ccdhowell
11-06-2011, 07:33 PM
You may remember my thread a month or so ago where my daughter grenaded the engine in her Raptor 125. After a couple phone calls I decided that I wanted jwiedner (Jason) to do the machine work for my rebuild. I sent him my cylinder, a new TTR125 head and all the little pieces that go with the topend. I decided to split the cases and dig all the debris out myself. Jason ported the head, did the seats on the valves, put is some nice titanium valve springs(stock valves) and opened up the carb intake that bolts to the head. Further he bored the cylinder to fit one of his 12:1 pistons that he had Wiseco make for him. He installed a Hot cam in the head too. He lightened the flywheel almost a pound.
I got the engine back together last week and took it out with my daughter for a shake-down and jetting run yesterday and we are super impressed with the performance of this engine now. I run a Keihen PE28 carb and am very surprised at the amount of 50/50 mix gas that this thing is gobbling up. It is running clean and very strong with a 180 main jet! We have about 3 and a half hours on the engine now so it will probably get a little stronger, but at this point it will eat-up most of the Apexs I've seen.
The only real problem so far is that when you really get into it coming out of a corner there is a little bit of clutch slip. I had some Barrett springs for a TTR installed yesterday. I'm gonna put the stock Raptor springs back in the clutch and see if it corrects the problem.
I'm seeing more and more of these little Raptors at the races but few quad guys have a handle on making power with this engine, well I wanted to give major props to Jason, he's out front of most on this engine and knows his business. Not to mention he's the only one with a 12:1 piston available, talk to him if you are racing a Raptor 125.
I got the engine back together last week and took it out with my daughter for a shake-down and jetting run yesterday and we are super impressed with the performance of this engine now. I run a Keihen PE28 carb and am very surprised at the amount of 50/50 mix gas that this thing is gobbling up. It is running clean and very strong with a 180 main jet! We have about 3 and a half hours on the engine now so it will probably get a little stronger, but at this point it will eat-up most of the Apexs I've seen.
The only real problem so far is that when you really get into it coming out of a corner there is a little bit of clutch slip. I had some Barrett springs for a TTR installed yesterday. I'm gonna put the stock Raptor springs back in the clutch and see if it corrects the problem.
I'm seeing more and more of these little Raptors at the races but few quad guys have a handle on making power with this engine, well I wanted to give major props to Jason, he's out front of most on this engine and knows his business. Not to mention he's the only one with a 12:1 piston available, talk to him if you are racing a Raptor 125.