H100

[_Iain_]

Partially seized the H100 going for a top speed run a few days after I got it. I believe it massively overheated due to a homemade panel filter that hadn't been oiled causing the mix to go slightly lean, and the fact it was running a no.7 plug not an 8.

Finally got around to stripping it last night & sorting it out properly;

https://i.imgur.com/pTuw8Ss.jpg

£20 of piston & gasket set.

https://i.imgur.com/bU57lpJ.jpg

Downpipe off, head off carb unbolted.

https://i.imgur.com/a8mqRAD.jpg

Cylinder off.

https://i.imgur.com/MtbCfQE.jpg

Wasn't too badly scratched, so just gave it a quick hone & cleaned it up.

https://i.imgur.com/oKbNJeU.jpg

Head was a bit shit, so decoked that.

https://i.imgur.com/nl4PjqO.jpg

https://i.imgur.com/WOuPSIi.jpg

Piston however appears to have had a four corner seizure.

Popped new piston in, rebuilt in the reverse of taking it apart making sure to smother the little end bearing,cylinder & piston with two stroke oil. Fired up first kick which was a pleasant surprise! Have filled up the two smoke bottle with some Silkolene Comp 2 Plus - the same stuff we run in the RS125's as I'm hoping running good quality two smoke will bed the thing in properly & give me a longer lasting motor. Everyone likes their winter hack reliable



https://static.fjcdn.com/pictures/cool+story+bro.+aint+a+clue+if+this+already+exists_ff5759_3462961.jpg
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Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[_Iain_]

You're gonna fucking love this

https://i.imgur.com/njgRRaH.jpg

Something or other gave out & ended up getting recovered by the other half.
Need to whip the top end back off, but feels like zero compression & theres fuel/oil round the cylinder base leaving me to think the top end either needs re-torquing down or the base gasket diddnt seal propperly.
____________________
Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[Ballpien]

Natty footwear

[_Iain_]

She was in bed prior to playing recovery truck. Was entertaining driving through Strood McDonalds with the bike hanging out the back.

Ordered new little end bearing, new rings and another top end gasket set today. Hopefully gonna be here tomorrow & i'll try and get the bloody thing stripped this afternoon. Initial inspection flagged up the front RHS head stud was fecking loose. Dont know why, further investigation required & a torque wrench upon reassembly I feel - It'll teach me for rushing though wont it

Edit - the cause for the engine failiure became apparent as soon as i removed the barrel. The LHS circlip had failed, got stuck in the transfer port & smashernated my new piston & rings. Have filed an emergency last minuite order with Grampian's & will rebuild again tomorrow.

https://i.imgur.com/OnjFfOh.jpg

Cylinders not too bad though, the circlip made its way back down the transfer port - quick hone will sort that

https://i.imgur.com/t68uEpr.jpg
____________________
Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[Welshd1k]

care to explain how a circlip fails? i think you didnt re assemble properly without being rude
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

[CHR15]

what clock position were the open ends of the circlip fitted at?
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Turbocharged drag thing / project death weapon / GK73A
Ste: I'm not entirely sure how you'd go about verbally abusing someone with a potato but I'm sure it's possible.

[evoboy]

NEVER seen a circlip 'fail' of its own accord.

Wasn't installed correctly.....epic fail.
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Suzuki GT250 x7------- Fazer 600------CB250RS------Aprilia Rally 70----- Bandit 600

APT Motorcycles

[_Iain_]

[_Iain_]

[CHR15]

thats why then.
____________________
Turbocharged drag thing / project death weapon / GK73A
Ste: I'm not entirely sure how you'd go about verbally abusing someone with a potato but I'm sure it's possible.

[Kickstart]

[bladerunner]

As a point of interest....I had circlips in my RGV race bike start to fail within 300 miles...that's how often I did top end inspection/rebuilds. They didn't pop out as wear out. The gudgen pin was wearing its way thru the clips...oddly ones I'd bought from Grampian that were soft as hell it seems. Caught in time to prevent catastrophic top end failure but score marks were evident where they were starting to break up. Must say I've always trusted Grampian to supply good stuff for years and this may have been a bad batch....but back to oe ones from robinsons foundry after that!
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Current bikes...cbr929, KDX200's, Rd125lc mk2, RGV250's

[_Iain_]

[MattWadz]

