New pistons

[NickyPap]

I recently had a new set of weisco ported super stock pistons put in and they sent a new jet kit to go w/ it. I have a friend that owns a local bike shop and he did all the work. I already forgot what size jets I am running but I can tell you that I have Pro Circuit pro plat. headers and a brand new set of Pro Circuit 304 silencers. K/N filter w/ stock lid on but w/ 6 of those mini filter circles you pop on your lid after drilling it out. Stock carbs. Don't know how far above the sea level I am but I live in southern Maryland. Run my gas 32:1. Plug reading is a nice color.New dirt digger clutch.

Anyways my problem is that it seems like my whole power curve has changed. Pulls much stronger when the powerband kicks in -Hard to keep the wheels on the ground now but I think my bottom has suffered. I have to keep the revs up when putting around. 1/4 throttle seems like choke pulled out after warm up. I took her back up to the shop and he dialed in the carbs alittle better. I said I wanted to bump up the compression with a cool head w/ 20cc domes and maybe try those new vforce 3 reeds. He said that would help my bottom and also said my stock reeds were in good shape.

Oh I almost forgot I have a moose boost bottle.

What do you guys think? Did anyone notice a difference when using these pistons? fars as throttle response what can I do to improve it? Or should I stop acting like a pussy and ride this bitch wot like she wants me too?

Any help would be appreciated and hopefully I posted this in the right section.

Nicky

[Toomey Banshee]

I would guess with the temp change your pilot and or needle jets need some tuning.

[midnite]

Had the same problem. No power off idle [lean] with pro curcit plats. Had to rev it up just to take off at slow speeds. I went from #27.5 pilots to #30 pilots, [1 1/2 turns out on the air screws] and got power off idle. It seems the pro curcits like alot of pilot jet. Oh yeah, I know exactly what your saying about hitting the powerband and jerking the front wheels off the ground. Keep speed shifting, and you'll jerk 'em in every gear. My pro curcits have the same strong hit as my toomeys, they just hit a little lower in the rpm range. Very underated pipe those pro curcits.

Edited November 27, 2005 by midnite

[NickyPap]

Rode all day today. She rips from 1/2 throttle and up but bogs like the choke is pulled anything less. Should I wait till spring to deal with this because it is gonna start getting cold here for the next 2 months. Today was odd for this time of year, upper 60s. And I know it doesn't help not knowing what size jets are in there but w/ my little list of mods can someone guess as to were I should be on the size and setting? Or do you guys think it could be as simple as tunning the carbs?

reading the trouble shooting in this section I guess it has to be the pilot circuit or slide valve. I guess I need to determine what size pilot should be in there. And w/ 2 carbs it makes everything even more complicated and me more nervous to start adjusting something for the first time.

any recommendations would be appreciated.

Nicky

Edited November 28, 2005 by NickyPap

[Banchetta]

Rode all day today. She rips from 1/2 throttle and up but bogs like the choke is pulled anything less. Should I wait till spring to deal with this because it is gonna start getting cold here for the next 2 months. Today was odd for this  time of year, upper 60s. And I know it doesn't help not knowing what size jets are in there but w/ my little list of mods can someone guess as to were I should be on the size and setting? Or do you guys think it could be as simple as tunning the carbs?

reading the trouble shooting in this section I guess it has to be the pilot circuit or slide valve. I guess I need to determine what size pilot should be in there. And w/ 2 carbs it makes everything even more complicated and me more nervous to start adjusting something for the first time.

any recommendations would be appreciated.

Nicky

442316[/snapback]

Midnite already answered your question. You need more fuel on the pilot circuit w/ pc pipes. Put some 30 pilots in there. You must have noticed that it starts hard now to....larger pilots!

[NickyPap]

Thanks.

I hope I didn't make my question confusing. The whole mystery is that the main thing that was changed is the pistons and supposedly the new jets that came with it. I also put a new set of silencers on because he had a set hanging at the shop and mine had a dent in one but I don't think that changed much.

Another wierd thing is that she starts right up but seems to rev higher until warm up.

Bogs more down low but pulls much stronger up high.

Thanks for all the replies and I'm gonna take it back up to the shop and check into bigger pilots -hopefully that will smooth out the hesitation.

I ride alot of trails and she just aint right for trails like this.

[Banchetta]

Thanks.

I hope I didn't make my question confusing. The whole mystery is that the main thing that was changed is the pistons and supposedly the new jets that came with it. I also put a new set of silencers on because he had a set hanging at the shop and mine had a dent in one but I don't think that changed much.

Another wierd thing is that she starts right up but seems to rev higher until warm up.

Bogs more down low but pulls much stronger up high.

Thanks for all the replies and I'm gonna take it back up to the shop and check into  bigger pilots -hopefully that will smooth out the hesitation.

I ride alot of trails and she just aint right for trails like this.

443531[/snapback]

I tried a set of pc pipes for a week, I couldn't pull them off fast enough.....I ride a lot of trails, sand pits, etc.....those are the last pipes I'd use...you'll go through a lot of clutches trying to stay in the powerband on the trails...get some midrange pipes and you WON"T be disappointed. Certain pipes for certain riding...Pipes are everything..