ascott 500 head swap onto a 350x.... with pics

[SWIGIN]

my buddy called up micky dunlope and he said for his old 505cc motors they needed to use custom clutch springs to get them to hold.

he also told him that normal hd springs are junk and and are made for stockish motors.

so now we are going to measure the highth and diameter of some barnett springs and see if barnett can give us the poundage of these springs and see if they have a spring the same size with more presure.

if not we are going to check into valve springs....acording to micky with the ''right'' springs and a easy pull lever it should be hard to pull the lever in...as in real hard like a grooved basket.

he said he used to get custom springs made just for 350x monster motors but that was years ago and the source dried up....wish i had a spring scale to measure spring strength but now there is hope

[lndy650]

try calling Tom Carlson i talked to him before and he seems to be a helpful guy.

[The Goat]

what about a spring shop in your area. I know there's a place around here that makes custom springs, no idea on the price though.

i got some defective ones back in highschool to build a catapult.

[lndy650]

814-723-3514

[Billy Golightly]

You can measure the tension of springs by compressing them on a regular old bathroom scale and see how much weight it takes to compress them a 1/2 or an inch at a time to find the spring rate.

[SWIGIN]

try calling Tom Carlson i talked to him before and he seems to be a helpful guy.

iv bin to his house....he keeps things like i need to know to himself

he used to offer a clutch mod for this type of problem.....im starting to think it was just real heavy springs and maybe the extra disc

[SWIGIN]

You can measure the tension of springs by compressing them on a regular old bathroom scale and see how much weight it takes to compress them a 1/2 or an inch at a time to find the spring rate.

i had the same idea......put the scale and springs in the press and go a certian amount to see witch is stronger


you were on the right track with the lockup deal.....but i think id need a new clutch cover to get that to fit

[SWIGIN]

what about a spring shop in your area. I know there's a place around here that makes custom springs, no idea on the price though.

i got some defective ones back in highschool to build a catapult.

we have spring places too but small heavy springs are kinda hard to get made.....only a few places make small atv size springs that are heavy enough

[SWIGIN]

ok at 1/2 inch compression stock 350x clutch springs are 53 pounds

stock 350x valve springs are high 40's and ascott valve springs are 50

i'll update this as we get to try more springs

[Billy Golightly]

I'd look into some that came off streetbikes or something. I think I've read FZR600 springs interchange with banshee or something, so its likely others do as well.

[The Goat]

my new R&D valve springs are RIDICULOUSLY heavy. I'd say well over 60 pounds, i honestly couldn't push them in with my thumb, and where I can easily squeeze one of the stockers in my palm...the R&Ds took a bit of straining.

just a heads up.

[SWIGIN]

my new R&D valve springs are RIDICULOUSLY heavy. I'd say well over 60 pounds, i honestly couldn't push them in with my thumb, and where I can easily squeeze one of the stockers in my palm...the R&Ds took a bit of straining.

just a heads up.

lol....thats not ridiculous enough

old worn out barnett springs ended up being 72 pounds and new vesrahs checked in at 75....the same as new barnetts

so the 4 new barnett springs that arnt holding is putting 300 pounds of presure on the clutch pack.

we did find some valve springs that will fit and they have 120 pounds each....once we get them and try them i'll post how they work.... but i think we are on to something

[lndy650]

i wonder how its going to be pulling 480 pounds with a clutch handle

[lndy650]

iv bin to his house....he keeps things like i need to know to himself

he used to offer a clutch mod for this type of problem.....im starting to think it was just real heavy springs and maybe the extra disc

now that i think of it that dosent suprize me i have a TC 350x head ported and oversized valves for a 450 big bore and he refused to tell me where to get the oversize valves. i think they were 32mm in. and 30mm ex.

[SWIGIN]

i wonder how its going to be pulling 480 pounds with a clutch handle

not to bad..... i would say my clutch pull is on the soft side with barnett springs.

and at 75 pounds each thats 300 pounds so this is only 180 over that...there is always easy pull levers and easy clutch things plus you can always ad lenght to the clutch arm for more leverage.

the pull is the least of my worries as long as we can get it to stop slipping. ever ride a bike with a grooved basket? once your on the track you dont even notice things like clutch pull....till the end of the day....lol