Re-jetting A Solex

[allye 530 3 Cars]

Hi,

 

I know you can get a bigger jet for my solex Z2 but not sure what size or where from!?

 

Also I adjusted my clutch yesturday as it was sloppy and slipping when giving it a flying start before. Now I have tightened it seems to be stiff and biting just as high?

 

I replaced the clutch 6 months ago.

 

Thanks a lot, Ali

[Toddy 7]

If its for the tu3s engine (xs) then it is replacing the secondary 130 jet for a 140 or simply drilling out with a 1.4mm drill bit, made a difference to mine as it had a ported head, unsure whether its beneficial on a std engine.

[allye 530 3 Cars]

Its for my rallye, an iron block engine, it actually a SPI engine. Standard engine though.

[trogboy 17]

Am I missing something? SPI = single point injection so you wouldn't actually have a carb.

 

I wonder if you are refering to the fact that the carb on the standard setup just has a single twin barrel carb (Solex Z2-S2)

[allye 530 3 Cars]

Sorry for not being clear! It is a SPI block (a very low milage one) that i replaced the knackered standard block with, I put the solex and inlet manidolf on the SPI engine!

[RossD 43]

Has it got the XS head and cam or the SPI stuff - They are different.

[allye 530 3 Cars]

the SPI head and cam, SPI engine and original Rallye engine had the same power so you would assume they are the same head and cam. I would of loved an XS head/cam/engine but as you guys know they are not many knocking about!

 

So does any one know where i can buy bigger jets?

 

Or is drilling it out with a 1.4mm drill bit ok?

 

Its a cheap mod and I rebuilt the carb so i know my way around it.

 

Thanks, Ali

[swordfish210 20]

I'd go for a 1.25mm drill bit, 1.4 would make it bog down a bit and chew fuel.

[allye 530 3 Cars]

So you would suggest drilling it then? Did you XT come with one or did it already have the bike carbs on it?

[swordfish210 20]

The XT was completly standard when i bought it, i've done it all myself . I think the standard jet is about 1.15mm so if you take it out to 1.40mm you will have nearly increased the fuel flow by 50%! Too much methinks. Try the 1.25mm, it should be a good comprmise.

[johnnyboy666 195 1 Cars]

the K&N for the solex carb used to come with a bigger jet. not sure if they still make them tho.

[swordfish210 20]

the K&N for the solex carb used to come with a bigger jet. not sure if they still make them tho.

 

The K&N jet is 1.22mm, hard to find a 1.22mm drill bit though.

[allye 530 3 Cars]

nice, will buy a 1.25mm bit and drill out the jet some time this week and see if it makes a difference!

[calvinhorse 870]

what would you drill the jet out to on a xs head vtr bottom end jobby? bigger still?

[M_R_205 5 1 Cars]

In regards to your clutch, by adjusting the cable all you are doing is adjusting the pedal height, if the clutch is slipping you need to fit a new one im afraid

 

Paul

[calvinhorse 870]

can anyone tell me where to find the main jet? do i need to split the carb in half?

[Jrod 7]

can anyone tell me where to find the main jet? do i need to split the carb in half?

 

 

Yes, remove the top half.

 

In the middle youll see 2 brass flat screw heads. Remove these (they are the emulsion tubes) Now you need a thin flat head screwdriver as the jets sit under these which is quite far down into the carb. Once unscrewed a cocktail stick pushed into them will pull them out. Don't mix them up!

[calvinhorse 870]

cheers jrod! and they both need drilling?

[Jrod 7]

I wouldnt drill them myself, I'd hunt for someone that can supply them.

 

If you pull them out they should have numbers stamped on, only the bigger one needs replacing/drilling.

[swordfish210 20]

I wouldnt drill them myself, I'd hunt for someone that can supply them.

 

Why not, it's hardly difficult.

[Jrod 7]

Unless you have a spare theres no going back.

[swordfish210 20]

Do it properly the first time then. I drilled loads of jets while i was setting up my bike carbs and never had a problem. The materials so soft you could probably wind the drill bit through by hand.

[calvinhorse 870]

i have a very excellent engineer doing it for me.

 

so only drill the bigger of the two jets? one is marked 120 the other 130.

[RP1983 4]

Do it properly the first time then. I drilled loads of jets while i was setting up my bike carbs and never had a problem. The materials so soft you could probably wind the drill bit through by hand.

 

 

Funny you say that as I have been told with my bike carbs to clamp the drill bit in a vice and wind the jet onto it. Apparently this way you run less risk of the hole ending bigger than intended due to drill chuck movement etc.

[trogboy 17]

I think I'd be tempted to make sure I had a spare first too 'cos if you drill the jet and find it's worse you've got no option but to live with it until you can source another jet.

 

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