verslagen1 wrote on 08/02/08 at 16:23:22:Check the hole in the jet, is it drilled out to a larger size?
No, if I compare the stock 145 with the 150,152.5 and 155 from Lancer's kit, the 145 has the smallest bore. Nobody has ever messed with the carb before. The white spacer is still untouched, yet the mid-range is very smooth and satisfying. I bought the bike from a girl, and she said other than the baffels cut out, nothing has been done to it before. When looking inside the gutted stock muffler, all you can see is a plate with four holes in it, just near the clamp to the header pipe. Two of the holes are about 5/16" in diameter, and two more about 1/2" to 5/8" in diameter, with one of them having a collar around it. I have no exhaust leaks, I tested that. Before opening the carb, I never had any troubles with backfiring on shutdown, but a few gunshot blasts decel every now and then. The bike pulls REALLY hard up to about almost 90, especially on a smooth concrete highway. You can even go behind cars with about 70-75, and the crack it open and go past them, and you're at about 90 in no time. It is actually impressive compared to other peoples Savage. But on a hot day like today, with temps hovering around 105F, it struggles to get to 90 from 85. It gets to 85 rather quick, but struggles to do more. I did a 40-70 top gear roll-on, and it did in about 9 seconds. When I change the 145 to put in the 150 jet, it struggles to get over 80, with occasional misfires at WOT. Letting off the throttle then and trying to maintain like 70-75 is hard to accomplish, because either it'll slow down just below full throttle, or give it a little more and it will accelerate again instead. There's no smoothe response at all. It acts like an on/off switch. The problem is even stronger with a 152.5 main. Also every time you roll back from full throttle a bit, it backfires briefly. It seems to me the plug is fouling up then. Although I haven't noticed any excessive soot or black smoke. The muffler is dark brown inside and just a tad black at the exit, and no soot on the rear brake lever at all. And like I said, the way it pulls with the bigger jets, feels like riding with two up. The bite is missing. If I put the stock 145 back in, everything goes back to normal, and none of those weird behaviours remain. I just find this out of the ordinary, considering my low elevation, and a 55 pilot/145 main jet combo to work good is rather strange. I already have read through 110 pages of threads to try to educate myself with peoples experiences and taking the experts advices, before my first post, but I havent seen anybody using this strange setup to make the bike run satisfactory. First of all it is strange to me, that it takes a 55 pilot jet to have a decent low throttle performance at 280ft elevation, furthermid-range is pretty flawless without white spacer mod at same elevation, and finally the stock 145 jet gives the best bang in the top end at same elevation. This is contradictory to anything else I've read here so far. Going by the book, my bike should perform like that with performance air filter at an elevation of at least 1000+ft up, and it still wouldn't explain the big 55 pilot jet. To me this is almost the opposite what everybody else does successfully to improve their bikes. I am pretty satisfied with this strange setup, however am very interested to improve my knowledge in that matter, and want to find an explanation why it is behaving that way. This carb tuning is like an art to me, and it's just fascinating.
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