September 10, 2013 at 4:38 pm #9563
been looking at the new skusa pipe for my stock moto, wondering what kind of results its providing with the 99 style cylinder as opposed to the R4.September 10, 2013 at 5:23 pm #9565
Lets just say at last weekends ProKart race all I saw on the grid were R4’s….
94ySeptember 10, 2013 at 6:34 pm #9570
I’m pretty sure that the Musgraves were using the SKUSA pipe.
Not sure which cylinder they were using but I’d bet it was the 2001
Mike G.September 10, 2013 at 10:06 pm #9583
+1 SKUSA Pipe.September 11, 2013 at 8:37 am #9611
I thought the SKUSA pipe was required now days.September 11, 2013 at 1:28 pm #9651
^ not until next year. Can still run the R-4 until end of this season.September 11, 2013 at 1:41 pm #9657
Anybody know anything about breakage? My buddy and I purchased two SKUSA pipes when they first came out and both are already cracked in the bend?? Had an R-4 for two years with no problem, need a little help here. MARKSeptember 11, 2013 at 2:40 pm #9662
Troy V SmithParticipant
SKUSA pipe should be under warranty for 6mo. I believe. Each should be engraved with a serial number, which should also be on your purchase receipt – might look at your warranty options from the seller?
We may not be the fastest on the track...but we're having the most fun!
https://www.facebook.com/wearekartersSeptember 11, 2013 at 3:14 pm #9665
Contact the company you bought the pipe from They can tell where to ship the pipe to have it repaired. We had one break, shipped it in and they welded a steel plate over the crack.September 11, 2013 at 6:16 pm #9686September 12, 2013 at 3:10 am #9702
uuuuhhh, nice warranty work….NOT!September 12, 2013 at 3:16 am #9703September 12, 2013 at 3:28 am #9704
Chris — as a fabricator, would you consider that type of repair “acceptable” if it was your pipe? Just wondering….why wouldn’t they tig weld it instead? I had a similar problem with my 95 CR125 back in the day….a hole blew open in my pipe during a moto, the bike only had a few hours on it at that time…my dealer called Honda on Tuesday (closed on Mondays), they told the dealer to collect the pipe and send it back to them. Two weeks later I received the pipe back repaired…I was amazed at how they were able to weld it up without having to put a plate over it. To this day ive never seen a weld job that impressive.September 12, 2013 at 3:45 am #9705
I’ve worked in manufacturing plants for more years than I like to share, generally speaking, if it’s cracked and you weld , it will crack in the same spot or near it. Putting heat into it from welding, weakens the material, Jimmy didn’t elaborate, but I would have to guess they welded the crack shut, THEN put a patch of metal on top to strengthen the area… That IS how I would do it for a customer…..
CRSeptember 12, 2013 at 6:09 am #9712
I’m not a fabricator or welder (but I did stay at a Holiday Inn Express last night), but Ive heard that drilling either side of the crack and then building and filling the crack with a tig welder is the proper way to fix this problem…I’ve seen several fixed this way and have not failed for a second time. Maybe I’m hung up on the cosmetic appearance of a plate welded onto a pipe rather than an additional tig welded crack. …but hey, if it works, what the hell, right?September 12, 2013 at 7:11 am #9736
Andy, that’s called “stop drill”, the first time I saw that was an aviation application where a crack in the plexiglass is drilled to keep the crack from propagating. If it’s welded properly, it won’t propagate from that crack, ie, welded all the way through. What will happen, is that it will crack near that area because the metal has been weakened from the welding heat. You could also normalize the area after welding it, but that’s not a guaranty.
A repair for my own pipe I heat the area up with a torch to clean off the inside, let it cool down, run a back purge, set the heat a little hotter on the tig so the weld speed is faster, and zip it up quick….
Everybody has their way of doing things, a manufacturer, doesn’t want to see it come back again….
CRSeptember 12, 2013 at 8:15 am #9776
thanks for the lesson Chris, I understand all of that clearly and completely…and you’re right — the last thing a manufacturer wants is to have to fix a problem product more than once thats for sure.September 12, 2013 at 8:22 am #9778
If it has a warranty I would think a cracked pipe would be completely replaced at no charge. At least that’s what my wife expects when returning defective items to the mall. She gets new pipe when she needs it!September 12, 2013 at 9:03 am #9781
wasnt thrilled with the plate but its better than nothing. from what I heard at the track last weekend, all pipes are going to have plates welded on them from the factory. Don’t know for sure if that’s true, but that’s the story floating around the pits.
Btw, this new site hates my iPhone 🙁September 12, 2013 at 10:03 am #9789
Andy, you’re welcome, hope that helps…
Hegar, why is it every time somebody talks about a crack pipe, you chime in? 🙂
Jimmy, I would be happy if they fixed the quote button/buttons!!!
CRSeptember 12, 2013 at 11:41 am #9790
I believe the pipe is now being shipped with a reinforced plate at the bend. Also some new mounting points.September 12, 2013 at 2:37 pm #9802
Pipes and kart racers, what’s new.September 14, 2013 at 5:27 pm #9959
Josh ButtafocoParticipantSeptember 21, 2013 at 8:13 am #10424
Has the SK1 pipe proved to level, or even out, the ’99 vs ’01 cylinder discrepancy?
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