Yamaha blaster wont rev up sputters past 1/4 throttle
I have been trying to help a buddy out with his blaster it has a stock motor , air box delete just a filter off the intake, has a full fmf pipe and expansion chamber. ive alreadly done a dynojet carb kit with a 360 jet, ive tried multiple jets to see what would work no change in problem, ive replaced every part in the carb, deleted the oil injection and pre mixed fuel. and ive completey replaced carb with another one and still no change . also replaced plug
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If you have fuel injection, I think you do have a "tip-over" or angle switch..(they will keep running upside down)..IF NOT - Sounds like you may have filled the engine with gas and possibly flooded the air filter also.....- when you tip it over, there is nothing to stop the fuel from flowing through the carburetor vent systems and into the intake tract (engine and air filter).. when this happens it floods so bad you have to remove the air filter and spark plug.. then spin the motor over.. make sure the air filter is clean and dry..
... Install a new spark plug..
Check that the breather in the fuel cap is still working. The breather has a hose with a one way valve.
You should be able to blow air in but not out. I hope that you are moving during that 1/2 hour as these motors require air flow for cooling.
The VTX 1800 is fuel injected which requires the additional sensors (oxygen, throttle position, etc). However the VTX 1300 is carbureted, which takes the sensors out of the equation. If you are changing the exhaust with a:
remove old mufflers, and slip on new ones
could add a better air filter, and you get a better sound, minimal power gain
Full Exhaust System
Remove old pipes from the cylinder heads (i.e. jugs) and use a rag to wipe off the seat and block the opening.
once both pipes have been pulled from the jugs, prep your new pipes with windex. Clean them well, finger oil and other gunk can cause bluing spots
Install the pipes, torque them in place, re-clean the pipes and use a chrome polish.
Purchase carburetor jetting kit, and either take it to a shop to do it, or you do it. If you have never re-jetted a carburetor before, I suggest you go to a reputable shop and get it done.
With the carb completed, a new air filter (high flow K&N is what I use - I have gone through the same exhaust system replacement procedure on my sled)
If you replace the exhaust without completing the carb/air cleaner, there is a very high probability that you will get backfires every time you ride. This will happen especially on deceleration, and will eventually blow out your valve seat, causing the engine to feel weak due to lost compression.