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TOPIC: Re:dynojetting
#1029208
davej (User)
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Gender: Male Location: Toledo Ohio Birthdate: 1957-00-00
Re:dynojetting 5 Days, 5 Hours ago  
Ian Pemberton wrote:
I have already changed the jets,172.5 main,and 40 pilot.It still has the slight stumble at low revs and I'm not snapping the throttle open.I think maybe blocking off the AIS may help.Is it right that a golf tee stuck in the pipe works?
I live in Wales and can't get the Barons kit over here.
Thanks


I would have to question whether or not the Accelerator pump was working correctly. It should start squirting fuel as soon as you start to twist the throttle and a good steady stream all the way thru to about 2/3rds throttle. Also what groove is the clip in on the needle? It should be the 4th groove.
 
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#1029209
jd750ace (User)
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Gender: Male jd750ace Location: Waxahachie Texas Birthdate: 1969-10-30
Re:dynojetting 5 Days, 5 Hours ago  
Agree with all above. A decent port job on the intake manifold helps low to mid range torque noticeably. I had a lower rpm flat spot with my Longshots and K&N RA-066V air filter. Porting the manifold virtually eliminated that flat spot.
My opinion, dyno tuning a Road Star with stock internals is a waste of money at this point. The info given above is accurate, and IF you take that jetting to a dealership running a dyno, they are going to tell you the bottom end is rich. The problem with a dyno is the device can not produce front wheel rolling resistance OR wind resistance, nor does the drum produce the same inertial moment resisting acceleration as your bike with rider on board. Also, the “method” of the roll-on to produce the relative torque curve (which is all that is truly measured. Horsepower is calculated from the REAL measurement of torque) is somewhat flawed, because nobody whacks the throttle open at 30mph in 4th gear and expects to fire off to the moon immediately. Unless you just want a number to brag (or not) about, save your dyno money. You don’t need to pay someone for data you were just given for free.
 
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#1029233
Ian Pemberton (User)
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Re:dynojetting 4 Days, 6 Hours ago  
The pump is working correctly.I left the needle as it was.I got the jets from a dealer in Mikuni jets here in the UK.
I haven't had time to take the bike out recently but when I do I will reset the PMS screw and the idle speed(which I suspect is too slow).
If I have to I will strip the carb down again and set the needle with the shims as you say.One last thing,is there a link with a diagrame of the carb listing the parts
Thank guys(I will now register at the new site)
 
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Last Edit: 2018/02/19 06:26 By Ian Pemberton.
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#1029234
Ian Pemberton (User)
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Re:dynojetting 4 Days, 5 Hours ago  
I've tried the new site but can't find where I register.The sign up link isn't there.Thanks
 
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Last Edit: 2018/02/19 06:43 By Ian Pemberton.
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#1029235
SKWEARpeg (User)
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Re:dynojetting 4 Days, 4 Hours ago  
When you get to the new site, look in the upper right hand corner for the login and sign up buttons. Click on the sign up and follow directions. Once registered, the new Forum will send you an email to the email addy you provide. When you follow the directions in the email, you’ll be able to post on the Forum.

We had a member named Scott from New York who was an oil smarty of sorts, but also swore by simply adding a second shim under the plastic spacer on his 1700’s, instead of messing with a multi groove. The place you bought your jets, might be able to supply the proper shims, although a proper sized washer should work the same.

Good luck Ian.
 
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#1029237
roadiemort (User)
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Re:dynojetting 4 Days, 3 Hours ago  
How do I register?

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#1029309
Ian Pemberton (User)
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Re:dynojetting 1 Day, 7 Hours ago  
Thanks
 
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