I have P80X (V8X1T) and I want to upgrade it a bit. I do not want to do any extensive tuning just small upgrades.
Top speed is good (around 80 km/h) but acceleration is poor. Also I have some problems with carburetor. I do not need higher top speed (around 90 km/h would be great) just better acceleration.
My plan is to buy DR135 or Malossi 139 (first question - which?), 24/24 carb and maybe new clutch (do not know what I need? only plates with springs, basket too, or everything?)
Can you help me choose which kit and what else to buy. You can also put some links so I can put it in my notepad :)
I don't think you need a 24mm carb, you can rejet your 20mm to PX150 spec maybe + 1 or 2 on main jet size ?? Your clutch is a difficult one, I seem to remeber the 80 version having a different primary drive ?? This will limit the Clutch cog choices. 90 kmh is very modest and easily achievable with a bolt on kit { Malossi I prefer ] , rejet your carb and maybe change the exhaust to a Sitoplus or Simonini.
Do I have to rejet the new one or it will be good out of the box? I see there are jet kits with several jets inside. Are they for some fine tuning or what. I thought if I need to buy that pack and new needle than I could just add some more mone and buy new 24/24 one and just put it.
Let say I want to renew the old carb. What do I need (with 135 or 139 ccm kit)?
Problem is in idle and fuel spill.
About the clutch. Maybe to buy whole clutch with 21 cogs? Something like this
[quote user="Hamer"]The 21 tooth clutch will raise your gear ratio so you will have a little less acceleration but more top end speed available,, you should also remember that the kit will be a relatively huge increase in available power so will compensate for the raised gearing.[/quote]
I want more acceleration. Top speed is not important. It is better to leave it like this than.
[quote user="Hamer"]when you say the clutch is difficult to start without jumping - do you mean difficult to kickstart and needs to be push started, or that the clutch grabs and lurches when start it first ?[/quote]
I mean that the friction area is too small. It jumps because I feel like there is on/off button on the clutch. It is easy to kickstart. If I start in first with little throttle it dies and when I twist the throttle it jumps and goes wheelie a bit. It is hard to dose the clutch.
[quote user="Hamer"]I would suggest you think of spending a little money on a Simonini or SitoPlus if you can and then you really will see the benefit of the other money you will be spending.[/quote]
Which one would you choose? I see there are 3 visual types. Right ones, left ones and original type. I like the original type because exhaust is hidden but maybe 24156000 would look nice too.
So far... Malossi 139 or DR 135, renewing and rejeting old carb, changing cruciform, replacing all seals, changing exhaust? and learning how to start :)
Remember to use a slightly colder plug like B8HS and set the gap to 0.55-0.6mm , check the colour of the electrode regularly when breaking in the new kit.
If I had to rejet the new one too than I am gonna renew the old carb. It will be more money to spend on something else. Thanks for the art no.
I am thinking of leaving the clutch as it is too. Do not know how many cogs are there now, and will I get some acceleration with 21 cogs. Problem with current clutch is that it has small area of friction so it is rather hard to start without jumping (I hope you understand what I am trying to say :)
I have to change cruciform too (it jumps out and back in the third gear, and now I can fell it in the second and fourth too) so wanted to do as many jobs I can/need when the engine is opened.
As for the exhaust it will stay original one for now.
If you need to change the carb then I agree it makes sense to go with a 24mm, all I was trying say is that if your carb is in working order then you may just as well simply rejet it to suit. Perofrmance will be better but I thought you only wanted 90-100 KMH so either carb will be fine ??
If you want a 21 tooth clutch thats easier to use than the older type Malossi upgrade clutch kit, the go with a new style PX / T5 unit but you may have to modify / change your clutch cover to suit.
The 21 tooth clutch will raise your gear ratio so you will have a little less acceleration but more top end speed available,, you should also remember that the kit will be a relatively huge increase in available power so will compensate for the raised gearing. The clutch I recommended is the later large style clutch and will handle the power increase easier, its also very light to the users hands .Your cruciform change will cure the jumping out of gear, when you say the clutch is difficult to start without jumping - do you mean difficult to kickstart and needs to be push started, or that the clutch grabs and lurches when start it first ?
I would suggest you think of spending a little money on a Simonini or SitoPlus if you can and then you really will see the benefit of the other money you will be spending.
I have some problems with my carb. It needs renewal but I do not know where is the problem. When I dismantle it maybe I will know. I wanted to buy new one instead and why not 24mm model then (in both of cylinder kits it says it will fit 20 and 24) but I expect better performance with 135ccm+24/24 than with 135ccm+20/20, or am I wrong?
93036000 will be the better clutch for you, remember to buy a new clutch nut etc to suit as well.
If you buy an Si24/24E you will probably have to reduce the size of the main jet but leave all other jets as standard ; if you keep the original carb the buy
art no 40090000
art no 92060000
These should cure your fuel spill prblems, the rejetting will depend on which exhaust you intend using. The UK did not have the PX80 sold here so I haven't had many thru the workshop over the years but logic says that jetting will fall between 125cc and 150cc settings for a similar level of tuning.
Ok go with a 4 plate Surflex or DR clutch kit , it'll come with steels , cork plates and uprated springs art no 93090000
If you want the looks then the exhaust you like is ok but it will not perform any better than the one you already have, if you want a standard look but improved performance then art no 23000000 is just perfect.
The Malossi kit will be the better for the quality of the kit and for power right from low revs straight through.