Ron Hamp

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About Ron Hamp

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    TT Engine Expert

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  1. ! of my customers had purchased a honda moto 3 bike i think @ the time it was 1 of only 2 imported in to the us i had the cylider head here the new 2018 mx head is actually better in specification . the customer had tryed several options to get the bike past 49 hp and that was about it @ the time 1 of my carbed crf 250 engines made 44 on the same dyno. the moto 3 engines have the advantage of a sump and a solid crank shaft that reduces bending and friction = more hp .realisticly if i seen 49 hp from a 250 on my dyno i would be excited as 47 is the best i have seen so far in any thing that would be usable for mx .The new honda has larger intake valves than the KTM and a straighter port which will benifit high rpm only the honda engines i have produced make there peak between 12000 and 12500 flat lining to past 14000 rpm.most every one that rode 1 of my 250s said they felt more like a 450 and with the limiter seat @ 14000 rpm they said that the bike did not seem to rev as high as other bikes with the same rev limiter and it would need to be set @ 14500 to get that feeling . im hoping with the new engine we can mimic my old power and keep it going up to he new limiter .
  2. The direct acting folowers alow cams with much more velocity and there is less mass to control .the new lift on the cams puts them in the real race cam category the valve sizes are even larger than the ktm and the ports are much straighter than the ktm the bore stroke ratio are comparable to the moto 3 engines the new piston desighn with suport struts boxing and so on is state of te art. It will be dificult for the aftermarket to produce a better piston maybe this is why wiseco has started pushing the billet pistons as the forging dies to produce struted pistons are prone to breaking.
  3. Well i can help on the build i had done the top end on one that the late Tryce welch built i think it was for Lewis i know it beat the aprilia 125 2 stroke in florida
  4. Wish you could use the EFI engine i have one hear that is built up to the botom new crank super finshed trans with 3rd 4th gears under cut falicon rod have nt bought a piston yet but have a fully ported 2016 head with bronze alloy intake seats 25 mm buckets my rhc .5 mm orver intake valves .
  5. you can get a remap but as i recall the 2015 was pretty good even with the pipe change there wasnt much to gain if any
  6. Question!..i have a 95 kx125 with a 144cc big bore kit. Would a kx250 expansion pipe work on the bike

  7. i have a 08 kx250f and want to swap to a 09 kx250f frame will it work?

  8. Hey Ron..will a 06 crf 450r counter shaft work in a 05? Even though the part # is different.

  9. hey ron, just bought a 83 honda xr350r and im having trouble with the clutch, if i run the bike at a steady pace without changing gears for a while my clutch wont disengage when i try to downshift what do you figure is causing this and what is the best fix?

  10. Hey R on. Im new to the site have a question for you. I have a 2000 yzf426. Im doing a complete top end rebuild. Started installing my cylinder and notice the piston had alot of rock in the cylinder.  Didnt know if that was normal for those short skirt pistons?

  11. hiya have just bought an 1979 honda xl 500s with no cylinder head and as you no thay are very hard to find but have come across loads of xr 500 heads will it fit my xl 500 thanks

  12. no
  13. to much timing in the low rpm and low throttle openings if you have the tuner try taking a couple of degrees out @ a time untill your happy
  14. I started building a 2016 yz 250 for ax i ended up getting the 2017 head and took a good look @ the 2017 cams there going to be hard to make an improvement on for a ax bike the intake cam is pretty agressive as it maintained nearly the same duration @ .200" lift as most of the race cams available that have the same duration @ .050".the chart shows my flo compared to a ktm 250f race edition head it has my +.5 mm intake valves with the special back shape there a full 1 mm smaller than the ktm and the intake port is 4 mm smaller in a comparable cross section 38 mm compared to 42 for the ktm i had increasesd the yamaha by 1 mm from stock the yamaha flos considearably better @ the lower lifts and only gives up about 8 cfm @ the top .I also had some more of my custom boxed J&E pistons made with the dlc pin .Austin Haugt is the rider hes a big boy hopfully we can get him some hole shot power .
  15. Have you tryed calling dyno jet and see if they will give you a code to alter your drum weight . i had to make some adjustments with my super flo bench and they gave me a code to get into the software