Jcarney Posted January 27, 2015 Report Share Posted January 27, 2015 hey guys, I do some MX'ing and also a few hare scrambles a year with an occasional grass drag.when I trail ride, I ride like im in a race at all times. I'm trying to decide to upgrade my pipes or not. I'm currently running pro circuits and I absolutely love them but my fear is that they may be limiting my 421 serval a bit. they hit nice and hard down low and have solid pull all the way through. I rode my buddies ported stock cylinder 4 mil with CPI pipes and they were absolutely gutless down low- I had to keep the r's up pretty high just to ride, while the power band may have hit harder (im not really sure I wasn't hooking well) the pro circuits seem to pull for A longer period of time because they hit so much earlier. what does everyone think? Quote Link to comment Share on other sites More sharing options...
gusto Posted January 27, 2015 Report Share Posted January 27, 2015 SLP all the way and theres a wicked special on now in the for sale section. As for drag racing i agree with post above, youll just need to swap pipes. Quote Link to comment Share on other sites More sharing options...
Jcarney Posted January 27, 2015 Author Report Share Posted January 27, 2015 Just an occasional grass drag I'm not a drag racer- more hare scramble and mx racing Quote Link to comment Share on other sites More sharing options...
m671054 Posted January 28, 2015 Report Share Posted January 28, 2015 Wait and see if spark arrestors are coming out for the slp. Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted January 28, 2015 Report Share Posted January 28, 2015 Your comparing pipes on 2 different motors.. There are a few dyno comparisons on your setup In the dyno room. Have you checked them out? The cc difference and port layout would likely make the cpi feel entirely different than that of your friends stock cyl. Quote Link to comment Share on other sites More sharing options...
BANSHEEBEEFM2M Posted January 28, 2015 Report Share Posted January 28, 2015 Serval's are made for bottom end ain't they? Try your boys CPI's on your bike you might have to go with a bigger main jet.but what surfrjag is saying is real. Being that you have a serval, you will probably have more bottom end with cpi's then your buddy's stock cylinder motor with cpis Quote Link to comment Share on other sites More sharing options...
LaegerEliminator Posted January 28, 2015 Report Share Posted January 28, 2015 Talk to your motor builder. Most pipe tests on a Serval show that drag type or top end oriented pipes tend to work best on them. Quote Link to comment Share on other sites More sharing options...
BANSHEEBEEFM2M Posted January 28, 2015 Report Share Posted January 28, 2015 Talk to your motor builder. Most pipe tests on a Serval show that drag type or top end oriented pipes tend to work best on them. This. Quote Link to comment Share on other sites More sharing options...
Jcarney Posted January 28, 2015 Author Report Share Posted January 28, 2015 I am the motor builder lol. I did order my parts from Nate with KaN - very respectable and knowledgable guy. And Ya I've been looking at dyno sheets as well- I put my motor low 70's with my setup looks like cpi's can hit 80hp Quote Link to comment Share on other sites More sharing options...
LaegerEliminator Posted January 28, 2015 Report Share Posted January 28, 2015 I am the motor builder lol. I did order my parts from Nate with KaN - very respectable and knowledgable guy. And Ya I've been looking at dyno sheets as well- I put my motor low 70's with my setup looks like cpi's can hit 80hpSo are running as cast then, no porting? Sent from my DROID RAZR using Tapatalk Quote Link to comment Share on other sites More sharing options...
Jcarney Posted January 28, 2015 Author Report Share Posted January 28, 2015 Yea currently no porting Quote Link to comment Share on other sites More sharing options...
rjayb Posted February 26, 2015 Report Share Posted February 26, 2015 Ported servals on "drag" pipes is currently the best all around setup. I've ridden my 421 with Shearers on the track and handling is it's only down fall. Motor is amazing if geared right. As cast servals are kind of dog turds. If your not going to port, you might as well save the cash and have Redline port your stock jugs like he did for JD and run the SLP's. Quote Link to comment Share on other sites More sharing options...
sprinklerman Posted February 26, 2015 Report Share Posted February 26, 2015 Yea currently no portingUnported 4mm Serval won't hit 80hp. 1 Quote Link to comment Share on other sites More sharing options...
rjdgriff Posted February 27, 2015 Report Share Posted February 27, 2015 Ported serval FTW! Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted February 27, 2015 Report Share Posted February 27, 2015 Unported 4mm Serval won't hit 80hp.Wait...... they wont? But that was all the rage when they were released????80/50 with T5s and no porting. Quote Link to comment Share on other sites More sharing options...
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