Heavy Hitters / 02 Viper

Motorhead

Motorhead

Member
Joined
May 2, 2003
Messages
37
Age
69
Location
Augusta Maine
I have a set of the HH48 just sitting here, and my wifes Viper which has an over rev issue. Already tried adding weight to the tip and also tried different helixes and twists. Carbs are all stock jetting, and the power valves have been cleaned and adjusted. All bearings look good, so now I will try this set of HH that are just sitting here. Does anyone have a starting point set up for use with all stock primary and secondary springs...
 

I sent him a PM a short while ago after doing a bit of research noticing that he and his dad use them on their Vipers. But thanks for posting.
 
No hits, so I will have to wait and call Thunder Products tomorrow and see if I can get a set up from them, I will post the set up once I get it and fine tune it. Don't want to start from scratch, it would take many clutch pulls,I'm sure...
 
Spoke with a gentleman from Thunder Products concerning my needed set up. I was told that he did not have a set up for me utilizing the stock primary spring, but he had no doubt that it could be done with time, but their set up has been tested and should put me close. So with that being said I went with his set up which included buying a black primary spring from them... Cheap enough around $15.00

The rest of the set up goes as follows.

Heel 1/4 " allen socket = .9 grams

Mid hole steel bolt 3/8" head @ 2.6 grams + steel washer 1.4 grams = 4 G

Tip hole steel bolt 3/8" head @ 2.6 grams + brass washer .4 grams = 3 G

I am waiting for the primary spring to arrive, but though it will be installed once here, I am not sure this season will allow time to test it out, whereas I am still playing with the other Viper in the family (Bender piped etc. etc.) and the riding may be down to a couple of weekends for me !!

Anyways, hope this helps any future Yamahead that is in need of the same set up starting point, through a simple search on this forum...
 
That should get you close. I'm sure you got my PM by now. I think it all depends on how strong your Viper is on how much weight you can throw at it. I think the 3/8 steel in mid and tip are a for sure. From there you may have to tweak the mid and tip washers for your machine. As said in my PM I am running the 3/4" heel allen and it's mainly for the bottom end holeshot and doesn't tend to bother the mid or top end shift. If they don't have the primary spring for you, cross reference a Yamaha spring that figures out to 150lbs/300lbs aka 68kg/136kg maybe drop a bit on the preload and shift rate and add a couple spring shims which will raise your engagement a little more. I like mine around 4200. Also you need a silver secondary spring with 47 cam @60deg. The stock red doesn't work that well with the HH's.
 
Thanks for the post Journeyman, I will look at getting the silver secondary for this set up. I had to pull my clutch twice so far,although there isn't much riding local I was able to take a short spin and found that it was still spinning at around 9000 and the engagement was at 4500 and that came in too hard.. So I added 2 grams to the tip by using the 7/16 steel bolt with 2 brass washers, and then replaced the 1/4" allen with a 1/2" allen in the heel.

I will need a longer spot to run on to tell for sure, but it now spins at 8500 and the engagement is at 4200ish.

So, next up will be the 3/4" allen in the heel and that siver spring and hope that it works nice for next year, because that one(wife's sled) is done for the year unless winter comes back. For this weekend the boys are heading up country for a ride and my piped viper will be looking for some speed against others. Last time out 120 on the dream meter on packed snow! Hoping for some ice trails...
 
Which pipes are you running?

PS: on the stock mine runs best if it tachs right at 8500 and then creeps to 86 or 8700 on a long pull but no higher.
 
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