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what rpms do you guys get out of your xp 787 stock?
- Thread starter glsmohio
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glsmohio
Well-Known Member
I will check that out tonight. I rebuilt the engine and it has 25 hours on it.
Dr Honda
Well-Known Member
You rebuilt... or a shop?
If it was you... did you check the squash band? Did you replace the rotary valve, and cover? Did you get the cyl wall clearance set properly?
glsmohio
Well-Known Member
I did it all my self, and yes i did do all that properly (i hope) lol. I did put a finger throttle on at the start of summer and i wonder if im not getting full pull of that. Im going to check the compression tonight and then check the throttle.
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glsmohio
Well-Known Member
lol, fun and games
glsmohio
Well-Known Member
by the way, i was getting the 7000 rpms but the last 2 hrs they droped off. i was at the beach and i think i picked something up. ran it through the pump and i checked it out and it looked good but since then im not hitting the 7k
Wow guys I was gonna say 6850-6950. 7K or better is REAL good for stock.
Dr Honda
Well-Known Member
If you get something in the pump... you will get crazy vibrations. SO... Unless it's stuck in the nozzle, that's not normally where the issue is at.
Since you are next door in OH.........
Was it hot and humid? (above 90F ??) If it was... the air density is lower... and that ill cause the RPM's not to peak. But, you are talking about a large drop-off. I would defiantly be looking at compression.
****EDIT****
Do you have the sound baffle in the hull? It's the big plastic tube that is normally in behind the engine, and under the seat. Without it... the air flow in the hull isn't right, and you may not be getting fresh air into the carbs. I know a lot of guys will pull it... but it really does it's job.
It's in the attention to details. That's why my Islandia will get up to 6200 RPM, and 49 mph, when spec is only 43 mph. AND... my old Sportster would get into the 43 mph range. (that had a single 720 in it)
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clmboating
Member
I've been getting 6,900 - 7,200 (limiter kicks in as well), and that's on a 96' GTX.
Prime Target
New Member
Heat and humidity can be a factor. Over 90 degrees and humid, expect to lose 200 rpm.
soccerdad
Well-Known Member
Will running a little rich also kill a couple hundred RPMs? Since I lost a motor, I opened the HS a little. I also am sitting at around 6700 on my skis. All at 150 PSI. The only time mine ever hits the rev limiter is if it is out of the water or when trying to get some fat butts on plane in a tube.
glsmohio
Well-Known Member
Well I did a compression test tonight and had 154 psi and each hole. I do run the big black thing under the seat so it gets hair. It has been in the nineties the last week with lots of humidity. I'm going to check the throttle tomorrow since I ran out of daylight tonight.
skewba98z28
Active Member
Depending on what went through your pump your impeller could have been tweaked slightly which will either gain or remove rpm. Humidity plays a big roll in max RPM. Trust me! I've seen 250 rpm swings on my 4-tecs. Check your water regulator on the waterbox also. I just lost my third "used" replacement on my XP. I was only getting 6600 with it leaking and it was real doggy out of the hole. I finally broke down and got a new one. ($140!!!) Put the ski in the water and remove the ski. If your regulator is bad you will see water coming out of the weep hole on the bottom.
Soccerdad: Richening your HS needles will cause a lose in RPM. Its not a bad thing, but if you want max performance turn them in! A slightly rich two stroke is a happy two stroke.
Soccerdad: Richening your HS needles will cause a lose in RPM. Its not a bad thing, but if you want max performance turn them in! A slightly rich two stroke is a happy two stroke.
glsmohio
Well-Known Member
Thanks man, I will check the regulater tonight. and your talking about water coming out of the weep hole on the bottom of the regulator?
Yes, there is a small hole in the bottom of the lower plastic housing just above where the hoses connect. Typically there will be hard water spots around it on the waterbox.
glsmohio
Well-Known Member
thanks for the info, will i need to start it and let it run in the water for a bit and then turn it off and look right away, or do it just need to float in the water lol (i know dumb question but just want to make sure), do i need to remove the ski out of the water? also do you turn the camp all the way in on them or what so you do ?
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You will need to have it running to see the leak. I would just pull the valve and the cover and see what shape the diaphragm is in.
glsmohio
Well-Known Member
glsmohio
Well-Known Member
well at lunch i went down to the lake and looked at the ski on the lift and look what my pics found. i would say this is my problem! i will water test it tonight
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