Jetting
1 - 20 of 28 Posts
Joined
·
249 Posts
mx is that with a k&n drop in? if so you may still be a little lean. from what i've read about the pred - you should keep increasing the main jet size 'til you experience full throttle stumble then back down one size. you've probably increased the air flow by aleast 4x's and only went up 2 jet sizes. actually in the manual for cool riding conditions they recomend a 155 main anyway - which leads me to believe the factory jet could be a hair on the lean side. it wouldn't hurt to try a bigger main.
Joined
·
249 Posts
COOL!!!!!!!!!!!
Joined
·
249 Posts
fvl - thats a matter of opinion, but most likely you would need to upsize the main jet -
Joined
·
249 Posts
fvl i use a hmf pipe - it doesn't have caps or disks. its pretty much straight thru - and it is loud!
www.hmfengineering.com
www.hmfengineering.com
Do you guys think the small power increase is worth it for the extra noise, work, and worrying about your jetting? I think mine runs good stock and cant decide wether id want to worry about all of that stuff. Rejetting may not take much work but for me it seems like you never quite get it running as smooth as stock. Stock also helps when avoiding the police.
Joined
·
249 Posts
tyler if you stay, with in reason, with your mods you can certainly get it running better then stock thru the whole range. as far as a pipe, i think theres nothing worse then riding and not hearing your own machine over the ones your riding with(does that make sense?) - just my input 
if you can gain around 5hsp thats like a 10-12% increase - thats not "small". you will feel that in the seat of your pants, trust me!
P.S. 'round here we say FTP
if you can gain around 5hsp thats like a 10-12% increase - thats not "small". you will feel that in the seat of your pants, trust me!
P.S. 'round here we say FTP
Joined
·
27 Posts
Ok i'm hearing all this stuff about re-jetting but were can I find a jet kit. I need one pretty bad for my pred but I don't know were to get them or how much they cost. Prices and sources would be best.
Thanks
Thanks
Hi Jeremy,
Go to your Local NAPA auto Parts store. They carry screws and bolts and will have harderned hex head cap screws in metric sizes that will fit your carb bowl and slide cover. I got mine there and the total cost for it all was about $6.00.
The sizes you need are 4mm x 10mm, #81661 (Carb Bowl); 5mm x 12mm, #81664 (Slide Cover); and I also got several 4mm x 25mm, #82057, standard pan head phillips screws, for the carb to intake boot. It's a time and headache saving resolution to your problem.
As often as you are likely to be messing with your carb to get it right, it was the best money I spent...CHEAP ASS JAPANESE SCREWS!
Dump your airbox altogether, get a $45.00 Dynojet kit, a $42.00 Slip-on K&N filter, and a $3.00 #50 pilot jet;;;;;AND SHIFT AT 8000rpm!!! It hauls butt this way...10 times better than it did with the best airbox set-up I found, and it is way easier to service.
When the Vortex CDI box is available in about 2 weeks, I will add that, and get 10 programable power curves, and an adjustable rev limiter for some extra over rev capability. I will then be in Predator Nirvana.
Good Luck..
JJ
Go to your Local NAPA auto Parts store. They carry screws and bolts and will have harderned hex head cap screws in metric sizes that will fit your carb bowl and slide cover. I got mine there and the total cost for it all was about $6.00.
The sizes you need are 4mm x 10mm, #81661 (Carb Bowl); 5mm x 12mm, #81664 (Slide Cover); and I also got several 4mm x 25mm, #82057, standard pan head phillips screws, for the carb to intake boot. It's a time and headache saving resolution to your problem.
As often as you are likely to be messing with your carb to get it right, it was the best money I spent...CHEAP ASS JAPANESE SCREWS!
Dump your airbox altogether, get a $45.00 Dynojet kit, a $42.00 Slip-on K&N filter, and a $3.00 #50 pilot jet;;;;;AND SHIFT AT 8000rpm!!! It hauls butt this way...10 times better than it did with the best airbox set-up I found, and it is way easier to service.
When the Vortex CDI box is available in about 2 weeks, I will add that, and get 10 programable power curves, and an adjustable rev limiter for some extra over rev capability. I will then be in Predator Nirvana.
Good Luck..
JJ
hey bro I screwed up ALL FOUR of the screws on my carb man so what I did was just get my dremel out and put on the little cut off wheel looking thing and just cut a straight line across the head of the screw and i used a flat head screw driver to take the screws out. In fact Im still using it that way and it seems to work fine for me without problems wahoo saved me a buck or two.
wahoo saved me a buck or two.I have a stock predator expect for a k&n filter in the stock air box. and I am looking for more power. I want to add a w-b pipe , a slip on k&n air filter and jet kit.any recomendation on where to find these parts. Is this a good idea and if so any clue on jetting. I live in Michigan and elevation is about 1000 feet above sea level
Joined
·
171 Posts
hey guys I got a coupl of quick questions. First I read Heapsters thread about putting in a 170 main jet and the response he got from the bike that's what I want to do but I don't want to get a pipe because of the added noise so would re-jetting be as effective without adding a pipe or do I really need to to get that kind of gains.My bike is stock and I've got to do something because all the guy's that I ride with have modded bikes and they are killing me stock.I do alright in the trails but when we get to a long stretch they leave me in the wind.I want the bike to look as if it were still stock so that's another reason why I don't want to add the pipe any help would greatly be appreciated.I live in Florida so elevation is real close to sea level if that comes into play with the jet sizes or anything
Joined
·
249 Posts
Derrick-i can tell you one thing, the faster you get air/fuel into the engine the faster you need to get rid of exhaust. you can get gains from doing either mods (intake or exhaust), but they truly work best when done together!
Joined
·
171 Posts
thanks cmc I'm really thinking hard about getting the slip on but I really don't want my bike to be to loud.Stock is good but I need more speed so I geuss that the only way to achieve my goal is to do both the jet and pipe,but not right now because I want to see if anyone comes up with a header and pipe combo that would fit the predator,but I'll keep messing around until I can get it to run with the banshe's that I ride with they are all modded and they pull away from me on long open stretches but in the tight stuff I can keep up with them and I take charge then so thanks for the advise cmc.
Joined
·
171 Posts
[No message]
1 - 20 of 28 Posts
