ive used 95 and 98 here in the uk, not noticed any difference with both, i filled with 98 the first 2 times after buying it and back to 95.

fitted a plug cap i took off my old fzs 600 in the hope itll make it better but hoping a friend can lend me his caps to try, if its those then happy days and annoying as ive gotta set carbs up all over again to run properly.

 

So had carbs apart again, main jets where on the wrong way round, front was on rear..

had wrong needles in, i had no idea they had specific needles even though they looked the same!

and its still doing it.

ordered a cbr stick pack so thats on its way from the usa.

 

By chance are you using the OEM connections on the enricher (choke ) and if you are have you checked the plastic peices that thread into the carbs for cracks, damaged threads and proper seating?

I'm going out on a limb here but figured I should ask seeing I didn't see anyone ask this. Given I might of missed it in the previous comments.

 

been a while since posting but.

i had carbs apart and i did manage to break the choke off in one side, i replace with a spare set i had and its still doing it.

still waiting on cbr stick pack to turn up from america, got hold of some standard coils and going to chuck those on see what happens.

also got given another set of carbs to try out but coils first then carbs.

 

When you get them"the Carbs" right you will know it,Once set the carbs only require the odd sync!

When you are happy with the way it goes leave well enough alone.

Trust me , after 4 years I have had my trials and tribulations.

All is sweet now and I hope it stays that way.

These bikes are old and I have replaced every part of the intake system and even have different carbs from an earlier model on and this thing rocks. I have a DJ kit installed however I don't agree with drilling the slides. I am back to standards that I took out of my spare set of carbs (the originals) and have the DJ needles set at the 4th clip.

182 and 185 jets fitted and the throttle is crisp at all revs. I have H Power stacks fitted with a standard filter so mixtures are irrelevant for you.

There are so many variables with these bikes and that is what makes them special.

Carbs are a dying art, anyone can download a program for a commander, but getting things right with a set of carbs by yourself is very rewarding.

That is the beauty of the VTR!

Good luck, hope you get it right!

 

Based on what you said, I know you've never tuned a EFI vehicle before. And if you did, you didn't do it correctly. It's not just a simple program that you plug and play, clicking buttons. Doing it the right way takes hours upon hours to reach perfection, just like carbs. The upside is that it doesn't require taking the carbs off each time.
Tuning is an art, no matter what form it comes in: EFI or carbs.

 

The word "Tuning" is used very loosely these days. Downloading a map from the net isn't tunig to tuners, but it is to most folks who buy a power commander. Everyone thinks their bike is highly tuned with someone else's map.

Anyone who has spent hours on a dyno changing fuel and timing maps, adjusting afr to find how the engine makes the most power, testing at 100% throttle, then 50%, then 25%, then blending the rest... Then maybe adding more fuel at 0% throttle opening at high revs to make the engine braking go away so the bike feels like a two stroke.... Lol... Yah been there...

In my opinion carbs are easy comparitively, though i do love playing in excel-like tables...

I do enjoy not needing a laptop and updating software... Just me and my wrenches.

James

 

I once went or a ride with some "mad Moto Guzzi " folks and every time we stopped one guy had his lap top plugged into his bike and was fiddling.

Each time he did it he pulled the plugs, made some adjustments while he waited and then informed us he was ready to ride.

Each stop, same again!

To my mind that is not enjoying the ride.

The carbs are a challenge, and a pain at the same time, but get them right and the satisfaction is immense, especially as you know that you have done it by yourself!

 

I had a similar experience with an older EFI dirtbike that I was tuning with my laptop. I was trying to dial in less engine braking so every time I got home from work I would add more fuel at higher revs and at 0% throttle opening.... After about 5 days of experimentation I got it right and it felt awesome. I never touched it after that.


I suppose it's like anything else: it's fun if you know what you're doing, but a nightmare if you don't.


James

 

Of course it's not enjoying the ride, it's tuning. Just like messing with carbs isn't enjoying the ride. It's meticulous analysis to see what needs to be changed. Street tuning to get the optimal throttle response while simultaneously achieving the best power is tedious and requires tons of time. But once it's done, like carbs, you can enjoy your bike to the fullest. And it's a gratifying experience knowing that you put in that time and effort, both for carbs and EFI. Then you enjoy the ride! Or, more realistically, you get OCD about it and keep fiddling with things.

That being said, buying an AFR wideband sensor and welding a bung on will make your life significantly easier than pulling plugs, or relying on a butt dyno, for both a carb and fuel injected bike. It's about $160, plus wiring it to plug in, but it's worth it. You can choose between making it permanent, allowing you to always be able to monitor AFR, or just have the wire hanging down to do just tuning. And even if you sell the bike, you can just cap the bung and remove the setup in order to use on your next bike to fiddle with.