This is an archived version of the Road Star Clinic. The Road Star Clinic can now be found at www.roadstarclinic.com. Please join us there!

Road Star Forum
Welcome, Guest
Please Login or Register.    Lost Password?
170 main performance update
Go to bottom Post Reply Favoured: 0
TOPIC: 170 main performance update
#831267
jd750ace (User)
Front toward enemy
Platinum Boarder
Posts: 18763
graphgraph
User Offline Click here to see the profile of this user
Gender: Male jd750ace Location: Waxahachie Texas Birthdate: 1969-10-30
170 main performance update 3 Years, 4 Months ago  
So, after pulling my plugs a couple of weeks back and finding them slightly ashen, but not too bad, I decided to up my main from the 167.5 to the 170. I kept everything else the same. 37.5 pilot, 4th groove on the DJ needle, PMS screw, everything.
Done 250 miles on Saturday and played around with it some, but mostly running it in on a typical day ride and checking mileage. Mileage was right in line with the 167.5. Today after work I ran over to Midlothian to the ACE to pick up some hardware and took the long way back home to stretch it out to the limiter a few times and get a good solo butt dyno check in. The 170 pulls an appreciable amount harder up top than the 167.5, but I may drop the needle a half step for the 1/3 to 2/3 throttle roll-on. Thought it should be a little crisper in that range.

That's all for now.
 
Logged Logged  
 
  The administrator has disabled public write access.
#831268
Greysnake (User)
I'm so far behind I think I'm first.
Platinum Boarder
Posts: 15025
graphgraph
User Offline Click here to see the profile of this user
Gender: Male Location: Lawrenceburg,Kentucky. Birthdate: 1951-01-00
Re:170 main performance update 3 Years, 4 Months ago  
We now return you to regular programming
 
Logged Logged  
 
06 Midnight Silverado
*nothing shines like a star*
  The administrator has disabled public write access.
#831270
Curt (Moderator)
Never to old to ride!
Moderator
Posts: 22378
graph
User Offline Click here to see the profile of this user
Gender: Male curt.switzer@outlook.com Location: The Colony, Texas Birthdate: 1943-11-24
Re:170 main performance update 3 Years, 4 Months ago  
3rd slot two silver washers was what did it for me on my 05. Gram and Doc put me onto that in my very early carb years and it served me well even sense.
 
Logged Logged  
 
  The administrator has disabled public write access.
#831282
FireFighterZero (User)
Captain Zero!
Platinum Boarder
Posts: 1750
graphgraph
User Offline Click here to see the profile of this user
Gender: Male Location: On 'Da Farm Birthdate: 1983-02-16
Re:170 main performance update 3 Years, 4 Months ago  
Dang it!

I am gonna have to take my carb off this winter just to see now.
 
Logged Logged  
 
Is this not a reasonable place to park?
  The administrator has disabled public write access.
#831322
WITT33 (User)
Polish member
Junior Boarder
Posts: 181
graphgraph
User Offline Click here to see the profile of this user
Gender: Male Location: Poland
Re:170 main performance update 3 Years, 4 Months ago  
HSR45 pilot jet 17.5 needle 97 on 1st groove from the top (this is not my daily setup) main 175 - 120 mph with easy but no more even 1 mph (50F air temp)
pilot jet 22.5 with 175 main - 125 mph, now I have 180 & 22.5 pilot but no time to check v-max, too cold.
I see that lot of people chasing bigger main raising needle.
 
Logged Logged  
 
Last Edit: 2014/10/29 04:09 By WITT33.
 

Yamaha RS 1700 2006 - White piggy
  The administrator has disabled public write access.
#831326
jd750ace (User)
Front toward enemy
Platinum Boarder
Posts: 18763
graphgraph
User Offline Click here to see the profile of this user
Gender: Male jd750ace Location: Waxahachie Texas Birthdate: 1969-10-30
Re:170 main performance update 3 Years, 4 Months ago  
WITT33 wrote:
HSR45 pilot jet 17.5 needle 97 on 1st groove from the top (this is not my daily setup) main 175 - 120 mph with easy but no more even 1 mph (50F air temp)
pilot jet 22.5 with 175 main - 125 mph, now I have 180 & 22.5 pilot but no time to check v-max, too cold.
I see that lot of people chasing bigger main raising needle.


My carb is stock type.
 
Logged Logged  
 
  The administrator has disabled public write access.
#831331
davej (User)
Platinum Boarder
Posts: 18167
graphgraph
User Offline Click here to see the profile of this user
Gender: Male Location: Toledo Ohio Birthdate: 1957-00-00
Re:170 main performance update 3 Years, 4 Months ago  
JD, Did you pull a plug to see what it looked like compared to using the smaller main?
 
Logged Logged  
 
dave
  The administrator has disabled public write access.
#831342
jd750ace (User)
Front toward enemy
Platinum Boarder
Posts: 18763
graphgraph
User Offline Click here to see the profile of this user
Gender: Male jd750ace Location: Waxahachie Texas Birthdate: 1969-10-30
Re:170 main performance update 3 Years, 4 Months ago  
Not yet. It was enough of a change to slip my clutch this morning though. Oh well. I can do that when I change my front brake pads I guess. I'll pull a plug or two soon and have a look. Doesn't "feel" too rich, but I'll see what wonders the plug may reveal.
 
Logged Logged  
 
  The administrator has disabled public write access.
Go to top Post Reply
Powered by FireBoardget the latest posts directly to your desktop
...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... -->
New Forum Posts


The Road Star Clinic is a collaborative community of riders who archive and publish user contributed technical data about Yamaha Road Star motorcycles.

Copyright 2003-2007 Road Star Clinic and its respective authors.
<-- -->