faster7581
Raceaholic
- Location
- bradenton, fl
anyone make 83mm flat top piston?? for yami 701
anyone make 83mm 701 flat tops?
- Thread starter faster7581
- Start date
#ZERO
Beach Bum
- Location
- Florida - U.S.A.
No.... they start at 84mm.
faster7581
Raceaholic
- Location
- bradenton, fl
where can i get them, and do you know if they work with the ADA flat top yamaha domes? thanks
- Location
- Palm Beach, Fl
faster7581
Raceaholic
- Location
- bradenton, fl
is what a joke.
SUPERTUNE
Race Gas Rules
- Location
- Clearwater Fl.
The only way to use a flat top in a Yamaha, is to re-sleeve the cylinder, machine cylinder 4mm shorter, then machine a Kawasaki small pin piston Part # 813M08300.
My question is why do you want a 83mm flat top piston?
If you want power from a Superjet, go for bolt-ons first, then consult a specialist for a properly built setup from there.
My question is why do you want a 83mm flat top piston?
If you want power from a Superjet, go for bolt-ons first, then consult a specialist for a properly built setup from there.
Mike W
Infidel
- Location
- North Florida
faster7581
Raceaholic
- Location
- bradenton, fl
its for a blaster for spec class, cant be over 83mm, already have a limited pipe, 46 bucks(looking for novi 48's) riva manifold, msd enhancer, ADA 33 domes( can only run 185 psi) so i figured flat tops were next.. i found wiseco's made for a yamaha, ADA makes drop in flat top domes for them, but pistons start at 85mm..need 83mm , dont want to go kawi pistons, can't modifiy the cylinder per rules..any other ideas?
thanks for the info, i've built alot of seadoo race motors, new to the yamaha..
mike b
33 cc domes should put you in the high 190's or 200's depending on which cylinder you run(61X or 62T). 35 cc should put you in the range you are looking for. Pm me and I may be able to bounce some ideas to you that may help you out. Long time no see Mike. I don't think I have talked to you since 97, when wade was still in the business. Rocky point M.D. I think you were on the armonds HX. Time flys..................
JAM
JAM
- Location
- Plymouth, MA
I have a set of novi 48's & a Riva intake if you need one.
pat
pat
faster7581
Raceaholic
- Location
- bradenton, fl
whats going? how you been... no more team armands for me. i moved to FL in 99..., my bad , i meant 35 cc domes..i'll PM you later,, im on my way out. talk to you later
mike b
scottie mac
X-
Mike,
Unless you guys are changing something down there, we were limiting bore to one over, which would be 82mm.
Scottie
Unless you guys are changing something down there, we were limiting bore to one over, which would be 82mm.
Scottie
faster7581
Raceaholic
- Location
- bradenton, fl
oops,my bad. im used to seadoo, oem 82mm. anyone make 81-82mm? thanks scottie
faster7581
Raceaholic
- Location
- bradenton, fl
flat tops make a liitle bit more hp.. not a huge increase.
#ZERO
Beach Bum
- Location
- Florida - U.S.A.
It's around 2% more power with flat tops and they're lighter so the engine will rev up quicker.
You can use the small pin Kawasaki 750 pistons which have a 2-degree dome in the 82mm size but the ring locating pins will overlap the auxiliary transfer ports and may cause you to snag a ring end.
Also Scottie is right saying 82mm is the limit in for your class.
You can use the small pin Kawasaki 750 pistons which have a 2-degree dome in the 82mm size but the ring locating pins will overlap the auxiliary transfer ports and may cause you to snag a ring end.
Also Scottie is right saying 82mm is the limit in for your class.
crammit442
makin' legs
- Location
- here
According to some builders...... Since a direct comparison(with no other variables) between FT and domed motors is almost impossible, the flat top theory is really only a theory. Flat top motors don't always produce more power over otherwise similar domed motors and the reverse is also true. I personally believe the expense and complication of flat tops makes any (possible) small advantage they(might) provide negligent. Plain old Wiseco yamaha pistons are available from almost anywhere and at reasonable prices. I challenge you to ride a well built domed motor and feel or measure the difference. There are so many other factors that make bigger differences. IMO the flat tops are just another distraction(and expense) that don't produce results equal to the hassle involved. FWIW, if I was building a Kawi motor I would absolutely use flat tops since that what they come with. I don't believe they're bad, just nothing special. Just my opinion.
SUPERTUNE
Race Gas Rules
- Location
- Clearwater Fl.
According to some builders...... Since a direct comparison(with no other variables) between FT and domed motors is almost impossible, the flat top theory is really only a theory. Flat top motors don't always produce more power over otherwise similar domed motors and the reverse is also true. I personally believe the expense and complication of flat tops makes any (possible) small advantage they(might) provide negligent. Plain old Wiseco yamaha pistons are available from almost anywhere and at reasonable prices. I challenge you to ride a well built domed motor and feel or measure the difference. There are so many other factors that make bigger differences. IMO the flat tops are just another distraction(and expense) that don't produce results equal to the hassle involved. FWIW, if I was building a Kawi motor I would absolutely use flat tops since that what they come with. I don't believe they're bad, just nothing special. Just my opinion.
I will basically agree, The biggest advantage with most flat top pistons that they are shorter deck height and will be a much lighter piston, even more so now that Wiseco pistons are not lightened as much as they used to be when they really pushed them as Pro-Lite pistons. (heaver now, but still lighter than stock cast pistons)
In freestyle it can help with a faster accelerating engine response.
#ZERO
Beach Bum
- Location
- Florida - U.S.A.
Another flat top advantage is shape does not interfere with the entry & exit angles set by the ports and the ports can open faster because they're not masked at partial opening by the chamfer. Also the piston crown is under load with the flat top design which gives faster heat transfer to the cylinder wall and with the dome pistons it tends to spread the compression forces more toward the ring lands. This is why the Wiseco dome pistons use the thicker style KD rings and the flat tops use the thinner TD low tension rings with less engine drag.
- Location
- Victoria, BC
Where can you get a flat top 84 mm piston? Im looking for one for my 701 (with 760 sleeves)