125 big bore

dynarex · Post by **dynarex** » Thu Aug 12, 2010 8:40 pm

anyone know if this will work on a ratt 110?
i think it will
http://cgi.ebay.com/ebaymotors/BWS-100- ... 0459653062

tbonestone · Post by **tbonestone** » Thu Aug 12, 2010 9:58 pm

I know something similar was done to a Yamaha Grand Axis on the Total Ruckus board. There might have been some shenanigans to get it to fit, but i think it worked after something or some-other.

bigbropgo · Post by **bigbropgo** » Thu Aug 12, 2010 10:21 pm

Somebody on genuinerattler.com said the crank won't fit. I wanted to buy it bad. He has the cylinder kit only for sale also. That seller is pretty quick to answer questions. I have no first hand experience, but the bws or grand axis kits have worked for others.

dynarex · Post by **dynarex** » Thu Aug 12, 2010 10:28 pm

its cheap enough-im soooo tempted to try it
what do i do?what do i do?

bigbropgo · Post by **bigbropgo** » Thu Aug 12, 2010 11:12 pm

I know exactly what you mean. I almost bought the crank to verify for myself. The problem is the rattler/pgo doesn't have a ton of support yet. So I'm always excited to have verification of new parts.

The shipping is a bit steep from autotech, but its comming from the other side of the world so I understand. They sell the bws in Canada and Mexico. So you may be able to re-sell it if it doesn't work out.

dynarex · Post by **dynarex** » Thu Aug 12, 2010 11:31 pm

just as an off topic i think youd like my new helmet
http://www.motorcycle-superstore.com/1/ ... elmet.aspx

nice lid-works great for vision and wind noise

dynarex · Post by **dynarex** » Thu Aug 12, 2010 11:38 pm

bigbropgo wrote:I know exactly what you mean. I almost bought the crank to verify for myself. The problem is the rattler/pgo doesn't have a ton of support yet. So I'm always excited to have verification of new parts.

The shipping is a bit steep from autotech, but its comming from the other side of the world so I understand. They sell the bws in Canada and Mexico. So you may be able to re-sell it if it doesn't work out.

so as i under stand it -the rat is a bws 100 stroked to 106-which is why the big bore kits for the bws need a spacer right?
so if we stuff a bws crank and big bore kit it should work,uh,maybe?

bigbropgo · Post by **bigbropgo** » Fri Aug 13, 2010 12:29 am

the same Guy on genuinerattler that said the bws doesn't fit, says its more than the length of the stroke. Its the bearing diameter. I can't remember the other fit issues. It was close. I am going by his word.

I am posting from my phone but later tonight I could get a link to the thread.

Vespatech posted about a mallossi kit that needed a spacer. The kit your looking at takes it from 52mm to 56. The mallossi is a 57.5. But at a premium price.

bigbropgo · Post by **bigbropgo** » Fri Aug 13, 2010 12:32 am

dynarex wrote:just as an off topic i think youd like my new helmet
http://www.motorcycle-superstore.com/1/ ... elmet.aspx

nice lid-works great for vision and wind noise

I like it. I think it suits a ratt rider well.

vespatech · Post by **vespatech** » Mon Aug 23, 2010 9:15 pm

I have 5 spacers for sale that will allow the fitment of any bws cylinder kit

dynarex · Post by **dynarex** » Mon Aug 23, 2010 11:19 pm

vespatech wrote:I have 5 spacers for sale that will allow the fitment of any bws cylinder kit

pm me with info-
im all fired up now!!!

bigbropgo · Post by **bigbropgo** » Tue Aug 24, 2010 2:16 am

Me too!

What's the difference between the malossi 57.5mm kit and the bws 56mm. Spacer wise I mean. Just wondering if anybody knows.

dynarex · Post by **dynarex** » Tue Aug 24, 2010 2:21 am

i think they both need a spacer because the rat crank is stroked from a 100
thats how they got that extra 6 cc

what i dont get is why cant we stuff a stroked bws crank and big bore cyl on it?
either way my rat will be bored/stroked/nitrous/supercharged/turbocharged or whatever else i can make work somehow

vespatech · Post by **vespatech** » Wed Aug 25, 2010 9:10 pm

the only difference is in bore the stroke is the same...malossi being bigger!
I have not found a machinist that has the equipment or capacity period to manufacture this piece for a price that is not too expensive. I would tell you what i paid for each piece, but it is embarrassing.

167.50 EACH I would not sell them for this. Put it this way they work but the windows need cleaned up to match the case. not a whole lot of material but you dont want to grind on a part when you pay that much for it. Most of you may feel this way. I will sell them but first make an offer. and we'll see how i feel about pursuing a waterjet and having a dozen or so made.

dynarex · Post by **dynarex** » Wed Aug 25, 2010 10:03 pm

im still not too clear on why the rat needs a spacer if the crank is swapped out

vespatech · Post by **vespatech** » Thu Aug 26, 2010 3:42 pm

why would you remove a quality stroker crankshaft? you could make another fit by equipping the proper size bearings but then you are limiting displacement. modified tranny and flywheel may be necessary as well. I just dont think it would benefit.

dynarex · Post by **dynarex** » Thu Aug 26, 2010 5:06 pm

so in your opinion the stock crank is a quality one?
if its a good one then ill keep it-but the malossi has got to be better no?

vespatech · Post by **vespatech** » Sun Aug 29, 2010 2:50 pm

A stroked crank will lower the torque curve in an rpm range.
It depends on what you want out of the engine.

dynarex · Post by **dynarex** » Sun Aug 29, 2010 6:11 pm

im def on the hunt for torque
i like the rat crank-just wondering how durable they are

vespatech · Post by **vespatech** » Mon Aug 30, 2010 4:12 pm

the crank is good. what you need are bearings. the stock ones are sufficient but serious power will require complimented (balanced) bearings.

dynarex · Post by **dynarex** » Tue Sep 07, 2010 9:30 pm

so i went for it-got the boss(wife)to approve an upgrade
going with the 123bbk from scooterworld guam-should be pretty straightforward and work well with the 26carb and v8 pipe