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monteeman

4rt differences

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I was out in the garage earlier, cleaning up and came across a box of trials bits, including chain, spark plugs, levers, 10t gearbox and a 40 and 41 rear  sprockets,, cpouple of inner tubes, some grips, chain blocks oil filters, a clutch master cylinder, some anodised ****, and  a load of mitani silver cabon I kept when I sold my last 4rt. I even had some old fantic 240 stuff in there lol  .its been a while....

I remember it cost a fair bit, back. I suppose at least the filters, spokes and sprockets etc will fit the newer one, which is a bonus....

 

I best get looking for a good deal on a mint standard model I suppose..

thanks for your advice, much appreciated....

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Silver Mitanni carbon will look nice on the latest std models 

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I don't think it will fit. the tank cover deffo wont, the tanks a different shape for a kick off, and the silencer cover also looks different. airbox cover might I suppose, but the mitani stuff,  it looks like its unobtainium these days. pity, because  its really well made, unlike the cheapo stuff. I gave away my mitani titanium front pipe when I sold my last 4rt, bit gutted about that but you never know what the future holds,

I thought I was done with trials. but theres life in the old dog yet....

 

I will keep you updated, I might hold out a month or two, and just go for a new one. ive got a few road bikes/projects that I will never get round to doing, so I think im gonna sell a couple, and put the money towards a new one...

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Quote

 

well ive seen a couple advertised locally.

one is a base model 2018 for 4300, but when I contacted him, turns out Its sold,..he just never removed the ad.,,,,,,,,,,,bugger

another is a 2016 300rr which is local and has pitched up for 4750. looks clean....very clean …....tempting...

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10 hours ago, monteeman said:

... another is a 2016 300rr which is local and has pitched up for 4750. looks clean....very clean …....tempting...

The first-year (2016) 300RRs had a 2-ring piston. They went back to 3-ring piston in 2017. All 4RTs from 2005 to 2020 except the 2016 300RR have used a 3-ring piston.

Edited by sportsawyer
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And the reason you are telling me this is????

was there a problem with the 2 ring design or something?

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6 hours ago, monteeman said:

And the reason you are telling me this is????

was there a problem with the 2 ring design or something?

yes, they like to drink oil.

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11 hours ago, sportsawyer said:

The first-year (2016) 300RRs had a 2-ring piston.

They went back to 3-ring piston in 2017.

All 4RTs from 2005 to 2020 (except the 2016 300RR) have used a 3-ring piston.

Good info that, thanks

 

 

Edited by johnnyboxer

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I have a 2006 4rt I have had from new , it has never let me down, and even after buying a few more trialers , modern Twinshock and prefer 65, I could never bring myself to let it go, I have just returned to competition after a couple of years, and decided to get the "Lifeboat" out of the shed and tart it up....not bad for a 14 year old Trials bike .

IMG_20180531_112414.jpg

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yes it brushes up well, doesn't look like its done much. 

 

Do we know if the later 2018 300rr 3 ring piston can be retro fitted to an earlier 300rr, to solve the oil use issue,  just out of interest?

I don't suppose they would have made any other bore or stroke changes, but I could be wrong...anyone know?

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51 minutes ago, monteeman said:

... Do we know if the later 2018 300rr 3 ring piston can be retro fitted to an earlier 300rr, to solve the oil use issue,  just out of interest?

Along with the piston / ring set changing in 2017, the cylinder and left center case also changed. I don't know exactly why each changed. But I'd want to find out what was changed in the cylinder before using a 2017 piston / ring set in a 2016 cylinder. It could be related to side cutouts on the bottom of cylinder, and the oil ring being lower on the 3-ring piston. And if the new cylinder is needed for the new piston, is the new left center case needed for the new cylinder?

Part Numbers 2016 --> 2017 --> 2018

Piston:  13101-NN4-L60 --> 13101-NN4-M60 --> Same

Ring Set:  13011-NN4-L60 --> 13011-NN4-M60 --> 13011-NN4-N60

Cylinder:  12100-NN4-L60 --> 12100-NN4-M60 --> Same

Left Center Case:  11200-NN4-L60 --> 11200-NN4-M60 --> Same

Edited by sportsawyer
Added 2018 P.N. changes.
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37 minutes ago, monteeman said:

yes it brushes up well, doesn't look like its done much

Ha , only about 150 club trials, Four full seasons of comps , and been my spare  bike/lender for ten years after that, I have actually worn through the heat shield ....and straightened the second bash plate many times 

Just Honda build quality...

 

IMG_20200115_204552.jpg

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1 hour ago, sportsawyer said:

Along with the piston / ring set changing in 2017, the cylinder and left center case also changed. I don't know exactly why each changed. But I'd want to find out what was changed in the cylinder before using a 2017 piston / ring set in a 2016 cylinder. It could be related to side cutouts on the bottom of cylinder, and the oil ring being lower on the 3-ring piston. And if the new cylinder is needed for the new piston, is the new left center case needed for the new cylinder?

Part Numbers 2016 --> 2017 --> 2018

Piston:  13101-NN4-L60 --> 13101-NN4-M60 --> Same

Ring Set:  13011-NN4-L60 --> 13011-NN4-M60 --> 13011-NN4-N60

Cylinder:  12100-NN4-L60 --> 12100-NN4-M60 --> Same

Left Center Case:  11200-NN4-L60 --> 11200-NN4-M60 --> Same

didn't realise rings change 2017 to 2018  - interesting

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