Author Topic: I always use 87 octane  (Read 1649 times)

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Offline mirage

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Re: I always use 87 octane
« Reply #25 on: July 31, 2019, 10:19:22 pm »
I use premium in my 14 and the ZRX. Try to avoid ethanol but that is getting very difficult. When I had my KLR bored out it really pinged when I loaded it up at first and I use regular gas in it.  Oil samples all came back normal for the KLR (30K) and the ZRX (45K). My ECU is stock on the Connie and I'll stay with premium and prefer Top Tier fuel in it.
Dan
2004 ZRX
2006 KLR
2014 Concours

Offline Daytona_Mike

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Re: I always use 87 octane
« Reply #26 on: July 31, 2019, 10:24:05 pm »
Hi Dan,
I too had my KLR bored out to 688. I have to run High test in it as the compression went way up. IT wont run on regular.
 I thought both over sized piston sizes where high compression.   I had some other work done too.. decking and port/polishing and complete after market exhaust ( and rejet and oveflow tube installed)  The KLR's hydrolock too like the C10's.

« Last Edit: July 31, 2019, 10:27:06 pm by Daytona_Mike »
Normally aspirated engines have perpetual turbo lag
2000 Red C10 1052 kit 100+HP  + way more torque.
2008  C14 Silver Dammit Full AreaP- Flies are put back in SISF_Flash
2011  KLR650   688 piston ported and polished
2011  KTM 530    This thing is FUN!!

Offline mirage

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Re: I always use 87 octane
« Reply #27 on: August 01, 2019, 12:57:34 am »
Not to high jack the thread: That is interesting.  685 kit on mine, no head work (wish I had), jetted, stock exhaust.
Dan
2004 ZRX
2006 KLR
2014 Concours

Offline none

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Re: I always use 87 octane
« Reply #28 on: August 01, 2019, 06:03:24 pm »
I agree Steve.  For.50 a gallon why risk the possible damage.  I run premium in my 09 Miata.  My brother has the same car one year newer and he says no problems.  Again small price to pay for the confidence that although something might go a miss it won't be because I burned the wrong fuel.  Besides average 45 GPM on my Connie so...…..really a difference of $2 bucks when I fill!!!!!

Offline Dirtwiz

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Re: I always use 87 octane
« Reply #29 on: August 02, 2019, 09:14:33 pm »
I  also consider the gas the previous customer was running. If a guy ahead of you filled up with 85 octane you can get about 3/4 of a quart or so of 85 into your bike which dilutes your fuel a little. I asked a tech who was working on the pumps one day and he told me the hoses hold about that much when he replaces them. I don't think its a big deal but I run 91 anyway and always Top Tier.
In theory, practice and theory are the same. In practice, they aren't. Without data you are just another guy with an opinion.

Offline connie_rider

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Re: I always use 87 octane
« Reply #30 on: August 03, 2019, 01:23:08 pm »
I've always used Reg. in my C-10, and Premium in my C-14.  {Kawasaki specified it, and I thought it worth the extra cost}
I recently upgraded from the MR to the MRP Flash...  :great:

Now the extra cost for premium is "definitely" worth the price!  {Yahooooo!!}  :motonoises:

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Gone but not forgotten; 87 and 00 Connies..

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Offline cuda

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Re: I always use 87 octane
« Reply #31 on: August 03, 2019, 07:14:23 pm »
If I get Steves newer flash which increases the heat I wouldn't  go below 90 off-road since I'm putting my HP boat back together, I'll  be switching my home gas to 90 off-road, I have three 500 gal and 2 100 gal tanks, road diesel, off-road diesel and gas, most everything is diesel with the business equipment, the money thing is not the reason I don't use 90 whatever, it's I don't believe it's really needed  as stock, I also only carry 200lb me never a passager or tow, S Fl flat roads, the only hills and turns are getting on and off the interstate (joke)   now what Steve is doing with the timing and such is different.
To be honest, I don't always use 87 ;D maybe 30 to 40% of the time, depends on what's in the home tank,
 When I was racing our spec fuel was 112 Sunoco Supreme, so we bought 55gal drums of it, that's around $10.00  to 15.00  a gal. > how much you buy at a time.
I sent my used royal purple MC oil to Blackstone, I have to confess since the hurricane hit us two years ago I did not use the bike much so the oil is 2.5 years old with two-track days included, about 3,000 miles but 2.5 years that 87 was used a lot because I have not been boating. 
Things were getting too quiet around here need some controversy :33: 
« Last Edit: August 03, 2019, 07:18:44 pm by cuda »
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Offline TimR

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Re: I always use 87 octane
« Reply #32 on: August 04, 2019, 05:03:16 am »
Quote
Things were getting too quiet around here need some controversy


I kind of like quiet.  ;)  I personally use the highest octane I can get for the Connie and Regular in the 900. I also like alcohol free when I can get it. 
Blue 1975 Z1B 900, Red 09 C14     I might not be perfect but at least I don't ride a Suzuki

Offline N/a

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Re: I always use 87 octane
« Reply #33 on: August 04, 2019, 04:18:52 pm »
I don't use 90 whatever, it's I don't believe it's really needed  as stock,

I guess my question is then. Why did the people who built the bike tell us to use it?

Offline Grant

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Re: I always use 87 octane
« Reply #34 on: August 05, 2019, 01:17:57 am »
I don't use 90 whatever, it's I don't believe it's really needed  as stock,

I guess my question is then. Why did the people who built the bike tell us to use it?

Cylinder pressures, the C-14 has a relatively high compression ratio and brings as it is designed for low end grunt I would imagine cam lobe separation is relatively wide.
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Offline Daytona_Mike

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Re: I always use 87 octane
« Reply #35 on: August 05, 2019, 01:39:47 am »
Concours  static compression is 10.7 to 1 and the ZX14 is 12 to 1     
Not really high but high enough to warrant higher octane fuel
Most definitely 87 is not going to play well at those ratios
« Last Edit: August 05, 2019, 01:42:58 am by Daytona_Mike »
Normally aspirated engines have perpetual turbo lag
2000 Red C10 1052 kit 100+HP  + way more torque.
2008  C14 Silver Dammit Full AreaP- Flies are put back in SISF_Flash
2011  KLR650   688 piston ported and polished
2011  KTM 530    This thing is FUN!!

Offline Road Runner

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Re: I always use 87 octane
« Reply #36 on: August 05, 2019, 07:07:26 pm »
I don't use 90 whatever, it's I don't believe it's really needed  as stock,

I guess my question is then. Why did the people who built the bike tell us to use it?

Exactly  :iagree:
David L. Hamil
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Offline Grant

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Re: I always use 87 octane
« Reply #37 on: August 06, 2019, 12:01:11 am »
Concours  static compression is 10.7 to 1 and the ZX14 is 12 to 1     
Not really high but high enough to warrant higher octane fuel
Most definitely 87 is not going to play well at those ratios
Remember cam lobe separation also comes into play here. For low end torque I am sure our Conines have a wide separation probably around 114° where as the ZX is most likely around 108° . Point being is Concours has less overlap to bleed off cylinder pressure so even though it's static compression ratio is less than the ZX it may need high octane even more than the ZX. Just pointing out compression ratio isn't the only factor coming in to play here.
2016 C14 and a work in progress custom V-TWIN pro Street.

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