Hi Jhonn,the K&B 100 I bought here on the net was $105 shipped and it did not want to run good and I know why people do not like the engine.I did some work on A Bob Parkinson F-15 reagle eagle with A K&B 82 Df and I reworked the piston and that engine was A great engine and I know now that's probably why Bob Violet used it as the KBV 82.I learned A lot from that engine and the difference from the 82 and the 100.The 82 ran good and had good compression and the 100 had low compression.Mine has the double bubble head and the way that they made the head was from the single bubble head and it lowered the compression down a whole lot.Does your's have the single or the double head button on it.If you have the single you are OK.I milled the double bubble button head down to bring up the compression and now I run it on no nitro but the engine would not run good before I did this now the engine running right but hot,358deg's and blowing the coupler on the second run and I got mad and cut the stinger off the pipe and the temp went down,256deg's and I could touch the engine after flying.I know now the compression makes A lot of difference on DF engine.To much on the Rossi 105 and not enough on the K&B100.I like these engines even though you have to do some work to them.When I cut off the stinger the KB 100 I still had plenty of richness on the inflite needle.
I will talk some more later,take care-Mac