Posted: Sun Apr 09, 2017 10:49 am
First off Id like to Tim And TJ for all the help with this project. There was a boat load of work to be done in a few short days. Tim was swamped with other projects as usual but he found time and space to get it done. I will post this up in chonological order as things occurred as it will be easier for me .
The first beast on the list was a customers z400 which had a boatload of money love and time into . A very nice woods racer indeed. I believe he said he had over $15000 into the machine The engine was a 472 cc with just about every power mod that could be done. I forgot to ask for permission to post names or pics so I will just say the results. He ended up with a healthy 46hp which I think is crazy good for a z400.
Next on the list was Karens moto . The engine was the one owns the record for most powerfull stock part motor from many years ago. Since it was built with all worn out used parts and a welded up cable case I decided to test one of my own pistons in it. No big deal if it blew chunks. I set cam timing way back to 104 105 and had a custom right side full titanium exhaust with a early 2000 model suzuki right side muffler on it. It looks great and sound good while being super quiet. Unfortunatly the dyno showed that was a horrible combo as it could only muster 46 horse . We were scratching our heads trying to figure out what the deal was. I switch fuels with no change. I thought maybe when I threw the piston kit in I messed up the cam timing or maybe the piston was just that bad ? So in a last ditch effort to weed out the causes we threw a FMF ti system on and bam it went to 53 horse and some awesome torque. Dyno tuning was stopped as this will never run with that exhaust so it would be a waste of time to see what we could get out of it now that we knew the the problem was an exhaust. I am just glad it wasnt a piston problem. The valves were starting to leak when I pressure tested the engine so I will go threw it ,update the porting ,cam timing and see what the new pistons are capable of .
The first beast on the list was a customers z400 which had a boatload of money love and time into . A very nice woods racer indeed. I believe he said he had over $15000 into the machine The engine was a 472 cc with just about every power mod that could be done. I forgot to ask for permission to post names or pics so I will just say the results. He ended up with a healthy 46hp which I think is crazy good for a z400.
Next on the list was Karens moto . The engine was the one owns the record for most powerfull stock part motor from many years ago. Since it was built with all worn out used parts and a welded up cable case I decided to test one of my own pistons in it. No big deal if it blew chunks. I set cam timing way back to 104 105 and had a custom right side full titanium exhaust with a early 2000 model suzuki right side muffler on it. It looks great and sound good while being super quiet. Unfortunatly the dyno showed that was a horrible combo as it could only muster 46 horse . We were scratching our heads trying to figure out what the deal was. I switch fuels with no change. I thought maybe when I threw the piston kit in I messed up the cam timing or maybe the piston was just that bad ? So in a last ditch effort to weed out the causes we threw a FMF ti system on and bam it went to 53 horse and some awesome torque. Dyno tuning was stopped as this will never run with that exhaust so it would be a waste of time to see what we could get out of it now that we knew the the problem was an exhaust. I am just glad it wasnt a piston problem. The valves were starting to leak when I pressure tested the engine so I will go threw it ,update the porting ,cam timing and see what the new pistons are capable of .