Mikuni BN 40I throttle shaft for 2001 Seadoo GTI

[Bigharv]

Hello - I am looking to find a replacement throttle shaft for a Mikuni BN 40I carb. In the SBN manual I have found they have kits available for the 38, 44, and 46. Being that mine is a 40mm, I am not sure if any of these would work. I really don't need the butterfly valve but I would buy the whole kit just for the shafts if they will work.
The kit numbers are:
MK-BN/038 TV
MK-BN/044 TV
MK-BN/046 TV

Does anyone know if any of the above shafts would work for my carb?
Thanks

 

[Dr Honda]

nope... you need the one for that carb.

Just an FYI... it's very hard to just replace the shaft, without damaging the body, bushings or shaft seals. What happened that it needs replaced?

 

[Bigharv]

Thanks Dr, that is what I expected. I was rebuilding the carbs on both my 2001 GTI's and in the process I decided to pull the throttle and choke plates since the screws were starting to corrode badly. In the process of trying to remove the screws the phillips head stripped and the only way I was able to get the screws out was to drill through. I attempted to use vice grips to get it to turn and ended up bending the shank which caused me to be unable to get a good center drill on one of the screws. One screw center drilled out perfectly and the replacement screws went in nice and snug, but the other hole is now wide open. My solution is going to be to get a little bit larger/longer cap screw and use a jam nut or locking nut on the back side. I don't like the idea of having the carb throat cross section obstructed like that, but I think the effect will be rather minimal.

 

[mikidymac]

For the money I would buy a brand new carb from OSD. I had issues with my 2003 GTI and rebuild the carb many times before I just followed the advice here and bought a new carb. Best $200 I ever spent on the GTI.

 

[Bigharv]

What specific issues did you have with the carb (BN40I)? I have not had any real performance issues with the carbs other than recently they started to deteriorate. The carbs hadn't been touched since new and the seadoos really never had many hours on them. I recently started using them more the past 2 seasons and noticed a slow performance decrease over time until the last time i took them out i was having surging at WOT and never really able to hit top RPM. I read about the fuel line issue and decided to overhaul the carbs and replace all the lines. The internal fuel filter was completely covered in black gunk which I am attributing the performance issue to but the rest of the carb was in very good shape besides some minor corrosion on the threaded fasteners. I would really prefer not to drop 200 dollars on new carbs(2 skis) unless absolutely necessary. These skis have been very reliable with the existing carbs.

 

[mikidymac]

Mine had a little hesitation but it was a California factory sealed carb so you couldn't get the high and low screws out to clean. I drilled the caps out and cleaned it a few times with new parts but it never ran great. I bit the bullet and with the new carb it has been perfect.

Please don't tell the California Air Resource Board.