Triumphrat

Binnsy · 10-01-2009, 05:01 PM

Any one running their carby Speedy on premium high octane? I have found that my bike runs better and harder on high octane 95-98 with a one step hotter plug. The difference is substantial and obvious when the service put back in stock plugs.

I have just recently bought some iridium plugs to see if that makes a difference but haven't tried them yet.

colinm · 10-01-2009, 05:46 PM

Can't speak for the high octane, but I have been using the iridium plugs for a while now. I think the bike runs better with iridium plugs (others may argue this) but they do definately help starting on cold mornings. For the little more they cost I think they are worth the money.

Colin.

braindead0 · 10-02-2009, 04:29 PM

Your ass dyno is not a precision machine, what exactly do you consider substantial?

Higher octane fuel does not improve the performance of an internal combustion engine. If the engine requires high octane due to high compression, running lower octane fuel can (if knock sensors are present) result in lower performance however.

In your carbed bike, using any octane rating higher than necessary to prevent knocking is a waste of money and will not improve your performance in any way.

Replacing dirty/worn our spark plugs with properly working items may be what helped.

Why'd you feel a need to go to a hotter plug? Getting poor/incomplete combustion?

Gob-ny-geay · 10-02-2009, 05:13 PM

Here's a good article on what "Octane" means, and why it won't make your bike go faster!

http://www.superchargeronline.com/content.asp?ID=105

Won't help at all with "power", but then again it shouldn't hurt anything either, therefore your choice wallet-wise.

boofhead · 10-03-2009, 07:41 AM

They should be run on 95 anyway , i use 98 sometimes as i get better mileage per tank from it , i would rather p!ss it in that run 91

Binnsy · 10-05-2009, 05:28 PM

Quote:

Originally Posted by braindead0

Your ass dyno is not a precision machine, what exactly do you consider substantial?

Higher octane fuel does not improve the performance of an internal combustion engine. If the engine requires high octane due to high compression, running lower octane fuel can (if knock sensors are present) result in lower performance however.

In your carbed bike, using any octane rating higher than necessary to prevent knocking is a waste of money and will not improve your performance in any way.

Replacing dirty/worn our spark plugs with properly working items may be what helped.

Why'd you feel a need to go to a hotter plug? Getting poor/incomplete combustion?

Possibly, maybe I should have been more specific; my bike runs like krap on standard fuel and stock plugs. Every time it is serviced and they replace the plugs with stock plugs it runs great, for a week or so. Then it gradually deteriorates to the stage where it becomes irritating to ride. Only fix so far has been to replace the plugs, which again only last a week or so then the same happens again.

Quote:

Originally Posted by Gob-ny-geay

Here's a good article on what "Octane" means, and why it won't make your bike go faster

Incorrect; if my bike runs like Krap on stock plugs and standard fuel and runs good on high octane and hot plugs then it WILL go faster, smoother, more responsive etc. I can tell you my Butt dyno is very accurate and the smileometer proves it!

Binnsy · 10-05-2009, 05:44 PM

Quote:

Originally Posted by boofhead

They should be run on 95 anyway , i use 98 sometimes as i get better mileage per tank from it , i would rather p!ss it in that run 91

Agree fully, I can't understand why the service teams I have been to always say it should run on standard unleaded? If I understand correctly 95 or high octane is what Triumph specify?

Maybe this is peculiar to Aussie fuels??

B02S4 · 10-05-2009, 07:36 PM

Binnsy, how is your bike currently set up (carb jetting, aircleaners, exhaust, & any other changes from stock)?

What plugs specifically are you using?

boofhead · 10-05-2009, 11:18 PM

Sometimes we can get a bit confused on these sites because the yanks have a different octane rating than ours , same octane differance but different numbers to describe it , if you know what i mean

doclees · 10-06-2009, 02:39 AM

I run the cheap regular. I just changed the original plugs at 16k miles. Perfect color. Perfect gap. Colder mornings seemed to need more fast idle. Tried the iridiums. Easier starts. No change in gas mileage of any significant but I will be doing a 10 hour ride up and back to Maine this weekend. Lets see if I can beat 60 miles per gallon. Doubt it. I always get better gas mileage on hot days.