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Post by scooterpimp on Aug 6, 2018 18:14:55 GMT -5
If someone can make a straight pipe 4t setup that doesn't sound like a farting popcorn popper..please let me know..best performing / sounding exaust i could run is the 1 piece style setup. (I have a scrap metal bucket full of sad attempts...)
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Aug 6, 2018 22:06:30 GMT -5
I have built many many engines with stright pipes. Saturday nights you can see fire coming out the exaust. Between the guys at the shop I raced for, my engines, and thousands of customer builds, I have never seen a burnt valve IF THE BIKE WAS JETTED CORECTLY. However, I have rebuilt my fair share of heads that had burned valves. This is almost always some customer that got the idea to put a big tube open pipe and pod filters on his self. With out rejetting. And I would hear these guys say “ well it suddenly was backfiring a lot, and if I cranked the throttle real fast, it would bog.
Yeah, suddenly. Like the first startup after the pod filters and pipe!
But when I got done with them, they had the fastest their bike had ever been. And bill that could buy them a second bike (G)
I had a rule that if they wanted ME to rebuild the valves, I would only do it if they had a omplete preformance head job. The bike they got back had a port job, matching ports to manifold, cc’d chambers, and enough Dyno time to get everything perfect.
This my should a little stupid, but I never “worked for” the dealer. I raced for them, and they let me have my own little area for my drag bikes and keys to the store so I could work any hours. Mydoing “customer work” came in a funny way. A customer came in that wanted a race engine built. The techs were swamped, so one of them asked me if I would pull an engine down for him over night, so he could start building it in the morning. I told him if he woul pull the engine and put it on my bench, I would take care of it that night. The next morning he cam in and found the engine (still) fully assembled on his bench. He came over to me (looking a little pissed) and asked why the engine was sitting on his bench assembled. I told him I ran out of things to do, so I put it back together. Then I explained I had fitted the big bore pistons, done the head (multi angle valve job and port matching) installed the new cam, degrees it, cc’d the chambers. Took .012} off the head to get it flat, took .010” off the jugs to make it perfectly flat. He put the engine back in the customers bike and when he took a lunch break I did a couple Dyno runs to get the mixture right. The customer was overjoyed and pulled the owner aside a couple weeks later to tell him how great the engine “ Spanky” built.
After that I got a steady stream of engines sitting on my bench when I came in after hours.
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Post by GrumpyUnk on Aug 7, 2018 12:41:41 GMT -5
quote:"overjoyed and pulled the owner aside a couple weeks later to tell him how great the engine “ Spanky” built."
Ummh, so are you 'spanky'? Or did the other tech take credit...?
When I took apart the used ones I purchased, both had what appeard to be warped cylinder head surfaces. I do not know if that is because they were never machined flat at the factory, or they were overheated or they were not torqued properly after BBK install or ??? I don't have a mill, so used abrasive on a flat surface and moved the head around evenly(as best.) until the un-touched 'low' area got touched. They run pretty well so far. It seems the 44mm machine is more peppy than the 47mm, but that is seat of the pants. When you removed the .012 form the head. where did you find the low area to be? Next to the chain case, across from the spark plug? tom
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Aug 7, 2018 21:54:24 GMT -5
Yes, Spanky was the tech that asked me to pull the engine down, not my nick name. After this became a habit ( as in I was building 5 or 6 engines a week! I had a long talk with the owner of the shop. Because I was not an employee, and therefore not really covered by their insurance, it was decided that what ever tech pulled and reinstalled the engine would get credit for that build. Funny thing was we had customers getting in intense discussions over weather Spanky or Burt built the better engine! Pretty much, I built all the engines from then on. As it happened, they had a great machine shop, but no one to do The machining. So I did all the machine work anyway. I was the only one in the shop that could do a multi angle valve job, and no one else did port work. For me, it worked out great because I never had to do the grunge work of removing and installing engines, but I got to do the part I love in building the engines.
Funny thing was that I would race at one track on Saturday night, and another on Sunday. And guys would come in the shop on Tuesday night and give the guys the “score card”. “Both Ike’s in the final we’re with Spankey’s engines” or Burt’s engine tore up everyone Sunday. Worst part was we had a third tech, Bobby, that did great work, and installed a fair number of engines, but no one ever came in asking for Bobby do an engine!
I basicly had two bikes (same engine). One was 100% legal as NHRA “ modified” class, the other ran drag bike. The 3 local strips always put my modified bike in the drag bike class ( even thought it should be in the modified class). When we had our little Tuesday night club house at the dealer, I would always hear about how they were almost as fast as our drag bike!
one of the guys took his bike down to Indy for the Nationals, and was a bit unhappy to learn the Shop (mine) “drag bike” was really a legal modified class bike, and he had to race me!
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