91 Yamaha 150 pro V 6 cylinder 2 stroke will not go above 2200 RPM.

[new2this802]

Not getting going above 22000 rpm at full throttle. im looking for a base line as to were to start. i checked the spark and spark is good on all 6 plugs and wires. checked to make sure the butterfly valves in the cabs are fully opening and they are. Is the primer ball supposed to be soft or remain hard during running? i also checked to make sure oil resivoir is full and it is.the model for this motor is P150TLRP. on a side note i did a little expiremeant playing with the choke switch and it came up to plain but only running 29000-30000 RPM at full throttle had to hit the choke every 5 to 10 seconds to keep it going though.

 

[99yam40]

Not getting going above 22000 rpm at full throttle. im looking for a base line as to were to start. i checked the spark and spark is good on all 6 plugs and wires. checked to make sure the butterfly valves in the cabs are fully opening and they are. Is the primer ball supposed to be soft or remain hard during running? i also checked to make sure oil resivoir is full and it is.the model for this motor is P150TLRP. on a side note i did a little expiremeant playing with the choke switch and it came up to plain but only running 29000-30000 RPM at full throttle had to hit the choke every 5 to 10 seconds to keep it going though.

from what I have seen, these motors are not suppose to run above 5500 RPM
getting up to 30000 or above should never happen

but it sounds like your carbs need cleaning

 

[new2this802]

right u are ill have to do an edit i done put to many 0's.Not getting going above 2200 rpm at full throttle. im looking for a base line as to were to start. i checked the spark and spark is good on all 6 plugs and wires. checked to make sure the butterfly valves in the cabs are fully opening and they are. Is the primer ball supposed to be soft or remain hard during running? i also checked to make sure oil resivoir is full and it is.the model for this motor is P150TLRP. on a side note i did a little expiremeant playing with the choke switch and it came up to plain but only running 2900-3000 RPM at full throttle had to hit the choke every 5 to 10 seconds to keep it going though.

 

[new2this802]

ive never done a carb job im currently searching for videos on how to dissect a double barrel Nikki carb and re-assemble.

 

[new2this802]

pulled the carbs. havant cleaned them up yet but there off the engine still havant found a vid on how to do it is nikki not the name of these carb?

 

[ondarvr]

It's not hard to do, nothing in there to really scare you, most carbs are fairly close in design, so if you can't find a video for this one just look at whatever video you can find that's close.

 

[new2this802]

pulled all carbs gave them a thero cleaning and reinstalled got a new primer ball to toss on it, gonna hit the water here soon see if i may have fixed it. ill give you all an update on what ive found out. Thank you.

 

[99yam40]

the service manual will have the procedures for link and sync when putting the carbs back on along with the specs to set it

 

[new2this802]

the carb cleaning did the trick oh boy does she rip now. for the reinstall i took about a dozen pictures before i took them off and marked them top middle bottom so they went back on the same way they came off. thanks again guys.