issue could be any ideas

[Goodburbon]

Bought an 04 ttr225 to putz around on street legal which is a plus bike has been sitting since may so pulled the carb apart cleaned the varnish out new fuel got it running but when I was running around on it at wide open throttle it falls on its face almost feels like it has a rev limiter set really low rpms

the next bigger issue is when idling after I got it hot there was a horrible screech coming from the engine I know the sound... Heard it before 4 times right before a piston stuck on a Diesel engine during a dyno... Oil level was low topped it off pulled the oil pressure check port on the head and I am not getting oil pressure to the head squirted some oil into the cylinder and the oil hole. Motor quieted down quite a bit.

I am going to try a new oil and filter first if that does not work I am at a loss as to what the issue could be any ideas

Could be a plugged oil passage. Try the ole flush with diesel routine. As for high RPM problemput in a fresh plug.

Ive got an 07, we should putz around on the trails some day.

[TFOGGER]

If it falls on it's face at high RPM/full throttle, it's probably going rich. Check to make sure the air filter is not restricted, check to make sure the main jet air bleed in the carb is not plugged, and check the main jet to make sure it is tight, and the correct size(130 is stock). If the restrictor is still in the exhaust, you may need to go down a couple of sizes to get it to pull cleanly to redline.

[DFBrews]

Thanks burbon going to soak it in fuel
The air filter is cleaned and freshly oiled may have been too fresh actually but my plug is a good tan color

Tfogg what do you think of the oil pressure thing

[ray1970]

Make sure some dipshit didn't put the oil filter in backwards. That will kill the oil pressure. As far as the WOT bogging, my first guess would be to check the needle and make sure the dipshit that might have put the oil filter in backwards didn't screw with the clip position. WOT is only controlled by the main jet and the needle.

[TFOGGER]

Thanks burbon going to soak it in fuel
The air filter is cleaned and freshly oiled may have been too fresh actually but my plug is a good tan color

Tfogg what do you think of the oil pressure thing

They don't make a ton of pressure, but you might want to pull the valve inspection cover and make sure there is oil getting to the top end. As Ray said, check to make sure the oil filter is oriented correctly, and the cover is clocked so the passage holes line up(hard to screw up, but check anyway). The oil pump gear is plastic in most of these, and can strip if the pump seizes or gets jammed with debris.

[colorider]

If there was varnish in the carb, I can guaranty that your jets are jammed up w crap. Especially the pilot jet. Just replace them. That way you know they are clean and good to go. Do an oil change and make dang sure to use motorcycle specific oil that has NO friction modifiers. It is a wet clutch system and normal motor oil will cause clutch problems.

[DFBrews]

Just drained the oil and pulled the oil filter it was covered in crap... Ran solvent through the passage that runs through the head and after some persuasion got some to come out of the supply hole so it might have been plugged. Sadly no one is open tomorrow unless tfog carries the filter???

[King]

does it backfire?

[Goodburbon]

I don't know what the deal is with MC shops being closed on Mondays, but it's invariably timed like my cravings for Chic-fil-A.
I ALWAYS want or need to go when they're closed..


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[DFBrews]

does it backfire?
Nope idles great bogs hard at wot which may be something I did when I pulled the carb apart

[Jmetz]

Sounds like jetting. As previously stated if you didn't remove and clean the jets, they are probably clogged.

[DFBrews]

I pulled all the jets out and cleaned quite well them not my first time playing with a mikuni carb and its tiny little passages had a 79 Suzuki 750 with 4 of them grrr

[King]

Sounds like jetting. As previously stated if you didn't remove and clean the jets, they are probably clogged.

I agree

[Great-Kazoo]

Nope idles great bogs hard at wot which may be something I did when I pulled the carb apart

You replace the fuel lines? Sometimes the most head scratching problem has the simplest fix, especially if it's been sitting. What's another $4-5 in line? ALSO one other area that causes loss of power is the petcock. Sediment, gunk, broke down fuel line shit can clog the screen just enough to restrict fuel.

[clublights]

Bike shops are traditionally closed on mondays so the employees can have two days off.. since they are traditionally open on saturdays too ...


Esp since they are often mom and pop type operations ( like Tfogs) there are no days off when you are open . Besides... monday day rides in the mountains RULE.. less traffic

[TAR31]

carb have an accelerator pump? spent too much time in the past chasing ap probs. If not check for air leaks on the intake boot. Valve adjustment always a good idea also.


\ Do an oil change and make dang sure to use motorcycle specific oil that has NO friction modifiers. It is a wet clutch system and normal motor oil will cause clutch problems.
Rotella 15-40 (diesel engine oil) is one of the best oils you can run in a wet clutch motor. No friction modifiers and high in zinc. My engine builder recommended it to me and the race motor in my quad has lasted much longer than I expected running it.

[Raul Duke]

I'm a KTM guy, so I cant speak to the TTR specifically but I can give you some thoughts to try. Start by getting that oil circuit working correctly - without a good amount of oil on the top end it will be an expensive repair. As for the bog, it kinda sounds like it is starving for fuel due to the color of the plug. 1 thing to check quick is the float (double check ist not upside down) and the needle level. Another thing you may want to check - maybe even before the float level - is remove the bowl, float and needle valve and with a catch pan under the carb bottom and turn the petcock on and see what kind of flow you have. If its not flowing well, check the petcock/tank screen and also check if your model carb has the small screen where the inlet circuit comes from the hose to the needle valve seat. Some have it, some don't. If its been sitting for a while it may be good to check. One last thing to check is the air/fuel screw on the bottom, if I'm not mistaken, stock setting would have been 1 1/4 turns out from all the way in which should be a good starting point. Just some thoughts - good luck!

[Goodburbon]

I think the air fuel screw on these have to be drilled out and turned 3 turns on this bike or something weird to be adjusted. I haven't done it yet.

A good place to start

http://www.xt225.com/forums/ubbthreads.php?ubb=postlist&Board=3&page=1



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[Raul Duke]

Do the '04 still have the brass cover over the screw - I thought the newer models did away with them? #34 is the pilot screw. Stock setting is 1 1/4 out. #31 is the needle valve set - the top half round piece is the screen I was talking about. http://www.boats.net/parts/search/Yamaha/Motorcycle/2004/TT-R225%20-%20TTR225SC/CARBURETOR/parts.html Yes, its a boat site, but has a good diagram of the correct carb.