Author Topic: So you think you can use a Blaster Piston??  (Read 3540 times)

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Offline Zrt1200

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Re: So you think you can use a Blaster Piston??
« Reply #10 on: August 03, 2014, 01:14:13 PM »
Shorts and Fred. I have moved the ring end gap locations on race snowmobile pistons so Yes it can be done. But it is a lot of work. You cant pull the old pin out so you have to grind it off with a cut off wheel. Then set the piston up in a mill. Use a very small end mill to plunge a hole to the ring land, Then drill and ream a hole so you can press in new pins.

So now that you have the pins in place you will have approximately 30 to 35lbs more cranking compression which likes to detonate. The next colder heat range plug helps as does retarding the timing. I just used the next colder plug which is a B9 heat range along with Rec90 fuel we have here. Its 90 octane and is Ethanol free. With those two i rarely had spark knock.

If you are going to use a Blaster piston i would recommend re cutting the head 1/2mm deeper and cutting the 3mm off the piston skirt as the skirt is insanely close to the crankshaft. I was surprised it did not hit!!

Now that you have all that done. I see know problem using a blaster piston. But in my opinion its way to much work when the IT200 piston is readily available.

Al
Current bikes, (82) IT465J, (85) IT200N, (05) GasGas 200, (11) DRZ400S, More photos can be found at.....

http://s582.photobucket.com/user/Zrt1107/library/dirt%20bikes?sort=3&page=1

Offline fred99999au

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Re: So you think you can use a Blaster Piston??
« Reply #11 on: August 03, 2014, 01:35:01 PM »
IT200 pistons arent available in the same range of oversizes though, Al. Thats why I bought the one I did as it is .25 bigger than the largest available Wiseco or Wossner IT200 piston.

Offline Zrt1200

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Re: So you think you can use a Blaster Piston??
« Reply #12 on: August 03, 2014, 01:43:38 PM »
IT200 pistons arent available in the same range of oversizes though, Al. Thats why I bought the one I did as it is .25 bigger than the largest available Wiseco or Wossner IT200 piston.

I take you bought a 68.25mm piston then to use the cylinder for one last bore?? I am thinking may be the DT200R piston might have been a better option. I was looking at the Wossner book and you can get those pretty big.

I just looked. You can get the 1990 Dt200R piston from 65.5mm to 74mm. What i dont know is if the dome height and skirt lenght will match up or the wrist pin width??

Al
Current bikes, (82) IT465J, (85) IT200N, (05) GasGas 200, (11) DRZ400S, More photos can be found at.....

http://s582.photobucket.com/user/Zrt1107/library/dirt%20bikes?sort=3&page=1

Offline rodeobob

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Re: So you think you can use a Blaster Piston??
« Reply #13 on: August 06, 2014, 12:36:45 AM »
Thanks for that Al, top work, I am in the same boat as Fred nines, got me a blaster pot (now for sale  ;D)

shorts

I think I will message you about that one.
DT200R- Im for sale
DT175 '90
RG250WD
Builds in progress.
TIT175
YZ200WR 
RZ250K- Im gunna be special.
VictIT- A very sad Victa 8-34E (8HP 34") Ride on that im going to set right. IT175 motored racing mower, i mean how can you call it a Victa if its not a 2T.

Offline Zrt1200

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Re: So you think you can use a Blaster Piston??
« Reply #14 on: August 06, 2014, 01:28:38 AM »
I think I will message you about that one.

Bob I will look for your PM.  AL
Current bikes, (82) IT465J, (85) IT200N, (05) GasGas 200, (11) DRZ400S, More photos can be found at.....

http://s582.photobucket.com/user/Zrt1107/library/dirt%20bikes?sort=3&page=1

Offline Zrt1200

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Re: So you think you can use a Blaster Piston??
« Reply #15 on: July 17, 2017, 10:42:22 PM »
Here are the pics that was Posted on Photobucket. As you can see the blaster piston ring end gap is right at the edge of the transfer port. I was surprised that it did not catch a ring in the port. Also notice the Deck height is taller with the blaster piston and the skirt length is longer. No wonder I had a lot of spark knock/detonate. Al
Current bikes, (82) IT465J, (85) IT200N, (05) GasGas 200, (11) DRZ400S, More photos can be found at.....

http://s582.photobucket.com/user/Zrt1107/library/dirt%20bikes?sort=3&page=1