You’d be okay. There are quite a few guys running that GX390 with a 5.5 gpm which is only 2500 psi before the hose. I think I would prefer to have the extra psi just in case tho. If you have to, just throw your wand on and run really fast so the water moves faster out of the end of your nozzle and creates more force.
I think I would stick with a 7 gpm and 3000 psi or whatever you’d get. That’s still a lot of gpm. You’ll notice a big difference going from a 5.5 to 7 even though it’s only 1.5 gpm more. I guess what you could do is get the 8 gpm. If you end up wanting more psi just upgrade engines. I bet the 630 and 690 have a lot of similarities. You might be able to swap carbs and turn youe 630 into a 690. There’s always the chance the cylinders are larger and a carb swap won’t work but I doubt they are. I’ll do some digging unless someone else knows what can be done to get to around 22 hp with the 630 without modding it like crazy.
That was my thought as well, looking over the parts list that is the only difference I could find. Frankly though I’d be super happy with an honest 8gpm/2500 at the nozzle.
The power difference is all in the fuel delivery, they have the same displacement, bore x stroke, cam and the important one the compression ratio, with all that being equal it’s just the a matter of putting more fuel into it to get the same numbers as the GX690 as is proven with different part numbers on carb and fuel consumption being 0.7L per hour different at 3600rpm and torque being identical due to having same displacement.
@dcbrock With a 630, I’d personally choose this. A 7/3000 Udor setup sounds pretty great with a smaller buffer tank, too. Southside does push General pumps pretty hard at the expense of talking down Udor though. A bit unnecessary and off-putting. I have a General pump as well and I like it, but stating General pumps are much better than an Udor was an overreach on their part. Ftr, this was not Bob I spoke to, someone else at their shop. But I still like them for all the other products they sell and great pricing. I just ended up going with another shop that’d install the Udor without questioning my decision to do so.
Look all over for a set screw. They’re all a little different. Do you have an impact? The added vibration helps. Could also put some heat to the pulley but I would only do that as a last resort and wouldn’t get crazy with it. You’ll probably need an oxy/acetylene though. Another option is removing that snapped bolt and using a different type of puller. Something similar to a power steering pulley puller. If you get one be sure to use grade 8 bolts.
16 plus years pulling sheaves off tapered bushings and I’ve never seen how they can be so hard to come off.
Did you soak with PB blaster and use the three bolts at the same time walking it off evenly? The only way I could see you snapping a bolt off is of you just used one and it binded the two parts together.
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