I have a 98 GTI that has no snappy power. Almost everything new. It starts good and seem to rev up good on the trailer but in the water it just feels slugging and when I first went out it would get up to 15 to 20 mph but after riding a bit would only get up to 10 to 15 mph. It seem to run ok and smooth but low power. A couple time when idling it would pop and stall. But mostly runs and idles good. I think it may be something electrical but don’t want to just buy an MPEM for nothing. One odd thing I came across when testing the voltage regulator/rectifier. I have 13.6 + volts from the regulator to the MPEM but when I check the voltage at the battery with engine running it was only 12.6.So it appears like the power is not getting through the MPEM to charge the battery. Also the fuel gauge isn’t working. I don’t know it that’s related. This is what I have done
- rebuilt engine from SBT
- new rotary valve and cover to spec
- rebuilt carb. Also bought new carb and same problem.
- replaced all fuel lines and cleaned selector.
- jet pump seems good and replaced wear ring.
- swapped coil and plugs from other matching.

any help or advise from you wizards here would be greatly appreciated

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I believe the MPEM is OEM but a diode was replaced in it a couple years ago. I guess I may have to try a new MPEM next or pull the carb again. Hopefully the video will help with diagnosis. Here is a link to a video of the machine running. I rev it up good and then slowly turn down the idle until it pops and stalls.perhaps it is running rich. It does seem to smoke a lot.

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