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I am looking for a set of used carbs or a throttle plate out of a 1997 Seadoo Challenger 1800 challenger. The carb numbers are Mikuni BN40i-38 and the brass throttle plate needs to read the number (140). Cannot use throttle plates that read 130 or 150. Message me if you have any laying...

Anyone have a set off the stated models? 1997 XP GTX CHALLENGER 1800 SP

Wasn't aware I can swap with those models. My carbs are fine just have (1) damaged throttle valve and called Mikuni about it. They said they never imported replacement slides for the 97 seadoo challenger 1800 which is a Super BN40i-38-26.

Yeah but the throttle valves are different. The 97 Challenger 1800 carbs have 140 stamped on them and the GTX or SPX carbs have 150 stamped on theirs and are different sizes!

Looking for a set of carbs for a 1997 Seadoo Challenger 1800 jetboat. I am specifically looking for the PTO carb OR PTO Throttle Valve. Please PM me if you know anyone who may have a carb or set of carbs laying around for this boat!

Bump still looking!

I only have one motor reading RPM's on my challenger 1800. Switched the plugs behind the gauge console and confirmed both RPM gauges do light up and read RPM when connected to my starboard motor however port motor will not catch a reading on the RPM gauge. I Just rebuilt this Port motor-...

Thanks for the feedback everyone!

The bad accel pump diaphragm (that tested OK at 4psi) was definitely my problem in this particular case!!! I ordered the recharge jets however have not installed them yet and boat ran great. Motor has not fallen on its face after 5-10 seconds at 1/2-full throttle once since replacing it with...

Yes however the bad diaphragm shows no tears and still passes 4 psi pressure check.... I replaced it with the diaphragm from the working carb and the accel pump operation corrected leading me to the conclusion that even though it looks OK it is still a bad diaphragm. I rebuilt these...

Need a new accelerator diaphragm for a Mikuni carb off a 97 seadoo challenger. If anyone has one laying around please PM me!

**Update** Swapped Diaphragm from working accel pump PTO carb to other PTO carb and found that its the diaphragm thats the problem. Although my diaphragm shows no tears or serious wear and also PASSES the 4psi manual check, it seems to be bad. Man o man this cost me a lot of thinking hours.

I changed out the old lines that were installed and read on a few posts I researched on here about a small part in the old fuel line (seems like an inline pressure regulator) I may be missing... It is called a Recharge Jet Accelerator Pump part # 270500348. I did not see this part in the...

I have noticed while blowing and sucking into the accel pump fuel feed nipple (Blue line attached) that it blows/sucks both ways. However I see no mention about this being a check valve in the manual. Should this nipple only suck in vacuum?

So I tried the manually moving the lever with my hand and it no longer is pulling fuel through the red line to the inlet fitting and is NOT squirting fuel. Diaphragm does hold 4psi and check valve in the inlet nipple tests ok by mouth (blow air in however cannot vacuum air out). I have found a...

He did not Pm'ed

I freshly rebuilt two carbs on my motor and am having issues with the accelerator pump on my PTO carb. I have a challenger 1800 with the twin 787 motors with the Mikuni 40i-38 Carbs. I have checked all check valves and made sure none of the small nipples are obstructed. Accelerator Pump...

Still looking! Anyone?

The C clip that holds tension on the spring was out of its groove and alongside the other c clip. Going to replace both c clips and order new brass gear. Thanks a lot for the detailed pics!

So I just rebuilt the twin 787 motors in my Seadoo Challenger 1800 and went out for my first test run this past weekend. One of the motors wouldn't rev up past 3000 and was blubbering the whole time as if timing was off. I knew my countershaft and crank was timed correctly so I checked the...