sherco tunes husaberg!

:lol: :lol: :lol:

i knew that would get ya going!

i have some numbers for you!

when i rebiuilt a sherco a few weeks ago i noticed that the sherco had a far lighter camdrive assembly.

Top Gear
the camwheel has the same ID (and OD) fit onto the cam, and the cambolt holes and mechanism for the auto decomp weight are in exactly the same place. the large drilled holes are all the way around the sherco gear so the weights were 110 to 80gms. the 4 holes or so on the husey wheel are all on one side.

Crank Gear
the bottom gear has the same ID, the same woodruff key slot, the same width but with the sherco gear sitting back 1mm from the edge (nearer the crankcase). the bottom gear arrived today and the sherco item is 8gm heavier.

Chain
as you know the sprockets have 15/30 with husey but i counted 18/36 on the sherco. so that will tell a technician the chain size (which i don't hold here). the sideplates wree very light. like the japanese they believe in more contact area for better wear. the 450 sherco chain is about 12% longer than the 650 as it runs from the crank but the weights were 246gm (inc a snapped link which we'll call the soft link included) for the sherco and 294 for the husey so when shortened means 220 to 294. the husey doesn't have the split link in it's weight!

i've seen the swing weight and it's lighter and smaller than the husey again! the early ones were prone to failure according to gary grover. so i'll sort that out.

remember, if you aren't running the 53 or 55 cam you aren't producing the nasty pressures on the cam gear. i am fitting the dual springs next month so the springs and the cam profile of the LX2 mean i'm on a surefire winner!

i will be fitting all this at my imminent rebuild during which i'll have a chance to address that ugly rib in the middle of the tensioner blade !

this is a bolt on replacement for all SM riders, roadracers and MX boys. or little boys with little willy's that ride a 400!

this is to be known as 'Taff's sherco camdrive' - unless anyone has a better name for it?

regards

Taffy

sometimes i think i'm just p-h-u-k-i-n gggrrrreeeeeeeeeeeaaaaaaaaatttt!!!!!!!!

ha! ha!

Kez
the only thing i don't mod is the cam.....

"taff's train"

here's one lineaweaver DIDN'T DO EARLIER (blue peter eat ya heart out). respect to DL from DL.

regards

Taffy

i agree 100% but as you look through all four engines you begin to realise that it started with husaberg, then went to KTM, then beta and finally sherco. it's evolution.

the max revs of the cam is about 5,000rpm and i'm not sure how out of balance or HOW IMPORTANT the balance is.

certainlty if they cared i feel they would drill the nose of the cam lobes and ui hope you would agree on that?

everyone else does!

regards

Taffy

RE: Re: RE: sherco tunes husaberg!

kez

i thought you were on about my 'appendage'!

gokai

i haven't had a beta engine apart but would love too just to see the difference. it's most defo not a ktm engine with a badge, as i understand it the beta is made by ktm. beta make all of KTMs schoolboy mx (etc etc) bikes.

i was asked to describe what i thought of the sherco today and after 3 long days on it i would say that it and the beta have far better suspension. the sherco handling is as good as the huseys and with the Fi it is out on it's own as regards touch the button and ride, no coughs, no splutters. so ride wise i think it's a better bike.

it's the build quality and the electrics that have to come up. the build quality is just about there. but the electrics? well you won't believe this but they've tried too hard! they bought thee best connectors they could! the ones with the triple rib in a bright colour as you press them together. but the water has still been getting in and because it got in and couldn't get out it has caused troubles....

BTW, the cams probably have more lift than husabergs due to shorter arms but i didn't have a chance to measure it.

regards

Taffy

RE: Re: RE: sherco tunes husaberg!

well i'll let you know first froggy

i did my last day for them today. they have insufficient funds to employ me. they love my work but they have only sold 2 bikes in 2 months. they hoped to be doing 5 per month. so i'm back out there again!they may use me when needed but they have a s/e mechanic who lives on the door and i guess he'll only work when they have business. i'm 64 miles away and as you know froggy - they aren't texas miles. there's about a million people and cars between me and st albans!

as people ask questions i'll explain what they have done wrong and why they ahve failed.

regards

Taffy

RE: Re: RE: sherco tunes husaberg!

the photo is of the old chain draped near the new one. look how jewellery like the sherco chain looks!



below are the two camwheels together and note the different drill holes in the wheels. the gear on the right is the sherco gear with 36 teeth while the gear on the left is the husey one and has 32 (as usual!). note also that the sherco gear has two alignment dots to go on top of the cylinder head for cam timing.

the sherco gear has already been slotted in anticipation of the timing NOT being spot on!


cheers in anticipation eric :lol: :lol: :lol: :lol: :lol:

regards

Taffy

RE: Re: RE: sherco tunes husaberg!

ok

the cam i lent out got back yesterday after nearly two months away. and all the guy did was look at it!

anyway, tries to fit the camchain and it was a tooth short and floppy or it was only actually half a tooth short. so i removed the headgasket and the camchain tensioner blade and it fits. tried to fit the tensioner again and it won't fit. so got an old mk1 tensioner out and it does fit!

realistically though, to fit a later blade and the headgasket (1.6mm) i need to lower the head by 2mm. the 450 (117mm opposed to my present 120mm) con rod is 3mm shorter which is either Ok or 1mm too much.

i have alreadt had the head and the block lightly skimmed to 'clean them up' so i'm not sure where a standard bike would be.

added to this i have lost my squish gap. the last few times the bike has been running with the petrol in the sump means that the oil degraded and the piston is tapping the head on the exhaust side. the piston is 6.5 years old now so the poor girl deserves a break.

if the big end is going south then this is a good time to go full tilt at the 3mm shorter rod and 3mm off the cases.

radical or what? (what isn't the answer!)

regards

Taffy

RE: Re: RE: sherco tunes husaberg!

yeh! i've decided to reverse everything and lost a day today. i am now back as was with everything.

my dilemma is this.

discovered 'the shot blast look' around the rim of the piston squish at the exhaust port end. means b/e are going i reckon.

this therefore means new rod and big end assembly.

so now if i was to go to 450 rod - it is the time! this is almost too much for what was a bit of fun. i've only had to pay for one gear as the cam gear and chain were free.

gotta skim the crankcases so there is no going back!

Dr C
what i can do i hope is try this one in the engine of a 650 i have to rebuild. i can say this in public because all i'll be doing is offering up the two gears and chain and will see where it pans out?

regards

Taffy