carb and math question

[Big Lou]

1...during my carb synch,,seems to change with brands of gas ,,,finally where i want it now ,,,,thing is on number one carb gas gets into the tubing ,and will melt the tube , .. my yamaha big book didnt come with a, chapter 9, troubleshooting guide ,, it does run good again ,, still intermittent miss, did the diode stuff ,, actually hauls butt,, it came with straight pipes ,, my ears rang for most of the night ,,when it back fires ,,whew ,,

 

2....math question: the speedo never worked ,, i now have a 150\90-16 on the back,, on the interstate yesterday,, i was keeping with traffic at 40 to 4200 rpm.. wind picked up and I got into turbulance behind a truck -drowned radio- with noise ...so i goosed it picked up extra cylinder and after i got around truck the tach, said 6500.. how fast was I going????? when I did tranny it is all stock 1989 royale 1300:detective::detective:

 

STILL LOVE ..MY PRECIOUS... SURE IS FUN TO RIDE WITH THE GIRLS ,,CAUGHT 2 YESTERDAY DOWN NEAR THE LAKE... BOTH ON HONDA,S

Edited June 16, 2013 by Big Lou
PERIODS AND COMAS

[Prairiehammer]

the tach, said 6500.. how fast was I going?

 

What gear were you in?

What is the loaded tire diameter?

 

Here is a site with a calculator. Try it out.

http://wahiduddin.net/calc/calc_speed_rpm.htm

[lsutley]

If you were in the same gear, as when you were doing 40 mph, you would have been doing approximately 62 mph at 6500 rpm.

[Big Lou]

I was in 5th gear

[Prairiehammer]

I was in 5th gear

 

I would estimate your speed at about 114.2 mph assuming a 25"± loaded diameter rear tire.

[Big Lou]

Unloaded just me,, dunlop 401 ,,150-80/16

 

wouldnt do that with a passenger ever

[jfoster]

If you have a smart phone, they have free speedometer apps.

[Big Lou]

Hadnt heard of that thanks

[djh3]

Yea thers an app for that. LOL Also GPS will tell you. But I'm guessing you didnt have one at the time.

[Big Lou]

Dont think i want to hold it going around someone either

 

could get a mount though

 

GOT A SMART PHONE ..SOMETIMES WISH IT WASNT SO SMART

[painterman67]

I was getting ready to say . At 40 mph on my 91 Im at about 4 grand on the tach. At 80 mph Im at somewhere between 5 and 5500 . So had to be over 100

[pmelah]

if you dont know how fast your going:whistling: at 6500 your going to fast :rotf::rotf::rotf:

[Big Lou]

ST. BOYS I MET DIDNT THINK I WAS GOING TOO FAST OR THEY WOULD OF TOLD ME

 

 

SSOOO NNNOOOWWW:cool10::cool10:

[pmelah]

ride safe Lou and get a gps on that thing :rotf::rotf:

[Flyinfool]

My 88 turns right around 4100 at 65 mph in 5th.

Assuming that you were going at a common interstate speed limit of 65. Most trucks do real close to the speed limit.

Then to go from 4100 to 6500 rpm is an increase of, 6500 ÷ 4100 = 1.58537, so 65 MPH X 1.58537 = 103.05 mph.

 

Or as Yammer Dan would say, "Time to start thinking about shifting out of 3rd"

[Prairiehammer]

Here is a calculator specifically for motorcycles.

http://woodsware.aciwebs.com/gears/

 

If you were running the stock tire (140/80-16): 6500 rpm in fifth gear equals 116.2 mph.

If you were running a 150/80-16 tire: 6500 rpm in fifth gear equals 119.1 mph.

If you were running a 150/90-16 tire: 6500 rpm in fifth gear equals 124.7 mph.

 

In the OP you said 150/90-16. In a subsequent post you said 150/80-16.

 

In any case, the tire diameter is less when the weight of the bike and rider is applied, thus my earlier comment about "loaded" tire diameter. However, unbelted bias ply tires do grow at high speed, so maybe the tire diameter is effectively the same as a static unloaded tire.

[dingy]

 

2....math question: the speedo never worked ,, i now have a 150\90-16 on the back,, on the interstate yesterday,, i was keeping with traffic at 40 to 4200 rpm.. wind picked up and I got into turbulance behind a truck -drowned radio- with noise ...so i goosed it picked up extra cylinder and after i got around truck the tach, said 6500.. how fast was I going????? when I did tranny it is all stock 1989 royale 1300

 

 

In 5th, 119.2 mph, assuming tire full diameter.

 

Excel spread sheet attached set to your parameters.

 

Gary

[Big Lou]

that is definetly fast enough for passing.. from the back of a truck to the front ..

 

I was pacing him till radio started to drown from noise of wind and road