Honda H100 SII - First bike, First project

[HDot]

Hello DTT!

Over the summer I decided that I wanted to get a motorbike because it would be cheaper than a car particularly as a 19 year old student. I also wanted something I could tinker with. I am a world class procrastinator and finally took my CBT in mid October. I had every intention to get a running or almost running four stroke 125 as that is the most I can legally ride in England with a CBT. A 125 is probably for the best anyway as I would likely end up in someone's dining room or wrapped around a tree if I had any more power. After browsing eBay and Gumtree for countless hours my heart was set on a H100 SII that I saw. It is a two stroke rather than 4, sorry environment, and hopefully a bit faster than any 4 stroke equivalents. The bike doesn't quite qualify for the "running or almost running" criteria however. But I had my heart set on the thing and the seller was happy to deliver it so that was a fairly helpful selling point.

Anyway, enough of the back story. I got a new battery and gave it a few kicks. Nothing. After realising how much of a novice I was I turned the fuel on. After cleaning the carb and kicking it a lot more I did get it to run but the throttle stuck at about 5000 rpm so I quickly turned it off. Me and a roommate subsequently started it another three times that evening. I got a NOS throttle cable but the throttle still sticks.

The throttle sticking is currently a non issue though as it takes about 20 kicks and a bit of prayer to get it to start. I am very inexperienced but my ideas are that its something in the carb? I say this because when I dismantled it the float needle seems to be a little worn as the floats don't sit exactly as it shows they should in the Haynes Manual. The slide also seems to have lost some of its coating. Could this be causing the sticky throttle? Anyway. Pictures

The day I got it. It was a horrible day so I hid it inside amongst the boxes.

My "workshop." The roommates were fine with me using the spare room downstairs.

Different view. Lacking a few more components.

And the damage to the slide???

I haven't quite figured out what I want to do once I get this thing moving reliably. Some of the chrome is in incredible condition which lends itself to a full restoration. However I don't have big cash to sink into something like that and I'm not sure that the return will be...well...anything ;D. Its very tempting to modify it as I think with some stripping down and swapping parts I could make it weigh the same dry as I do!

Thanks for looking and I apologise if I have made any seriously novice like mistakes. I don't know what you guys think of Hayne's Manuals here? I have received a lot of criticism for just mentioning it. Its not even that useful ;D.

 

[DohcBikes]

The damage to the slide is likely the cause of your sticky throttle.

The slide bore is probably not that great either.

For all intents and purposes the next practical step is to search for an entire carb that is in good condition.

Welcome to DTT, I really like that little bike!

 

[VonYinzer]

You should be able to find a brand new replacement carb for it. Do that.

As a 19 year old college student with limited funds and knowledge I would suggest getting it running great and leaving it alone. Ride the piss out of it through school. Keep it clean and running well, all the while learning the ins and outs of motorcycle ownership and maintenance.

The chick's will dig it, your buddies will dig it, etc...

Welcome to DTT and good luck!

 

[HDot]

Ok. Thanks for the suggestions. Would you both confidently say that the carb is what is causing the problems starting it? Is there any way I can temporarily fix it to verify that is the problem before I sink money into a new carb. As far as a new carb is concerned can I get a similarly specced carb as a replacement as I don't think I will be finding many of these carbs knocking around.

I do like the idea of just using it as a run around and getting familiar with maintaining and running a bike but I like to be ambitious and I don't require transport for anything so if this spends half its time off the road it won't be a huge issue. I also have access to the universities workshop facilities. I will see if I can get I'm running first. ;D

 

[Tranmeresocks]

Hello mate,

I just read your post and it all sounded familiar.

I bought my h100 when I was 20, 5 years ago.

There's a thread on it here http://www.bikechatforums.com/viewtopic.php?t=235760

There's a screw on the near side of the carb (forgot its name) that if you turn anti clock wise may solve your rev issue.

You may find new carb parts but I've never seen a complete new carb on the net.

Let me know if you need any help.

Here's mine before and after

All the best


Sent from my iPhone using Tapatalk

 

[HDot]

Hey Tranmeresocks

Thanks for the reply. I have been fiddling with the bike over the past few weeks and talking to various lecturers and technicians at university as some of them also fiddle with bikes in their free time and have a lot more experience than me. I have got the bike to start reliably now which is great. I cleaned the fuel tank, got a new fuel line, cleaned the carb, new spark plug, new spark plug connector and a new throttle cable and grip.

I have just built a new seatpan and "ghettoed" up some foam and old vinyl. I'm sure you will all cringe at the sight but the previous seat was falling apart and there wasn't much left of the seat pan. I have managed to ride it up and down the road but need to clean the fuel tank properly because it still has spots of rust in it.

Thanks for the interest. I guess I am in a similar position to how you were 5 years ago. I will try and get some good pictures up here later. Sorry for the wall of text