Xr2 Carbs - Page 2

roofer · 18-09-2005, 08:52 PM

Try hutchy for velocity stacks he did have a set.

scottyboy · 18-09-2005, 09:38 PM

Cheers roofer ive pm'd him! Got his number at work thinkin about it? might give him a ring 2moz!

JamesM · 18-09-2005, 09:42 PM

don't forget 72's dude

scottyboy · 18-09-2005, 09:45 PM

Ooh yeah! That would be messy if i forgot them! So ya reckon i'll see another 200rpm from these then JBD?

JamesM · 18-09-2005, 09:50 PM

Are yours jetted one size bigger (one size = 0.002") on cylinders 2 and 5? Thats the carbs opposite 1 and 6 as they cross over in the manifold.

This is usually done on carbed V6 merc fishing motors as 2 and 5 run hotter than the rest. However I'm not sure if its done on the XR2. Take a look at all the jets before you order some more as you may end up buying 6 72's and find you allready have two and need two 74's aswell. Hope you see what I mean!!!

scottyboy · 18-09-2005, 09:54 PM

Yeah see wot ya mean! Mine are all the same size! .070" at the mo. was gonna order some .068" tomorrow but im gonna hold fire now if hutchy's got some stacks!

michaelcaine · 18-09-2005, 10:10 PM

where are you getting them from,i had a nightmare getting 96 mains for mine,had to get them from the states in the end,much cheaper as well.
jamie

JamesM · 18-09-2005, 10:24 PM

Good question? I got some from Hutchy but they were spares he had lying around in his work shop. Myself and Burty have also got some in the past from DB marine in Tauton but again it was a case of rumaging through his box of new old stock jets. And from what I remember they were about £6 each.

scottyboy · 18-09-2005, 10:26 PM

Greg at GB watersports! He can get anything ya want and He's cheap! 01733322108

michaelcaine · 18-09-2005, 10:29 PM

when i enquired at my local merc dealer he said they wernt showing any stock in the uk,would have to order from europe or the states would take about 3 weeks,i orderd them from the states and got them in 4 days. let me know if you have trouble getting them.

Burty · 18-09-2005, 10:40 PM

here's the part numbers if its any help

JamesM · 18-09-2005, 11:10 PM

Quote:

Originally posted by scottyboy
Ooh yeah! That would be messy if i forgot them! So ya reckon i'll see another 200rpm from these then JBD?

Mine was jetted up 2 sizes and had exhaust relief (offshore mid, not standard for that motor).

I fitted a plate and went up one more size (3 sizes in total) and I definatly noticed more RPM. I used to hit 6600 in the sea with it trimmed out and 6750 on one occasion up a river with the wind behind me. Now I can hit 6600 easy in the sea without trimmed level. Trim it out to where I normally run and I see 6800 to 6900. Trimed right out and I've seen 7200 but I never trimmed it out that much before. so I reckon I've gained a good 200rpm maybe a bit more.

The general consensus on scream and fly is to jet up 0.004 from where you were with the airbox on. This is due to the extra airflow afforded by the stacks/plate over the airbox. So more air and fuel must mean more power I guess. They also seem to think it gains a few hundred rpm and my experiance seems to vairify this.

I shouldn't think the stacks and jets will cost you that much so all I can say is try it and see. Jets will allways be usefull if you ever do other mods like increase compression and the stacks look cool wether they work or not!!! And just think if the jets and stacks do nothing for performance you havn't wasted any money on buying the wrong jets cus the smaller 68's and leaving the airbox on would have made even less of a difference!!!