Looks like so much fun! regardless of people saying 'buy a bigger bike' it is funny sometimes to screw around with a little 2 stroke!
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Pitbike x2, Mini Moto x4, China Quad, 02' Suzuki AP50 > 03' MBK Nitro > 86' Suzuki GP100 > 02' Yamaha Jog R > 57' Honda Lead 100 > 95' Piaggio ZIP Rst 50 > 51' Suzuki TS50x > 83' Honda CB125TDE Twin > 51' Yamaha Aerox > 98' Kawasaki KX60 > 89' Yamaha DT50MX > 80's Honda QR50 > 05' CG clone > 125cc China Pitbike > 91' Honda MTX125 RW-L > 09' Peugeot Speedfight 2 LC LR > Lucky MX 140cc > Apache Tomahawk 50 Quad (current = 2010 Yamaha WR125R

[Welshd1k]

[P.]

Indeed, 20hp from a H100

[stevo as b4]

[_Iain_]

[_Iain_]

It's running again. Only had the chance to quickly fire it up in the back of the workshop as i've been fiddling with it in 30min sprints whilst the boss sorts out paperwork upstairs. Honed the shit out of the barrel, but theres still some major scoring in there. I think it'll munch rings quickly & not make optimal compression, but it's enough to start so time will tell.

Two deaded pistons;

https://i.imgur.com/gksv647.jpg

And my first attempt at two stroke porting. I've attempted to increase the width of the exhaust port above the height of the transfer ports in the hope that it'll not blow loads of fresh air fuel mix straight out of the port. I've also raised the port height slightly & smoothed out a lot of the casting marks. Diddnt want to go too nuts first time out & feel that a munched cylinder is the ideal thing to play about with.

https://i.imgur.com/9Dsd1aF.jpg

Purple liquid is two stroke oil I smothered the bore & piston in for re-assembly
____________________
Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[MattWadz]

#SICK #RAD #GNAR
____________________
Pitbike x2, Mini Moto x4, China Quad, 02' Suzuki AP50 > 03' MBK Nitro > 86' Suzuki GP100 > 02' Yamaha Jog R > 57' Honda Lead 100 > 95' Piaggio ZIP Rst 50 > 51' Suzuki TS50x > 83' Honda CB125TDE Twin > 51' Yamaha Aerox > 98' Kawasaki KX60 > 89' Yamaha DT50MX > 80's Honda QR50 > 05' CG clone > 125cc China Pitbike > 91' Honda MTX125 RW-L > 09' Peugeot Speedfight 2 LC LR > Lucky MX 140cc > Apache Tomahawk 50 Quad (current = 2010 Yamaha WR125R

[P.]

[chris-red]

[P.]

[MattWadz]

#WASJOKINM8DONTMOUFTOMEORIWILLBASHYERFOOKINEDDIN

haha as if i would genuinely use a # in my vocabulary!
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Pitbike x2, Mini Moto x4, China Quad, 02' Suzuki AP50 > 03' MBK Nitro > 86' Suzuki GP100 > 02' Yamaha Jog R > 57' Honda Lead 100 > 95' Piaggio ZIP Rst 50 > 51' Suzuki TS50x > 83' Honda CB125TDE Twin > 51' Yamaha Aerox > 98' Kawasaki KX60 > 89' Yamaha DT50MX > 80's Honda QR50 > 05' CG clone > 125cc China Pitbike > 91' Honda MTX125 RW-L > 09' Peugeot Speedfight 2 LC LR > Lucky MX 140cc > Apache Tomahawk 50 Quad (current = 2010 Yamaha WR125R

[_Iain_]

Despite JT sprockets claiming they dont make anything bigger to alter the gearing of the H100 I've been looking some specs over.

Figured an MB80 sprocket would probbably fit if i used the retainer plate too. Its damn close on the cases..

https://i.imgur.com/ejFb4t3.jpg

2X AP8152040 - HEX SOCKET SCREW M6X20 £0.22
2X 8152184 - WASHER 6.4X12 £0.62
1X 726.04.82 (Larsson's number) JTF253-17 (JT part number) - SPROCKET 17T 420 PITCH £3.64
1X 726.33.20 (Larsson's number) - FRONT SPROCKET LOCK PLATE £2.04

Total: £6.52 - Tried, tested & workable. Think that plus the 90/90/18 rear puts the gearing about as high as you'll get on one of theese. This setup allows for 73.4mph @ 8,000rpm, however unsure if the engine will actually get that far unless going downhill.
____________________
Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340