jetting 175lc

[perence23]

hello i need some advice jetting my 175lc.
its got a 350 f2 carb
swarbick type exhaust
autisa 175 2m o/s
k&n (although now got an airbox which could fit)
premix.
what kind of size am i looking at its got a 255 when i got it but i dont think thats high enough :/

[looey]

If it's an YPVS 350 F2 carb then it should be a "Powerjet" Carb (rubber tube running diagonally down the side of the main body ?) and on full throttle they use another jet in conjunction with the main jet so they use a smaller main than you think.

I would deffo fit the std airbox, remove the inlet snorkel and maybe fit a k&n or pipercross filter element.

I have no idea about jetting one to run on a big bore 125LC, sorry

[twostroker]

as half of a rd350 ypvs engine is 175cc i would set the carb back to standard and carfuly work from there,dont quote me on this but i think as stanfard f2 powerjet carbs are only something like a 185.

ps as you have a carb with a oil feed nozzel why not run auto lube to make setting it up easier?

personaly i would fit the whole air box and re-fit the auto lube too.

[perence23]

It came with a k&n but since then i have got hold of an airbox, had the top end rebuilt i believe its like 186cc now with 350 powervalve carb ( yes it does have the rubber tube) I am going to premix it because then i am sure whats in my tank just to be on the safe side.

[perence23]

if its a 185 standard on half a 350, with premix, exhaust and filter it should be about 225 im thinking. does this should about right ?

[tsa]

Get youself a Keihin 28PWK carb they are much better than a Mikuni VM carb.

[perence23]

i think i will run premix. Does 225 jet sound about right though?

[looey]

225 sounds like a good/safe place to start mate, might be rich if anything but you can always down jet but filling a hole in your piston is a whole different ball game.

If you've made your mind up on the premix then fine but it will be a pain in the ar*e if you're gonna use the bike regularly and do some miles. But like Gaz says, the only way to get the correct amount of oil at all throttle/rev combinations is with the pump, as it has the flexibility to deliver the correct quantity of oil based on revs (by the oil pump plunger speed) and throttle position (cable obviously).

Having said all that, as long as you've got a good ratio then you should be fine. I've got an X7 that runs on premix (33:1) but it's a temporary measure until the proper engine is finished and installed (which will then run on autolube) and me the Fizz which is premix from the factory.

What I do is keep a can ready mixed up for each bike in the garage (they run on different ratios) and when I go out I make sure the bikes are brimmed and take a bottle of oil that has enough oil for 2 refills

I think your main concern will be with this big bore kit, as history has shown that they don't seem to produce much more power and have proven to be pretty unreliable .

[twostroker]

I think your main concern will be with this big bore kit, as history has shown that they don't seem to produce much more power and have proven to be pretty unreliable .[/quote]

this is only usualy true because its tricky to set the bike up correctly with a big bore kit,for example with the exhaust port duration being different with the new barrel idealy you will want a exhaust built to the spec needed,carbs as tsa said a pwk28 is far better and then a decent set up and you should see near on 28-30 bhp.

it is possable to just run a off the shelf exhaust and a standard carb but i doubt it will be much quicker than standard.

[looey]

My point exactly, if the unrestricted bike is 21hp out the box, it's a whole lot of pain, effort and parts to make it run right and not that much faster than a well setup std engined bike !.

Hey, each to their own, personally I'd wait until I'd passed my test and buy a 250 or 350LC

[looey]

Except on RD80LC's........ lol ;D

[perence23]

only got the kit on it because it came with one on it when i bought it. i was going to put the 2mm o/s standard barrel but the exhaust bolts have been broke so need to get it fixed. shouldnt be long till fharon gets it finished though

[perence23]

i would love an 80 tbh going to keep my eye out for one when i have sold my honda innova no room atm :/

[LC'Adam]

This best be a joke Gaz, it looks the proper old skool style. You will never ever come across another bike like it. Its awesome!!! ;D