1985 honda cr125

DVP16
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DVP16
Edited Date/Time 5/2/2021 7:13am
Have been working on this machine for about a year in my spare time. Plan to have it running in just a few weeks, just waiting on a couple last pieces. Building it how i like it, but also trying to keep it somewhat old school/original. I Have been the owner of this bike since roughly 1999, but it has been in pieces since 2005 or so. Can wait to rip it once again!!

Ive done everything myself with the exception of:
- Crank - crankworks, new rod, true, weld tin can
- Cylinder - cvtechAAB, sleeve cylinder std bore.
Good work done by both.
- Powder coat frame/subframe - couldnt fit in my oven. I realize color is far off, too bright/fluorescent, may have redone oneday later on.

Products i was impressed with:
- Venhill for front brake hose, good price, nice build, custom hoses, perfect fit.
- Vintage roost for seat cover, fit perfectly.
- Haan wheels sent me excels and spoke sets which laced up perfectly as well.

Many others were a make fit install, but decent, not many options
Hotfootmoto-chain guides etc
Plastics-maier
Rads-gpi
Rad louvers-made rm125 ones to fit. Originals are non existent.

























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JMX82
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JMX82 3/29/2021 9:53pm
3/29/2021 9:53pm
Great build! These old Honda's are great bikes. How bad was the infamous magnesium rot in water pump cavity?
DVP16
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DVP16 3/30/2021 3:50am
3/30/2021 3:50am
Water pump hsg was not actually bad at all, small amount of pitting. Minimal. Dont think it really ran too much, been in boxes for 16 years, even before that it never ran much, used to blow it up on a regular basis when i was a kid, lol, did find many issues that were causing that, hopefully will run better in its 2nd life!
DVP16
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DVP16 3/30/2021 3:51am
3/30/2021 3:51am
Do have many pictures in old phone of initial stages of build, etc will add when i get chance to
JMX82
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JMX82 3/30/2021 4:07am
3/30/2021 4:07am
DVP16 wrote:
Water pump hsg was not actually bad at all, small amount of pitting. Minimal. Dont think it really ran too much, been in boxes for 16...
Water pump hsg was not actually bad at all, small amount of pitting. Minimal. Dont think it really ran too much, been in boxes for 16 years, even before that it never ran much, used to blow it up on a regular basis when i was a kid, lol, did find many issues that were causing that, hopefully will run better in its 2nd life!
I recommend you to use waterless coolant to prevent the magnesium rot. That is the biggest problem with these bikes and aftermarket aluminum replacement clutch covers are quite expensive

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DVP16
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DVP16 3/30/2021 4:38am
3/30/2021 4:38am
Yes. Have heard that, however i understand engine will run slightly hotter due to this, not sure i like that.
Was going to run silica phosphate free stuff.
sandman768
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sandman768 3/30/2021 6:09am
3/30/2021 6:09am
I run the evans in my older bikes, I don’t notice them running hotter than normal antifreeze, they may even run cooler.
DVP16
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DVP16 3/30/2021 3:39pm
3/30/2021 3:39pm
Evans claims on their website that their coolant generally runs 10-20 degrees hotter, they say this is due to there being no vapor in the system, due to no water, and you get 100% liquid to metal contact all the time. Basically they say it draws more heat from the engine. Coolant will be hotter, engine components cooler. So they say...
Not sure whats in this stuff but i do know water is what cools my engine, not coolant.
I understand it is less corrosive etc, but not convinced on their other claims.
Maybe i will run reg coolant and distilled water at first, check temp, then try it. Compare. Will see
JMX82
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JMX82 3/30/2021 9:52pm
3/30/2021 9:52pm Edited Date/Time 3/30/2021 10:06pm
DVP16 wrote:
Evans claims on their website that their coolant generally runs 10-20 degrees hotter, they say this is due to there being no vapor in the system...
Evans claims on their website that their coolant generally runs 10-20 degrees hotter, they say this is due to there being no vapor in the system, due to no water, and you get 100% liquid to metal contact all the time. Basically they say it draws more heat from the engine. Coolant will be hotter, engine components cooler. So they say...
Not sure whats in this stuff but i do know water is what cools my engine, not coolant.
I understand it is less corrosive etc, but not convinced on their other claims.
Maybe i will run reg coolant and distilled water at first, check temp, then try it. Compare. Will see
Do not run regular coolant unless you drain your coolant system after every ride. If you don't do that your water pump will end up looking like this and radiators will be clogged with magnesium residue. It will have much bigger effect on your coolant system efficiency than running waterless coolant





At least you have been warned...

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DVP16
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DVP16 3/31/2021 4:07am
3/31/2021 4:07am
DVP16 wrote:
Evans claims on their website that their coolant generally runs 10-20 degrees hotter, they say this is due to there being no vapor in the system...
Evans claims on their website that their coolant generally runs 10-20 degrees hotter, they say this is due to there being no vapor in the system, due to no water, and you get 100% liquid to metal contact all the time. Basically they say it draws more heat from the engine. Coolant will be hotter, engine components cooler. So they say...
Not sure whats in this stuff but i do know water is what cools my engine, not coolant.
I understand it is less corrosive etc, but not convinced on their other claims.
Maybe i will run reg coolant and distilled water at first, check temp, then try it. Compare. Will see
JMX82 wrote:
Do not run regular coolant unless you drain your coolant system after every ride. If you don't do that your water pump will end up looking...
Do not run regular coolant unless you drain your coolant system after every ride. If you don't do that your water pump will end up looking like this and radiators will be clogged with magnesium residue. It will have much bigger effect on your coolant system efficiency than running waterless coolant





At least you have been warned...

Thanks for the tip.
I wonder how many of these bikes ran with old school green phosphate/silica coolant mixes with hard tap water. I realize magnesium was a retarded idea but mine had/has minimal corrosion/damage, possible distilled water i always pit in it helped her out a bit.
DVP16
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DVP16 5/1/2021 9:03am
5/1/2021 9:03am
Finally completed 100%.





6
jeffarakbari 1/12/2024 4:52pm
1/12/2024 4:52pm
DVP16 wrote:
Finally completed 100%. [img]https://p.vitalmx.com/photos/forums/2021/05/01/490495/s1200_460E8325_AA94_42AB_AF9E_27570916255D.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2021/05/01/490497/s1200_87FBA7F5_126F_4F2C_A683_1F36215F9D40.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2021/05/01/490500/s1200_AF32A4E5_45C3_4C64_B3FD_35D115071D10.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2021/05/01/490498/s1200_BEC87049_D878_42B9_BB0B_3824836D2043.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2021/05/01/490499/s1200_53EED4D3_83A9_45B7_94CE_24F5297B3D68.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2021/05/01/490496/s1200_102FD475_F7DE_4C36_ACC7_5CF462631D1B.jpg[/img]
Finally completed 100%.





Good job great job I should say. My exhaust system got stolen and I'm looking to bypass the atac system. Any ideas for me? Much obliged. Pro circuit exhaust used to make a system that I believe would work for me but they discontinued.

DVP16
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DVP16 1/13/2024 9:58am
1/13/2024 9:58am

IMG 0256.jpeg?VersionId=np1DloyvIQ6r

 

Thanks

dg pipes, it comes with adapter/block off exhaust flange which eliminates atac system.  Looks like this  

IMG 0257.jpeg?VersionId=GJshi3qnx7roigv

 

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