Quantcast
Jump to content

2-Stroke Jetting / Power Band

donved

By donved
in General ATV Discussion

 Share

Recommended Posts

donved Newbie

donved

Posted
Posted

I just put together a 87 TRX 250R with a completely new 320 stroker and my first run to the dunes has me scatching my head a bit. The jetting seems dialed in and over all it ran very good but the rpm range to get to the power band seems high, which made it hard to pull the hills in second gear. It would bog down unless I kept on the clutch and that usually meant that I had to go faster than I wanted to. Is it possible to change this with the jetting or do I have the wrong pipe or.... do I gear down? I'm running a Pro-Circuit Platnium pipe.

Any advise out there?

jigolbeep Collaborator

jigolbeep

Posted
Posted

I would try gearing down a tooth in the front... Thats what i had to do with my banshee so i could launch in second when we sand drag... there are a few factors that could be messing with your power band...

What paddles are you running, how tall andhow many paddles do they have? I went from 20 inch sand stars to 21 inch 8 pdl haulers...

Did you have any porting done along with your stroke? It can effect when your powerband kicks in to...

you might do some research on your pipe, they are built for different powerbands too... I have CPI's on my banshee and they are high rpm pipes but they scream when they get up there...

DirtDemon Veteran

DirtDemon

Posted
Posted

With the extra power that you should gain with a big-bore stroker, you shouldn't need to gear down unless you are running larger rear tires. Infact with that kind of power increase, you should be able to pull higher gearing. However, like jigobeep said, some times gearing down is optimal for ceartain situations like dragging and hill shooting. He also mentioned porting, did you have any porting done? Also, pipes made for a stock bore 250 weren't really designed for a big-bore. Curtis Sparks, FTZ, and ESR as well as others all make good pipes for that. I have always heard of people having great resulsts from the ESR TRX-5Centermount on thier big bores.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing

  • Similar Forum Topics

    • prdicon
      Which ATV hold better value as used
      By prdicon
      I was looking to buy a new ATV. 
      I was debating between Polaris sportsman 450 and Honda rancher.
      Polaris it a bit cheaper.
      But can you tell me which one will have more demand on the used market? Which one will keep it's value better?
       
      Let's say 3-5 years from now.
    • Adamb2025
      1990 fourtrax 300 no power no lights
      By Adamb2025
      I have a 1990 Honda fourtrax 300 2x4
      I rode the other day for 30-45 min. Switched it off and now it is completely dead..
      battery is fully charged, fuses are good . WILL NOT TURN OVER ,
      headlights won't turn on , No neutral, reverse or oil temp lights . Electrically it is completely dead !!! I replaced the key switch and CDI box , STILL NOTHING.
      I bypassed the neutral safety switch and grounded it to the battery and still nothing !! I used a jumper wire on the starter Solenoid , the motor will turn over but not start . I even bypassed both fuses and straight wired it to see if I could get a neutral light or headlights still nothing . What could it be ?
    • AnthonyT
      First time ATV buyer
      By AnthonyT
      In search of my first ATV? What are good older 4x4 models?
    • Frank Angerano
      My first trailer project.
      By Frank Angerano
      So I decided to pick up a small trailer if I could get one for the right price.  I found this one for a few hundred bucks on Craig’s list.  It is  a galvanized trailer which is exactly what I was looking for. The wood was shot and needed some minor repairs which I could care less about as long as the chassis was good. 
      I striped it down and put a new deck on. I had some vinyl realtree graphics that I had laying around so I added them to the fenders which I think worked out well. Very happy with this little guy.  
      I'm having the iron workers at my jobmake me up a few lightweight side rails that will have a 22 degree bend in them to accommodate the tires that slightly hang over the edge and will incorporate some tie down points as well. 








    • davefrombc
      Power Station
      By davefrombc
      Anyone  carrying  a power box when  camping with their ATV?  I built  a custom  one.  I  used a  marine  battery box that  has 2  50A Anderson Grey connector  outputs (  changed one of the greys to a red), an accessory socket  and2  USB outlets,and a battery  voltmeter ..  I  added a Pure sine wave 1,000w inverter to it and A red 120A Anderson connector to the  output  posts.. To  charge the  100Ah LiFePO4 battery  I  put in the box, I added  a DC to DC charge adapter that I  made input connectors for to allow charging the battery from a vehicle's  accessory socket  or a solar panel.   
      It  was a fun  project.. Besides  having a  1,000w power box for  120V ac , USB   and  12v accessories using the 10 A socket.  I  have  50  A  Anderson connectors  and the 120 A connector  to run  things like a  12v electric outboard   for fishing  trips .  The LiFePO4  battery  only allows a max output of 100A  so  it  can't be used for something like jump starting,  but  it  is half the weight and  delivers twice the capacity of a lead acid battery running accessories..  Commercial pow2er  boxes  don't  deliver  high draw 12v output to run things like  the  electric outboards.   That's one reason  I  custom  built  mine.   One box that serves for both camping and fishing.
       

COMMUNITY SECTIONS

ATV FORUMS

QUADCRAZY MEMBERSHIP

Be a part of best online community of ATV riders and join thousands of people who love ATVs! Share your ATV photos, videos, ATV rides, get help with your ATV and more. Not a member?

SIGN UP TODAY

ADVERTISE WITH US

FOLLOW US ON

  • Automotive Webmaster
×
×
  • Create New...