91 superjet bogging out

dsean · Jul 9, 2019

Hey so my 91 super jet with a 94, 61x 701 motor with stock carb. b pipe. And aftermarket head has no power going full throttle. It idles fine but has no top end power. Cleaned the carb twice. Looking for any insight on what the problem could be. Thanks

bernard · Jul 10, 2019

I'm going through the same thing. Check fuel filter, reeds, compression, and spark if it isn't the carbs.

dsean · Jul 10, 2019

Thanks. I was going to check compression next. Do you know what the compression should be in each cylinder?

bernard · Jul 10, 2019

150 or so. The numbers for each cylinder should be close to each other. It will run on fairly reduced compression ok but the numbers should be close at least.

dsean · Jul 10, 2019

Cool thanks

JFGJetski · Jul 11, 2019

Also whe cleaning the carbs have you checked the filter in them? My carbs looked fine till I pulled out that filter and it was junk

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dsean · Jul 11, 2019

I'll see if I can find where that is. I'm not super familiar with how these work. Are the reeds in the intake manifold? Also I checked the spark and compression and they were both good

JFGJetski · Jul 11, 2019

If you pull apart the carbs from the back side, not that dimond looking plate with the tab on the bottom you will see a blank protruding o-ring and if you use a needle nose you should be able to pull it out, if you are already doing this work I would recommend a full carb rebuild kit, I'd recomend getting it from jetmaniac hes reliable and has good prices, and yes the reeds are in the intake, they are attached to the intake manifold and sit inside the casing.

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pineapple · Jul 11, 2019

i had a problem with my 650 not to long ago where it would idle fine but when you grab some throttle it would bog down and not reach the rev limiter. I thought it was carb related or a fuel issue, turn out to be my ignition coil.

dsean · Jul 11, 2019

pineapple said:
i had a problem with my 650 not to long ago where it would idle fine but when you grab some throttle it would bog down and not reach the rev limiter. I thought it was carb related or a fuel issue, turn out to be my ignition coil.[/QUOTE

pineapple said:

i had a problem with my 650 not to long ago where it would idle fine but when you grab some throttle it would bog down and not reach the rev limiter. I thought it was carb related or a fuel issue, turn out to be my ignition coil.

Click to expand...

What did you do to diagnose that it was the ignition coil?

bernard · Jul 11, 2019

Sounds like mine could be the coil as well then. I have an extra, I will swap it over and see.

dsean · Jul 11, 2019

Let me know if it works for you. I will test mine also. Prob rebuild the carb while I have it apart also

SuperJet-Dave · Jul 14, 2019

Would try running without the fuel filter (the one in line, near the fuel tank). This is an easy thing to do before some of the more invasive possibilities. Good luck.

dsean · Jul 14, 2019

I'll try that thanks

pineapple · Jul 16, 2019

I just put a different one in and it worked great

bernard · Jul 16, 2019

I swapped mine with one I know works. It sounds good, I'll give it a test ride this evening.

bernard · Jul 16, 2019

Nope, was not the coil. It isn't a head o ring either. I did find a bit of water in my box, maybe my zeeltronic is damaged now.

dsean · Jul 17, 2019

Dang... is the zeeltronic in the same box as the coil?

bernard · Jul 17, 2019

dsean said:
Dang... is the zeeltronic in the same box as the coil?

Yah. I bought a new fuel filter and orings for the head. I'm pretty sure it isn't the fuel filter, it might be my orings, they might be leaking, hard to tell. I might get some better head studs. My pistons look good. I'll take apart the Zeel next if I have to.

dsean · Jul 17, 2019

Keep me posted. My new coil and carb rebuild kit just came in so I'm going to install it all and see what happeneds