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  #121  
Old 01-05-2018, 07:47 AM
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Quote:
Originally Posted by landuse View Post
We aren't going anywhere
Wasnt sure if anyone was following still , but
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  #122  
Old 01-11-2018, 02:24 PM
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I find it ironic that i can get an old 30+ year old moto-cultivator to run like new , and a puny go kart engine is kicking my rear ....


Slightly off topic , but just to prove i do have a bit of knowledge
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  #123  
Old 02-03-2018, 09:29 AM
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Progress .. or regress ?

Welded on the EGT probe , not the best of welds but it does the trick .

And after so much hassle , i went ahead and machined my own rotor puller .

Rotor went off , and so did my happy face . Crankshaft and key are ok , keyway in rotor is fubar.
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  #124  
Old 02-04-2018, 06:37 AM
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So far , dead end unless i can find the rotor ... which so far isnt proving to be "search and click buy"

Any ideas / advice if repairing this rotor is possible ?
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  #125  
Old 02-04-2018, 09:02 AM
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Both of these online shops offer international shipping:
https://www.marmaxkartsandparts.com/...ignition-rotor
http://www.out2win.com/catalog/yamign.html
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  #126  
Old 02-04-2018, 09:22 AM
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Thats the issue .. those dont have a cutaway for the starter ring .. and im not sure how would they react to machining
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  #127  
Old 02-09-2018, 01:21 PM
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Well , got some time tomorrow , il try to do a proper job documenting it all.

Tearing the engine open (again) , and do the whole checkup (again) from the bottom up .

*sigh*
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  #128  
Old 02-10-2018, 10:39 AM
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Pics.
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  #129  
Old 02-10-2018, 12:44 PM
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I would chamfer the cylinder liner leading into the transfer ports and taper the leading edge of the transfer port dividers.
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  #130  
Old 02-10-2018, 12:46 PM
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By chamfer you mean , rounding the liner towards the transfer port openings ?
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  #131  
Old 02-10-2018, 12:52 PM
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Quote:
Originally Posted by NewbCarter View Post
By chamfer you mean , rounding the liner towards the rransfer port openings ?
Correct.

---------- Post added at 11:52 AM ---------- Previous post was at 11:46 AM ----------

You can use round file to radius and chamfer the liner and the dividers that it how I do it and it is easy to blend the transition in those areas.
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  #132  
Old 02-10-2018, 01:28 PM
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Look at the difference of the transfer port dividers and the cylinder liner where it transitions into the transfer ports.
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  #133  
Old 02-11-2018, 06:17 AM
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Probably will do that when i get time ...

In the meantime , i have found some interesting stuff
1) My head gasket is 0,4mm , and my cylinder base gasket is 0,7mm . I have not found (online) either one that match what i have . Either the head gasket is alot thicker ( copper , 1mm) or the cylinder base gasket is alot thinner ( 0,45mm) ..

2) I will need new crankcase seals .
3) There is a small chance i have found a PVL module that could fit my engine , for a low price .
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  #134  
Old 04-07-2018, 11:02 AM
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Exhaust touchup
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  #135  
Old 04-28-2018, 08:48 AM
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Shiny.
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  #136  
Old 07-21-2018, 07:27 AM
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  #137  
Old 08-24-2018, 01:13 PM
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Sorry for no updates , college is killing me.
Luckily i got some time in today , and took measurement oof the crankcase seals , and clutch seals.

The crankcase bearings are ok , the clutch bearing is ok but the copper bushing in the clutch could use some care . Probably be best to replace it .
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  #138  
Old 02-12-2019, 08:19 AM
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Welp , finally got around to working on the Rondo again , but i brought in a extra pair of hands .

To shorten it up :
-KT100 yamaha is gone
-Hello TG14 Parilla
-Hello complete 25mm axle
-Hello new vega semi-soft slicks

Link :
And a pic of the fully checked and assmebled engine
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  #139  
Old 02-15-2019, 10:10 AM
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Checking the timing of the ports in the engine ( duration ) .

Cleaned up the piston and the cylinder head . 48,3mm on the piston , which gives around 91,6cc , so plenty of life left .
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  #140  
Old 02-17-2019, 09:05 AM
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Welp , playing around with the software that mr. Desertduler reccomended , and i keep getting ( to my knowledge ) weird results .

The stock exhaust is somewhere around 60-75cm long and is the "stock" exhaust where this engine is supposed to be used ( Formula 100 classes , Pre 90s , etc ).

I double checked the port timings , and all the measurements , and for a peak HP of 25 @ 18000 RPM , i get an exhaust that is very short ( 455-497mm ) with a stage three diffuser , tuned for as wide of a powerband one could get .

Im pretty sure im doing something wrong . Port durations are as follows :
Intake : 140 degrees
Exhaust : 165 degrees
Primary transfer ports : 128 degrees
Boost port : 125 degrees
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