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Hi, I have two impellers in my Challenger that I believe are very worn, almost nearly 138mm. I just bought two reman'd impellers trying to "save money" and they were roughly 139.2-5mm. If I were to buy a brand new impeller would it be exactly around 140mm? Thanks! Roughly I spent 240 for two...

I currently have a Challenger 5672 (14.5 ft with twin 720s), and I just came across a Challenger 1800 with twin 787s for a really good price. I'm considering swapping the 787s into my 5672. I know it's not a direct bolt-in, but since I wouldn’t need to hunt down two individual 787s or custom fab...

Long story short I bought a 95 XP with a good Electric box, VTS works, Gauges sorta work etc. Took the engine out. Bought a 96 GTI 720 engine that was REALLY mint; looks like it had under 10 hours honestly. Swapped it in without changing the mpem or anything. I do believe I used the exhaust...

Hi, I essentially had gotten at 1996 GTI motor I rebuilt and popped it into a 95 XP. I double checked the timing and carb settings and wearring(pretty tight) A.O.K. STILL has the 95 xp mpem!!!! Rpm gauge says it's hovering around 5-6000 ish rpm WOT but does not take off; feels really sluggish...

Hi. I have a Seadoo Challenger 5672 with twin 720's. The accelerator pumps are all sorts of messed up; (Needle, Pump, Spring and pin) I removed the spring and pin and bought Residual Press valves, and even new Needles. It's just not right. I know the engines were designed for it by really...

Hi, I have a 720 and a 657. Here’s my idea: I will create a shutoff valve between the hose that is sucking in seawater. Then, I will have a normal T setup to the hose connection. As long as the shutoff is on, I should be able to flush while in the water, correct? Usually, I can take the ski...

Hi, I have a 720 and a 657. Here’s my idea: I will create a shutoff valve between the hose that is sucking in seawater. Then, I will have a normal T setup to the hose connection. As long as the shutoff is on, I should be able to flush while in the water, correct? Usually, I can take the ski...

Adding Zinc Anodes to Older Sea-Doos I primarily ride in saltwater, and despite taking my engines apart this year to refresh them after last year's rebuild, cleaning, and painting, I still notice rust on certain parts. Where should I add zinc anodes?

Hi; I've worked on a several carbs now. Recalling from memory I've had three or four that have had this EXACT problem during pop-off leakdown testing. Essentially I'll get leakage from the top of the fuel body, where it touches the carb; right above where the fuel filter is placed. Sometimes a...

Mikuni Fuel Body / Check Valve Cleaning Question or SEA DOO 270500105 part. Hi; I tried searching on the forums for information but I couldn't. I have two or three fuel bodies lying around; I usually buy them rebuilt from osdmarine(BUT! they have limited supplies so....). My question is; I...

Hi everyone. How necessary is this system? Essentially when you turn the boat it accelerates the boat into the turn. Can I delete it without too much discomfort while driving? I will delete it by just directly running a throttle cable to the lever. My throttle cable is frayed. The cable from...

Hi everyone, bought two Jetski's early this year and started wrenching a month or so ago. I've worked on a lot of older motorcycle so I have some knowledge of engines etc. So far the 717 and 657 engines aren't that complicated. I was really surprised. I also learn what slipping and cavitation is...