Re: 1997 johnson fast stike 150 want more power,how?
OK kids, lets play nice and keep the subject on the same thread;<br /><br />yankee lipper <br />First Mate <br />Member # 31262 <br /><br /> posted August 20, 2003 09:27 PM <br />--------------------------------------------------------------------------------<br />I have a ranger 461 vs. i have a 24 pitch michigan wheel ballistic prop. i turn 5200rpm.i estimate my top end at about 60 to 62 mph.i do not have a jack plate but my boat has a built in set back. i did a comp. test on my clylinders. highest was 90 lowest was 70. most were 80 to 85. was thinking of shaving heads ? Can you put a 200 powerhead on my lower unit? what else can i do? <br />-------------------------------------------------------------------------<br /><br />OK. First we need to verify your speed. Do it by whatever method we will be using throughout the entire process --GPS, measured run etc. If you are truly running 60-62 now you are at 3 to 6% slip and I find that hard to believe with a Ballistic. <br /><br />Your compression raises some question on the cylinder thats at 70. Lets do a good decarb and recheck. We need to know the internals are all good before we establish our baseline. Do not shave the heads!!! <br /><br />At 5200 rpm there is no need to look for more power, we arent taking advantage of what we have now. The rev limiter is at either 6200 or 6700 depending on your ignition. Lets go with the 6200 scenario for now. Lugging the motor at 5200 may have a lot to do with your 70 lbs compression.<br /><br />I would also be looking at the probability of a different make/style prop. Think about what direction you would like go -- 3 blade, 4 blade etc. Any preferences? What are your thoughts as far as performance? Overall performance with a tournament load or light load and just top end speed? Or something in between?<br /><br />Post the numbers on the cylinder heads. Both should be the same.<br /><br />Think of this as a trip. We need a map. We determine our destination and we map out the best route to get there. We know where were going but now we need to know where we are in order to get there. <br /><br />Let us know!
