Carb jetting for Arrow Pipe?

[jambo]

Phone a few places with a dyno, and explain that rather than a vague "how much to setup on a dyno" quote you would like the following:

1) A run on a dyno with an air/fuel mixture sensor to get a base setup after you've fitted the new parts yourself.
2) A short conversation about what changes should be made next if needed, looking at the data.
3) A 2nd run on the dyno once you've made those changes yourself, to confirm that the new setup works as expected, or make suggested refinements.

That should be significantly less than £500. If you're supplying and fitting the parts you're taking less of their time in the workshop, and on the dyno. Those are the expensive bits.

Ideally to make you feel better you'd have a "stock run" with it as is so you know that it's making more power at the end, but that's not all that important in terms of getting a finished setup.

Jambo

Originally Posted by jambo

Phone a few places with a dyno, and explain that rather than a vague "how much to setup on a dyno" quote you would like the following:

1) A run on a dyno with an air/fuel mixture sensor to get a base setup after you've fitted the new parts yourself.
2) A short conversation about what changes should be made next if needed, looking at the data.
3) A 2nd run on the dyno once you've made those changes yourself, to confirm that the new setup works as expected, or make suggested refinements.

That should be significantly less than £500. If you're supplying and fitting the parts you're taking less of their time in the workshop, and on the dyno. Those are the expensive bits.

Ideally to make you feel better you'd have a "stock run" with it as is so you know that it's making more power at the end, but that's not all that important in terms of getting a finished setup.

Jambo

Makes sense. Hourly labour rates add up if the carbs have to come out multiple times.

Ivan's kit sounds good, but I'm not 100% convinced of the plug and play nature of it. I may get lucky, but it's almost certainly going to need some fetling to get it spot on.

[jambo]

Originally Posted by Pricey12

Makes sense. Hourly labour rates add up if the carbs have to come out multiple times.

Ivan's kit sounds good, but I'm not 100% convinced of the plug and play nature of it. I may get lucky, but it's almost certainly going to need some fetling to get it spot on.

I'd agree, you're putting in a "best guess" combination based on other people's findings with other (similar but not identical) setups in other conditions.

I'd say you'll need at least 1 run to confirm what's working well and what isn't, and I'd expect at least 1 follow-up run to confirm you're heading in the right direction. It doesn't need to be perfect, you just need to show that the bike isn't running badly lean or rich anywhere. You can always do additional runs another time

Whatever you choose to do, get specific with the companies quoting for the work. You need their equipment & time and could use their knowledge about what to change if the setup isn't right out of the box. But you don't need them to do all the spanner work. You are then in charge of how many runs you do and over what sort of time period.

This should mean the quotes you get back make more sense to you and vary less

Jambo