Pages: 1
Posted by: Raptorlegs
For about $600, I'd start out with a pipe, carb, high compresion head and clutch kit. Then get some port work down the road when the top-end needs freshened.
Posted by: Raptorlegs
A modded 70cc will run circles around a stock 90. And I've yet to see a stock 90 do well in sand either. Don't waste your money.
Posted by: Raptorlegs
Ohhhhh....If you own am impact wrench and ratchet set, it's fairly easy. Only hard part is letting go of the $$$. But trust me, it's kept me from pushing my kids up every dune we come accross. Now, she can pretty much climb anything I would ever want a 7 year old on.
Posted by: Raptorlegs
Gearing alone won't cut it. You'll have to spend a little for parts. I have everything I listed done.
You'd need the impact wrench to put a clutch kit in. You can make that mini scoot pretty good if you want. I'd contact a builder, like Billy Holt at WRH. There are a dozen guys on here that have been in your shoes and will bend over backwards to help you with the installation. Hard part is tuning the clutch and getting the jetting right. It's easy enough but a little time consuming.
Posted by: Raptorlegs
Quote
Originally posted by: simtis
Recommendations for the pipe? Can i just re-jet the stock carb? What clutch mods? I assume i will want to replace the air filter as well.
WRH, yes but a keihin would be much easier to tune, lighter rollers and tighter springs (maybe an aluminum clutch), and I would add a K&N or Uni.
Posted by: oldyeller
Unfortunately the stroke is longer on a 90 than on a 50 /70 so its not an easy upgrade to make it a 90 unless you want to swap the crank as well.It's probably much cheaper to just mod the 70 unless you can find a 90cc engine and mod it instead.........Spike the 70 and 90 are the same size,just smaller tires and wheels on the 70.
Posted by: oldyeller
Quote
Originally posted by: onreserve
I'd sell it and buy her a 90cc quality machine kymco , honda, polaris, artic cat etc..
In stead of investing any more.
The other will give you all that you need with no mods.
onreserve I'd put the Viper up against any of the"quality" machines you listed.
Posted by: spike99
.
simtis: Welcome to this forum.
If you drive on trails that have strict age to engine size CC laws, you may NOT be able to legally upgrade to a pure stock 90cc mini. Thus, your best option is to upgrade the 70 CC - with the mods Raptorlegs mentioned.
Depending upon the "soft sand" depth and looseness, you "may" have to upgrade a pure stock 90cc as well. Most pure stock 90CCs are made for "average" trails that include some sand, some gravel and minor hills. If your riding area is extreme soft sand with lots of hills (like extreme sand dunes), then upgrades to a pure stock 90 may be required as well.
Of the brands suggested, the artic cat will need its factory many restrictors removed, the Polaris has weak wiring / stator, the honda is a 4 stroke that involves shifting (but great for water / crud conditions) and the kymco has a reputation of a solid 2 stroke with disc brakes. If you are pleased with the E-Ton brand and are NOT restricted by local riding laws, upgrading to an E-Ton 90 (instead of beefing up your existing E-Ton 70) might be worth it in the long run. If it were me with no law restrictions, I'd probably upgrade to an E-Ton 90 (body sizing thing) and if more power is needed for soft sand as the rider gets physically bigger, upgrade the pipe, air filter and install CVT upgrades. I'd only upgrade these areas "if needed" in the loose sand with larger body size (during a 3 year period).
Hope this helps as well....
.
Posted by: spike99
You are right Raptorlegs.
In thinking of the bigger picture:
- What's the age to riding CC restrictions in the young rider's area? If public trails, gotta stick within the law's of the trail.
- What's the current physical body size? If a large kid, like my son, then his knees could be kissing his chin - on a 70cc mini.
These things have to be taken into account as well.
.
Posted by: Fastestdad
For $400 you can make that 70 absolutely rip up the dunes. Pipe,carb, clutching mods. We ride dunes alot and sand drag and a 70 is a good starting bike to mod a little.
Posted by: HQR109
unless you have a very deep pocket you cannot make a 70 a 90. a 70 is a 50 with a bigger bore. the 90cc crank will not fit in a 50 case unless you do expensive machine work to it. been there done that. you can make the 70 scream and smoke all stock 90's expecially the quality list given above.
Posted by: onreserve
I'd sell it and buy her a 90cc quality machine kymco , honda, polaris, artic cat etc..
In stead of investing any more.
The other will give you all that you need with no mods.
Posted by: simtis
My 95lb 9yr old lovers her Viper 70 and for the past year we have had no mechanical problems at all. Unfortunately, it doesn't do well in the soft sand. I know there are many aftermarket parts out there to boast the power a bit but i'm not sure it is worth it to drop $600+ on a big bore kit, exhaust, etc... will bumping this engine up to 90cc solve the problems in the sand?
Posted by: simtis
Appreciate everyone's informative feedback. It is becoming clear that there in no easy solution for now. Until I can get her onto a full size quad (250cc) she will probably have a hard time in the soft stuff. She is 56" tall and 95lbs so physically she fits pretty well on a Honda 250 but she is not mature enough or strong enough to handle a 250 yet, plus she is not 16.
Posted by: simtis
I have an impact wrench and a socket set...are you talking about changing the gearing? Down a tooth un the front?
Posted by: simtis
OK,
I think i will leave the displacement alone for now.
Recommendations for the pipe? Can i just re-jet the stock carb? What clutch mods? I assume i will want to replace the air filter as well.
Posted by: bassman777
Hey guys Lets give E-ton some credit, before getting my little guy his E-ton Viper 70 , I researched a little about E-ton and every major kids Quad looking for the best machine and looking for safety features , fact is E-ton out performed Yamaha, Honda,Kymco,Suzuki,kawasaki, in 2005 by magazine shootots by three different magazines,ATV Action,Dirt wheels, not counting ATV of year in both kids classes. If you want to read them simply go to Etonamerica.com , Fact is Viper 70 is the best stock ATV ever tested in 6-11 year class , I think they said that Eton beat the others worse than anybody in 20 years of ATV action shootouts[ literally left them sitting in dust ], After a few runs , well it had a collision with a tree , dealer got part in 2 days , that sure beats any brand I ever owned . And compare all E-tons features , Hydraulic brakes,6 in rear suspension travel, electric and kick starting ,brake light ,tail light,horn, wired for headlights, blinking light in front,safety flag,CDI box has adjustable govenor, Maxxis tires, flatslide mikuni carb. Be sure take a look at new 90 Reverse 4 stroke Dual A arm front suspension [ felt like it had 7-8 inch front suspension travel, And Viper 70 is coming out with 4 stroke this month . Kinda wished I had waited [I dont know if it will have dual A arm front Suspension or not] All in all , I looked at every major brand , feature for feature , and according to these shootouts nobody outperforms these guys, Fact is after hours and hours of comparing E-Ton beatem all , Overall a proud and happy E-Ton Owner
Posted by: Robb471
Im having the same question about our Viper 70. What is the best source for parts for this quad? Also, how owuld it run with sand tires?
