RPM 4-2-1 System
Posted: Fri Dec 10, 2010 9:30 am
Been sitting in my cupboard for months , with it being a sunny day and the plastics off the bike currently I decided to get it hunted out and fittd 
Was a bit tricky working out what headers went where as no marking on them but I got there, with the system fully assembled I slipped it under the lower cowl mounting and attached the can strap loosley then lifted the headers up and slotted them into place. A wee wrestle later and the nuts were on the studs and I was tightening the whole lot up.
Bike fired up no problems so off I went for a test ride. Instantly from the off a arked difference from the other systems I have used. Once bike was warmed up I started to give it some handfuls , low end and midrange grunt has totally changed and I short shifting blasting through traffic
Once out onto more open roads I let it rev right up , from low down upto about 8K it pulls strong then kinda tapers off a bit - not a dip but just stops that gut wrench feel but hey ho when it hits 11k it's off like a scolded cat again
OK, the FCR settings need fettled I can notice areas where a needle change/setting is needed and the mains feel to big.
From a 1st gear wind up it will rev all the way through to the redline through the gears. But roll ons at different rev's and gears shows it spluters a bit around the 5K mark and by the time it gets to 12k it's struggling. Wide open throttle in most gears was OK with top struggling. I'm sure most of this would iron out getting the carbs set-up for the pipe.
Coming back home again and entering city traffic was an utter hoot , I do love that low down grunt the 4-2-1 set-up gives
It is for sale as I can't be having four exhaust systems for the bike - well I can But really when the next bike is built I only want to have the two.
Next will be the DIC when I find it again and I want to try the BEET again with the new FIII settings in the FCRs. Then I'll start all over again when I fit the Bito FCRs
MM!
Was a bit tricky working out what headers went where as no marking on them but I got there, with the system fully assembled I slipped it under the lower cowl mounting and attached the can strap loosley then lifted the headers up and slotted them into place. A wee wrestle later and the nuts were on the studs and I was tightening the whole lot up.
Bike fired up no problems so off I went for a test ride. Instantly from the off a arked difference from the other systems I have used. Once bike was warmed up I started to give it some handfuls , low end and midrange grunt has totally changed and I short shifting blasting through traffic
Once out onto more open roads I let it rev right up , from low down upto about 8K it pulls strong then kinda tapers off a bit - not a dip but just stops that gut wrench feel but hey ho when it hits 11k it's off like a scolded cat again
OK, the FCR settings need fettled I can notice areas where a needle change/setting is needed and the mains feel to big.
From a 1st gear wind up it will rev all the way through to the redline through the gears. But roll ons at different rev's and gears shows it spluters a bit around the 5K mark and by the time it gets to 12k it's struggling. Wide open throttle in most gears was OK with top struggling. I'm sure most of this would iron out getting the carbs set-up for the pipe.
Coming back home again and entering city traffic was an utter hoot , I do love that low down grunt the 4-2-1 set-up gives
It is for sale as I can't be having four exhaust systems for the bike - well I can But really when the next bike is built I only want to have the two.Next will be the DIC when I find it again and I want to try the BEET again with the new FIII settings in the FCRs. Then I'll start all over again when I fit the Bito FCRs
MM!
