91 or 98?? Fuel injector cleaner

[DJ DOOWOP]

This may be a dumb question, but what do you use for a DOHC 4 stroke bike 91 or 98? I prefer 98 but does it make a difference like in cars?
Also would you recommend using Fuel injector cleaner for cars in a bike? or are there similar products for the Carby?
I suppose 98 is cleaner huh?

thanx

[ManDownUnder]

Depends on the engine itself (age/design)

Mine happily runs either but I prefer 91 - it's cheaper...
MDU

[Lou Girardin]

The Redline range of fuel products work well, call Kendall Racing Sunnybrae Rd.

[clint640]

Higher compression motors need 96+. Try both, really lug the bike at low revs & feel how much detonation (like stuttering) you get. If you can't feel a difference use 91. It's cheaper & as clean. The FXR is 10.7:1 so there might be an improvement with 96.

Carb/injector cleaner is unlikely to make a difference in such a simple carb. If it's dirty you need to take it apart & clean it but unless you're having air filter or dirty fuel problems you're unlikely to have any crap in yer carb on a road bike.

Cheers
Clint

[ManDownUnder]

I note the addition of the "injector cleaner" thing.

All I know is that I added a bottle (or the right proportion of a bottle) of engine cleaner to my fuel a while ago and the RF ran like a bag of arseholes for the whole damned tank.

...never to be repeated...

[vifferman]

I note the addition of the "injector cleaner" thing.

All I know is that I added a bottle (or the right proportion of a bottle) of engine cleaner to my fuel a while ago and the RF ran like a bag of arseholes for the whole damned tank.

...never to be repeated...

Yeah. My VFR750 was the same. It ran like absolute crap on anything except 91. The 800 runs best on 98, only because it pinks a bit when hot on 91, and seems to have less power, which is weird or wierd or wired because there's no knock sensor or anystink, so it doesn't adjust the ignition timing or change it either.

[Marmoot]

I use Cleaner every 4 months or so. Makes running much smoother.
For carbureted bikes, use Fuel Cleaner, not injector cleaner, although both works quite ok.

Btw, I run 91. Tried running 98 and one winter day it just started coughing and won't burn properly up to the point where it won't start until it's flooded and the battery died.
Too cold for exposed engine.

[ManDownUnder]

I use Cleaner every 4 months or so. Makes running much smoother.
For carbureted bikes, use Fuel Cleaner, not injector cleaner, although both works quite ok.

Btw, I run 91. Tried running 98 and one winter day it just started coughing and won't burn properly up to the point where it won't start until it's flooded and the battery died.
Too cold for exposed engine.

Yeah - it was fuel cleaner I user and the RF hated it. Unfortunately for me I thought it'd be ok so filled the tank and put the right amount in... only to discover I had to wait 250kms (give or take) till the tank was empty again... and the bike would run smoothly.

[vifferman]

Tried running 98 and one winter day it just started coughing and won't burn properly up to the point where it won't start until it's flooded and the battery died.
Too cold for exposed engine.

True.
I stopped using straight 98 during the winter, as the bike was a bit harder to start.

[wendigo]

Also would you recommend using Fuel injector cleaner for cars in a bike? or are there similar products for the Carby?....

Was getting hard start, occasional coughing & stuttering and all round lacklustre performance, so I got some 10 dollar injector cleaner from Repco. I don't have much confidence in these 'pour this in your tank & unleash an extra 50 horsepower' remidies, but I was quite pleasantley surprised when it actually seemed to work. Much easier to start, smoother running & sharper pickup too.

[Marmoot]

The cleaner is just that....it only cleans. I don't know how it precisely does that, but it does clean the micro nozzles on fuel injectors or the jets in carburetors. Past experiences dictate that cleaning action can only be attained if the bike is run at decent rpm (upper mid range to high range) for sustained period of time.
So, the best time to use it is right before a decent ride that will use up at least half a tank.

If you use it when short-commuting daily with low speed, it tends to add to the fuel-system clogging, making the problem worse.

Oh, and best used in summer, or in warm engine during winter (i.e., engine already warmed up) to avoid starting problem.

[Flyingpony]

If you use it when short-commuting daily with low speed, it tends to add to the fuel-system clogging, making the problem worse.

2nd that.
Did a carb powered car before a long trip but made the mistake of stopping for 30min 5km after filling the tank. Was nearly impossible to start and ran very rough for the next 100km...

For cleaning your bike and you're only commuting, tank at Caltex because they have fuel cleaner in their fuel. The stuff does work.