satts Posted May 18, 2014 Report Share Posted May 18, 2014 Might b dumb question but what's the spring on the shift fork for? Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted May 18, 2014 Report Share Posted May 18, 2014 Duneable override. Quote Link to comment Share on other sites More sharing options...
camatv Posted May 19, 2014 Report Share Posted May 19, 2014 i did the case texture back in 2000... also didnt do it a lot and never really noticed a big difference.. on the oil thing i have noticed more with differnt brand oils leaving "puddles" in the cases after disasssembly and also a few oils leave nothing. yamapube seems to leave a dirty dry film at best. the better certified oils leave a complete oily film all over the internals of the motors. after a while they settle down in the bottom of the case. on the case match i have never seen one with that deep of a trench towards the back of the cylinder. i'm thinking thats too maybe pickup the spray off the crank and hose it into the transfer area. thats cool but i dont do mine like that because i dont try to spray the intake charge towards the crank lower section... it makes more sense to me to have it go right in the transfer... hmm also i dont like to do nothing with the case bearing oil supply holes i personally do a lot more with that area to help with lubrication.. i have seen some cases filled in in that area and just the single small hole for the lube to hit the bearing.. didnt like that much.. whats funny is that motor had bad crank bearings in it... hmm just my notes on this.. Quote Link to comment Share on other sites More sharing options...
registered user Posted May 19, 2014 Report Share Posted May 19, 2014 (edited) i have seen some cases filled in in that area and just the single small hole for the lube to hit the bearing.. didnt like that much.. well remember nearly every dirtbike engine from day one has used just a simple hole and they seem to do fine. increasing the hole size alittle might give positive results in the long term but i dont see any reason to reinvent the wheel here it makes more sense to me to have it go right in the transfer... hmm if the reeds open around BDC or slightly after like some people say then yes it makes sense to have a clear unobstructed pathway to the trasfers. without boyesen ports i dont think much mixture will reach the transfers via the reed cage on a banshee . that may be one advantage to a case reed design. nothing but a clear path to the trans opening Edited May 19, 2014 by registered user Quote Link to comment Share on other sites More sharing options...
camatv Posted May 20, 2014 Report Share Posted May 20, 2014 yeap and those crank bearings are not ball bearing style.. pretty sweet huh.. plus even better check out that factory case stuff.. neato is that a ktm motor? i have a 380 in the gerage that i am contemplating installing into a yfz chassis. but also have a 95 yz 250 i could use also. case reed motors have a certain powerband.. they really seem to be more higher strung motors.. what i think i did was similar to that but using a piston ? reed port motor configuration. and yes without the added ports it cannot happen on the oem banshee motor. i did it in a way that i havent seen before. and required welding up the sides of the cylinders. whats really interesting on the 350 i did is it deff has a noticeable power surge in the top of 3rd and 4th gear. its weird and i have never had a motor do anything like it. i think the motor is reacting to the increased load OR the flow just happens to all come together and the pipe optimizes at that point also. i will see what will happen when i drop 140 lbs off the bike into the drag chassis and put in an override, and crank up the timing. of course these are my opinions. i PERSONALLY build motors to last. so i look at lubrication aspects pretty closely. if you want to fill in that throgh, and leave a lil bitty hole in there for a high strung high rpm motor thats cool i just do it a lil different. Quote Link to comment Share on other sites More sharing options...
registered user Posted May 21, 2014 Report Share Posted May 21, 2014 i seen them 380 before. whats the balloon thing front of the cylinder ? Quote Link to comment Share on other sites More sharing options...
camatv Posted May 21, 2014 Report Share Posted May 21, 2014 balloon thing?? i'm guessing you mean the exhaust chamber? if you are they pv uses a chamber to trick the motor into thinking it has a differnt size pipe on it. some aftermarket you can get spacers for them to tune the power of the motor. Quote Link to comment Share on other sites More sharing options...
registered user Posted May 21, 2014 Report Share Posted May 21, 2014 oh the exh chamber. so it tricks the engine to think it has a longer pipe at low rpm and high rpm the pv blocks off the chamber ? Quote Link to comment Share on other sites More sharing options...
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