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Apparently if your cylinder was decked any, the girdle bolts bottom out in the cases and can't clamp the cylinder down. It was enough to pass a pressure check but not enough to completely hold the cylinder down in the abuse of riding. I noticed after my ride today that the coupler cover had fuel...

I had 120 pilot jets in my GRS carbs (similar to blackjacks) and the engine ran ok and I could keep it running well with constant throttle input but if I got sloppy it would blubber even at 2 turns out on the low screws. So I went up to 122.5 jets in and it made a huge difference even at only...

Anyone else finding it very difficult to buy pwc oil these days? I've been using the Pennzoil full synthetic marine oil for the last 3-4 years and love it. It's been readily available at 2 of the 3 walmarts near me (not the one closest to me though). However, every place I can think of locally...

I currently have a set of stock reeds and cages and a set of 1st gen rad valves (maybe dual stage boyesen reeds but not sure). I don't know how old either of them are but they will be going into a big bore motor with high compression. Both sets appear fine. Just trying to figure out which ones...

First, I've never been able to seal water out of any flywheel cover. Doesn't matter if I silicone every gap around the flywheel cover and starter, it always gets in. I'm going to try another gasket and silicone it as well...then cross my fingers. So that leads me into my next problem. The...

Just got my cylinders back from the machine shop. It's a speedwerx big bore cylinder at 85.5mm with R&D dominator pistons. I have digital calipers and T gauges but getting consistent measurements down to the .01mm is really tough. I oiled up the cylinders and tried to slide the piston through...

Just got a flyer in the mail from a place called fibreglast that I've ordered stuff through before. They now have patterned carbon fiber for those that want that extra visual appeal. I've got no stock in the company at all but thought some guys might be interested in it...

I brought a massive amount of tools but I still needed a cordless drill on more times than I can think of right now. A buddy of mine needed one as well and I started asking a couple people around me and they all said they were looking for one as well without any luck. I thought about it many...

I know there have discussions on this in the past but I'm not having any luck finding them. I'm debating between a 140 mag and a 144 mag. 99% of my riding is done in flatwater and I've got a ported big bore engine with total loss. The snappy hole shot is what I'm really after.

I'm kind of curious if my problem is carb related or something else. I bought an engine a few months back and it ran well. It had instant clean hit on the bottom end even after idling for a while and the plugs looked perfect on the top end. However, if I'm going slow, there is a wierd transition...

Just got my speedwerx motor installed over the weekend. I'm happy with the power but I'm noticing that I'm leaving the water before the engine really gets on the power band. Right now I've got a 9/15 hooker with a 85 taper bored nozzle, stubby cone, and R&D scoop grate. Should I unload the...

I know both carbs have the annular discharge and that the GRS carbs are a bit older but other than these two things, what are the differences between the two carbs?

I've got a set of carbs off of a 760. They are the 3 hole version I believe so I know they aren't the best and I plan to upgrade but it's what I've got right now so I'm trying to make them work. I'm trying to get a starting point for jetting on my big bore motor with ported cases and having a...

I'm trying to remove a kawi style coupler on this engine so I can put my cold fusion coupler on there but OMG this thing is on there. I tried my usual wrench through the coupler and some brute force. When that didn't work I went to my next method of heating the coupler and a longer wrench. That...

The manual says OEM pistons have a wear of -.25mm on the piston and the cylinder bore has a limit of +.1mm. I'm trying to figure out if the same wear limits hold true for Wiseco pistons. I'm close to the limit on the bore and trying to decide if I can get by with a hone and new rings or if I'll...

I just got my used Speedwerx motor yesterday and started doing some checking. The engine is a 771. The engine has flat top pistons (kind of) and as best as I can measure, they have a 1.5° positive dome to them. Now the speedwerx head has 23cc domes in it and I measured a 24cc fill volume...

I'm in middle GA and haven't had much luck finding any places that sell race gas. I've checked a couple race fuel sites that sell it and their lists are horribly outdated. I tried calling a speed shop about race fuel and they weren't much help. Not sure how a performance shop for dragsters gets...

Just curious how the speedwerx pipes compare to the b pipes. Can anyone comment?

Where is the best place to buy OEM fuel line? Seems like everyone swears by it now after the short rave on the colored fuel lines ended abruptly when the lines turned hard as a rock.

Anyone know if Speedwerx domes are still available or if there is another dome that will fit their girdled heads? I'm looking at a head that has higher compression than I really want to run. I guess I could get them machined down but if new domes are available, I think that would probably be the...