CB750 scrambler project
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@Louis-DT-WR my thirst for knowledge has got the better of me I've just done a bit of googling and apparently it's only four strokes have 2 cables because the extra vacuum created by a 4 stroke can cause the throttle slide to flutter and jam against the side of the body. That seems to me the most logical explanation so far.
wrote on 27 Feb 2020, 18:29 last edited by@markus-w possible. The other thing with this engine is why does it have 2 oil fillers caps
️ 1 says (don't open) but that's the sprocket side.
In some pictures I see that's where the dipstick is on some bikes. My dipsticks on the clutch cover side like most bikes.Haynes don't do a cbx750 manual.
Just going to persist working through all the small bits. -
@markus-w possible. The other thing with this engine is why does it have 2 oil fillers caps
️ 1 says (don't open) but that's the sprocket side.
In some pictures I see that's where the dipstick is on some bikes. My dipsticks on the clutch cover side like most bikes.Haynes don't do a cbx750 manual.
Just going to persist working through all the small bits.wrote on 18 Mar 2020, 20:19 last edited bySo the carbs were very similar but not correct.
So I started again
parts are taking so long to come from overseas
All new float bowl gaskets, diaphragms, o-rings and rejetted.
Powder coated partsStainless steel Allen cap bolts
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wrote on 20 Mar 2020, 18:05 last edited by
Too many strokes in that engine
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wrote on 20 Mar 2020, 19:44 last edited by
@Darty yes but 4 cylinders is a nice compensation
I've got a name for her.... "Lucille"
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wrote on 20 Mar 2020, 22:45 last edited by
I mean, yeah I agree two many strokes.
But doesn't stop this being a really interesting and cool build.
Loving it pal, keep it up!
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I mean, yeah I agree two many strokes.
But doesn't stop this being a really interesting and cool build.
Loving it pal, keep it up!
wrote on 21 Mar 2020, 21:43 last edited by@Calum cheers man, will keep posting when I get some big progress, stupid Chinese virus is holding up my parts
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wrote on 25 Mar 2020, 15:19 last edited by
Finally my bar clamps came, 3 weeks.
I've got the controls, grip, master cylinders on. Front brake operational.
Choke and throttle cables.
Front headlight on the number board (not finished yet) more to add to it.Pro taper contour bars.
Rear fender (when pulled out, it's a shovel! (Entrenching tool))
Slowly making progress.
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Finally my bar clamps came, 3 weeks.
I've got the controls, grip, master cylinders on. Front brake operational.
Choke and throttle cables.
Front headlight on the number board (not finished yet) more to add to it.Pro taper contour bars.
Rear fender (when pulled out, it's a shovel! (Entrenching tool))
Slowly making progress.
wrote on 25 Mar 2020, 19:32 last edited by@Louis-DT-WR i like the shovel rear fender adds character
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wrote on 29 Mar 2020, 02:11 last edited by
Been driving me crazy how the seller of the engine said it was from a cb750 but appears to be a cbx750 engine (much older + hydraulic clutch) rc17/17E
But the engine apparently had only done 12k
Also looks very new for something that would be 40 years old nearly.After a lot of research the Japanese did a later 2007 LTD with the Rc17E engine when looking at the part numbers for the upper crankcase on this models parts diagram it confirms this.
This is a super rare models engine, + hydraulic clutch optional extra. On an import!But it will work perfectly for me, just ordered the correct pulse generator.
Writing this down for future reference because I'll forget. -
wrote on 2 Apr 2020, 14:30 last edited by
Started on the looming and electrics.
Repositioned the coils to clear the fuel tank.
Little jobs like that take a lot of time getting right.My holster on the headlight number board is all part of the walking dead style bike. It definitely wouldn't be ridden with that on it
even though I'm trained on glocks , this is just a replica.
Only used for pics
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Started on the looming and electrics.
Repositioned the coils to clear the fuel tank.
Little jobs like that take a lot of time getting right.My holster on the headlight number board is all part of the walking dead style bike. It definitely wouldn't be ridden with that on it
even though I'm trained on glocks , this is just a replica.
Only used for picswrote on 4 Apr 2020, 12:04 last edited by@Louis-DT-WR this looks amazing, well done
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@Louis-DT-WR this looks amazing, well done
wrote on 4 Apr 2020, 16:49 last edited by@rolz82 thank you, working through all the electrics. My least favourite thing
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wrote on 4 Apr 2020, 19:04 last edited by
Wow, this looks gnarly as fuck!
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wrote on 15 Apr 2020, 11:35 last edited by
Working through the electrics. I've got my rear indicators and tail lights sorted.
I made a CDI holder to relocate it.
Fuse box and indicator regular relocated.
Front lights, indicators and horn on.
Ignition barrel relocation plate made.
Just sorting a battery box and the battery is on order. I can't fully test what connector goes where until the battery comes.
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wrote on 22 Apr 2020, 14:53 last edited by
Well I put the engine in alone which was a very heavy task
killed my back haha. Lining it up with the mounts while the bike was leaning again the bench. (You can't fit the engine when the chassis is on a bike lift)Got my battery box mounted with the lithium battery. Its so light! I thought it was just a empty case!
Carbs on + filters and cables. Fitting the carbs was tricky, the rubber manifolds are so hard. I'd replace them but £150+vat for 4 and they're not cracked.
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Well I put the engine in alone which was a very heavy task
killed my back haha. Lining it up with the mounts while the bike was leaning again the bench. (You can't fit the engine when the chassis is on a bike lift)Got my battery box mounted with the lithium battery. Its so light! I thought it was just a empty case!
Carbs on + filters and cables. Fitting the carbs was tricky, the rubber manifolds are so hard. I'd replace them but £150+vat for 4 and they're not cracked.
wrote on 22 Apr 2020, 14:55 last edited byI even have a engine lift but it would have needed an offset cradle made up to clear the frame
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wrote on 22 Apr 2020, 14:58 last edited by
That does look smart as f to be fair!
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wrote on 22 Apr 2020, 15:15 last edited by
@Calum cheers man. Its literally a case of getting parts in my hands and making it fit/fabricate parts. I wish fowler's would hurry up, waiting ages for my rear brake parts. And side stand bits
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wrote on 24 Apr 2020, 17:39 last edited by
Little bits done, oil cooler fully connected, the pipes were bent, took a while to get them right.
Oil filter came finally.
PCV filters on.
Started seat mounts and ignition switch relocation.The 2 most expensive items I need is an exhaust and starter motor.
Still undecided what tank colour. I'm thinking Matt gunmetal grey. I was going to go black but think that would be over kill.
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Little bits done, oil cooler fully connected, the pipes were bent, took a while to get them right.
Oil filter came finally.
PCV filters on.
Started seat mounts and ignition switch relocation.The 2 most expensive items I need is an exhaust and starter motor.
Still undecided what tank colour. I'm thinking Matt gunmetal grey. I was going to go black but think that would be over kill.
wrote on 24 Apr 2020, 20:27 last edited by@Louis-DT-WR match your tank to the cam covers maybe
